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Percentage, date, salary, BMI, tip, and age calculators. Fast and private.
Calculate percentages, percentage change, and percentage of a number.
Calculate the difference between dates, add or subtract days.
Convert salary between hourly, daily, weekly, biweekly, monthly, and yearly amounts.
Calculate your Body Mass Index and see your weight category.
Calculate tips and split bills between multiple people.
Calculate exact age in years, months, and days from a birth date.
Focus timer with Pomodoro technique, session tracking, and sound notifications.
Full scientific calculator with arithmetic, trigonometry, logarithms, and calculation history. Keyboard support.
Convert between 30+ world currencies with a swap button and live conversion. Rates are approximate.
Calculate monthly payments, total interest, and view an amortization table for any loan.
Calculate mortgage payments with property tax, insurance, and down payment. Full monthly breakdown.
Calculate final price after discount or find the discount percentage from original and final prices.
Calculate width or height for any aspect ratio. Common presets for 16:9, 4:3, 1:1, 21:9, 9:16.
Precise stopwatch with start, stop, reset, and lap times. Millisecond accuracy. Keyboard support.
Set a countdown timer with audio alert. Quick presets for 1, 5, 10, 15, 30, and 60 minutes.
View current time in cities worldwide. Add, remove, and search timezones with live updates.
Set alarms with audio alerts and snooze. Support for multiple alarms running simultaneously.
Calculate daily calorie needs using Mifflin-St Jeor BMR formula. Input age, gender, height, weight, activity level.
Estimate CO2 emissions from flights, car travel, and home energy. See total footprint and tips to reduce.
Calculate compound interest with principal, rate, time, and compounding frequency. Year-by-year breakdown.
Calculate savings growth with monthly deposits, interest rate, and years. Visual growth chart.
Calculate income tax owed, effective rate, and take-home pay for US, UK, and FR tax brackets.
Track expenses by category and date. Monthly totals, category summary, and CSV export. Auto-saved locally.
Calculate return on investment, net profit, and payback period from investment cost and return value.
Random arithmetic problems with difficulty levels. Timer, score tracking, and streak counter.
Interactive multiplication grid 1-12 with hover highlights. Practice mode with random questions.
Pick which multiplication tables to practice (1-12). Timed quiz with score, streak, and wrong-answer review.
Interactive unit circle showing angles in degrees/radians with sin, cos, tan values. Click any angle to highlight.
Random binary numbers to convert to decimal. Timer, score, and difficulty levels (4-bit, 8-bit, 16-bit).
Calculate recommended daily water intake based on weight, activity level, and climate. Track glasses today.
Find optimal bedtimes or wake-up times based on 90-minute sleep cycles. Get 4, 5, or 6 full cycles.
Enter your birthday and see your exact age in years, months, days, hours, minutes, seconds — live updating.
Set a future date and see a live countdown in days, hours, minutes, seconds. Presets for holidays.
Convert your pet's age to human years based on species and breed size. Shows life stage information.
Add or remove VAT from any price. Supports 20+ countries with correct rates. Net to Gross and Gross to Net.
Calculate sales tax for all 50 US states. Enter price, select state, get total with tax breakdown.
Calculez la TVA en France : taux normal 20%, intermédiaire 10%, réduit 5.5%, super-réduit 2.1%. HT vers TTC et TTC vers HT.
Calculate UK income tax with 2025/2026 bands. Personal allowance, basic, higher, additional rate, and National Insurance.
Calculate your ideal hourly and daily rate based on target income, expenses, holidays, and working hours.
Calculate gross margin, markup percentage, and profit from cost and selling price. Or find the selling price from target margin.
Estimate your net paycheck after federal tax, state tax, Social Security, and Medicare deductions.
Calculate invoice totals with multiple line items, tax rates, and discounts. Multi-tax support for GST, PST, and more.
Convert between L/100km, MPG (US), MPG (UK), and km/L. Bidirectional fuel economy conversion.
Complete paper size reference: A0-A10, B0-B10, Letter, Legal, Tabloid. Dimensions in mm, cm, inches, and pixels at various DPI.
Convert between Pa, kPa, bar, atm, psi, mmHg, and torr. Bidirectional pressure unit conversion.
Convert between Joules, kJ, calories, kcal, kWh, BTU, and eV. Bidirectional energy unit conversion.
Convert between degrees, radians, gradians, turns, arc minutes, and arc seconds.
Convert between square meters, square kilometers, hectares, acres, square feet, square yards, and square miles.
Convert between mL, L, gallons (US/UK), quarts, pints, cups, fluid ounces, and cubic meters.
Estimate shipping costs based on package dimensions and weight. Compare carrier rates.
Calculate net profit, margin, and ROI with marketplace fee presets for Amazon, eBay, Shopify, Etsy.
Compare prices per unit across products to find the best value. Auto-ranking.
Calculate electricity cost for any appliance. Watts, hours, price per kWh. Common presets.
Calculate your ideal weight range using Hamwi, Devine, Robinson, and Miller formulas based on height and gender.
Estimate your due date, current week, trimester, and key milestones from your last menstrual period or conception date.
Calculate your max heart rate and 5 training zones: Recovery, Fat Burn, Cardio, Hard, and Max based on your age.
Interactive blood type compatibility chart. See who you can donate to and receive from, including Rh factor.
Log meals with calories and macros. Track daily intake against your goal. Saved locally in your browser.
Calculate straight-line distance between two coordinates using the Haversine formula. Results in km and miles.
Select two timezones to see current time in each and the difference in hours, accounting for DST.
Estimate flight time between two cities based on distance and average cruising speed.
Plan your travel budget: see local currency equivalent, tipping customs, and average costs for meals, transport, and hotels.
Calculate mean, median, mode, range, variance, standard deviation, quartiles, and more from a set of numbers.
Add, subtract, multiply matrices. Compute determinant, transpose, and inverse for matrices up to 4x4.
Solve quadratic equations (ax² + bx + c = 0). Get real or complex roots, discriminant, vertex, and axis of symmetry.
Add, subtract, multiply, and divide fractions. Simplify results and convert to mixed numbers.
Find the Greatest Common Divisor and Least Common Multiple of two or more numbers using the Euclidean algorithm.
Compare renting vs buying a home. See break-even year and 30-year total cost for both scenarios.
Calculate annual ROI, cash-on-cash return, and cap rate for rental property investments.
Calculate stamp duty or property transfer tax for UK, Australia, and Singapore with current rate bands.
Estimate your moving costs based on distance, number of rooms, and extra services like packing and piano moving.
Calculate the exact age difference between two people in years, months, and days.
Find your day of birth, zodiac sign, Chinese zodiac, birthstone, and birth flower.
Calculate your GPA on a 4.0 scale. Add courses with credits and grades.
Calculate weighted grades and find what score you need on the final.
Split bills with custom tip percentages and per-person breakdown.
Add multiple time durations together. Perfect for timesheets and project tracking.
Calculate weekly work hours with overtime, breaks, and estimated pay.
Calculate paint needed for a room accounting for doors, windows, and coats.
Calculate tiles needed for a floor or wall with wastage and grout estimates.
Calculate concrete volume for slabs, footings, and columns with bag counts.
Calculate wallpaper rolls needed for any room with waste percentage.
Calculate flooring materials needed for wood planks, tiles, carpet, or vinyl.
Calculate fabric needed for curtains based on window size and style.
Calculate fence posts, rails, and boards needed for any perimeter.
Calculate grass seed needed for new lawn, overseeding, or repair.
Calculate mulch volume in cubic yards and bags needed.
Running pace calculator with split times for any distance.
Estimate one-rep max using Brzycki, Epley, and more formulas.
Estimate body fat percentage using the US Navy method.
Calculate daily protein, carbs, and fat from calorie target and goal.
Convert steps walked to distance based on height and stride length.
Calculate calories burned for 30+ activities by duration and weight.
Calculate break-even point in units and revenue with price sensitivity.
Calculate startup runway from cash, expenses, and revenue.
Calculate Monthly Recurring Revenue with plans, churn, and ARR.
Calculate customer lifetime value from ARPU, churn, and margin.
Calculate customer acquisition cost from marketing and sales spend.
Estimate startup valuation using revenue multiples by business type.
Scale recipe ingredients proportionally to any serving size.
Convert baking measurements between cups, grams, and ounces by ingredient.
Calculate coffee-to-water ratios for 8 brewing methods.
Calculate pizza dough ingredients by style: Neapolitan, NY, Detroit.
Estimate blood alcohol content from drinks, weight, and time.
Tipping customs for 30 countries covering restaurants, taxis, and hotels.
Calculate recommended wire gauge (AWG) based on current, distance, and voltage drop. Reference table included.
Calculate the right resistor value for LEDs. Enter forward voltage, current, and supply voltage for series or parallel configs.
Calculate total capacitance for series and parallel capacitors. Also compute energy stored in a capacitor.
Decode resistor color bands to resistance value or encode a value to color bands. 4 and 5 band support with visual display.
Calculate total power draw for your PC build and get PSU wattage recommendation. Add CPU, GPU, RAM, drives, and fans.
Calculate how many plants fit in your garden bed based on square footage and plant spacing. Grid preview with common plants database.
Calculate how much soil you need for raised beds. Enter dimensions to get volume in cubic yards/meters and bags needed.
Estimate how much rainwater you can collect based on roof area and annual rainfall. Tank size recommendation included.
Calculate approximate daylight hours and sunrise/sunset times by latitude and month. Annual daylight chart.
Calculate your compost carbon-to-nitrogen ratio. Add green and brown materials to check if your mix is in the optimal range.
Estimate crypto mining profitability. Enter hash rate, power consumption, and electricity cost for daily/monthly profit.
Calculate Ethereum transaction fees. Gas limit × gas price in Gwei. Common gas limits for transfers, swaps, and mints.
Check if a number is prime. See its factors, prime factorization, and nearby primes.
Generate Fibonacci numbers or check if a number belongs to the Fibonacci sequence.
Calculate factorials up to 1000! using BigInt. Shows steps and digit count.
Calculate nPr permutations and nCr combinations with formula display.
Calculate any side of a right triangle using the Pythagorean theorem. Visual triangle display.
Calculate golden ratio pairs. Visual spiral and rectangle display.
Calculate square footage from length and width. Add multiple rooms. Metric option.
Calculate cubic footage from L x W x H. Volume for shipping, storage, concrete.
Input radius, diameter, circumference, or area — calculate all others. Visual circle.
Calculate triangle area, perimeter, angles, and type from sides and angles.
Calculate cylinder volume, surface area, and lateral area from radius and height.
Calculate sphere volume, surface area, diameter, and circumference from radius.
Calculate cone volume, surface area, and slant height from radius and height.
Calculate trapezoid area, perimeter, and median from parallel sides and height.
Calculate regular hexagon area, perimeter, apothem, and diagonal from side length.
Calculate ellipse area, circumference, eccentricity from semi-major and semi-minor axes.
Calculate Compound Annual Growth Rate from start value, end value, and number of years.
Calculate future or past purchasing power based on inflation rate and years.
Estimate retirement fund based on age, savings, monthly contributions, and return rate.
Calculate how long to pay off debt and total interest from balance, APR, and monthly payment.
Calculate down payment amount from property price and percentage, or reverse.
Convert cups to milliliters. US and UK cup sizes. Bidirectional conversion.
Convert milliliters to cups. US and UK sizes supported.
Convert tablespoons to milliliters and back. US, UK, and Australian sizes.
Convert teaspoons to milliliters and back. US, UK, and metric sizes.
Convert yards to meters and back. Includes common length references.
Convert meters to yards and back. Includes feet and inches breakdown.
Convert stones to kilograms and pounds. Popular UK weight unit.
Convert kilograms to stones and pounds. With stones + lbs breakdown.
Convert liters to US and UK gallons. Bidirectional with common presets.
Convert miles per hour to kilometers per hour and back. Speed limit presets.
Estimate monthly electricity bill from kWh usage and rate. Appliance presets included.
Estimate solar panel output from roof area, sun hours, and panel wattage.
Calculate pool volume in liters and gallons. Rectangular and circular shapes.
Calculate gravel needed from area and depth. Results in tons and cubic yards.
Calculate download time from file size and connection speed.
Calculate screen width and height from diagonal and aspect ratio. PPI from resolution.
Plan event budget by guests and cost per head. Category breakdown included.
Calculate number of steps and tread depth from floor height and riser height.
Calculate total photo printing cost by quantity and size.
Estimate wire length from spool weight and wire gauge.
Convert kilometers per hour to miles per hour and back. Speed presets included.
Convert US and UK pints to liters instantly.
Convert liters to US and UK pints.
Convert fluid ounces to milliliters with common size presets.
Convert milliliters to fluid ounces instantly.
Convert acres to hectares for land area measurement.
Convert hectares to acres for land area measurement.
Convert square feet to square meters for real estate and construction.
Convert square meters to square feet instantly.
Convert nautical knots to kilometers per hour.
Convert any date and time to Unix timestamp in seconds and milliseconds.
Convert a Unix timestamp to human-readable date in multiple formats.
Add or subtract business days from a date, excluding weekends.
Count how many times a specific weekday occurs between two dates.
Find which fiscal quarter any date falls in with progress tracking.
Calculate exactly how much time has elapsed since any past date.
Count working days remaining until a target date, excluding weekends.
Generate upcoming pay dates based on your pay schedule.
Calculate the sale price after a percentage discount.
Calculate the percentage increase from one value to another.
Calculate the percentage decrease from one value to another.
Calculate arithmetic mean and weighted average for a set of numbers.
Find the median value of a set of numbers with sorted list display.
Convert bar pressure to PSI instantly with common presets.
Convert PSI pressure to bar instantly with common presets.
Convert watts to amps using voltage. Supports AC and DC circuits.
Convert amps to watts using voltage. Supports AC and DC circuits.
Convert horsepower to watts. Supports mechanical and metric HP.
Convert watts to horsepower. Supports mechanical and metric HP.
Convert BTU/h to watts for heating and cooling calculations.
Convert watts to BTU/h for HVAC and heating calculations.
Convert millimeters to inches with fractional inch display.
Convert inches (decimal or fractional) to millimeters.
Calculate daily food amount for your dog based on weight, age, and activity level.
Calculate daily food amount for your cat based on weight, age, and lifestyle.
Get watering schedule based on plant type, pot size, and season.
Log and track daily screen time with weekly view and goal setting.
Track daily habits with streak counter and calendar view.
Daily gratitude entries with calendar browsing. Saved locally.
Track daily mood with calendar heatmap and trend analysis.
Track birthdays with upcoming list and days-until countdown.
Organize groceries by category with check-off and text sharing.
Plan meals for the week with grocery list generation.
Convert cups to grams for common cooking ingredients like flour, sugar, butter, and rice.
Convert grams to cups for common cooking ingredients like flour, sugar, butter, and rice.
Convert calories (kcal) to kilojoules (kJ) for nutrition labeling and diet tracking.
Convert kilojoules (kJ) to calories (kcal) for nutrition labeling and diet tracking.
Convert megabits per second to megabytes per second for internet speed calculations.
Convert megabytes per second to megabits per second for internet speed calculations.
Convert light years to kilometers for astronomical distance calculations.
Convert nautical miles to kilometers for marine and aviation navigation.
Convert troy ounces to grams for precious metals like gold and silver.
Convert carats to grams for gemstones and precious stones.
Enter bill and tip amount to find the tip percentage. Reverse tip calculator.
Calculate fuel efficiency in MPG or km/L from distance and fuel used.
Calculate usable carpet area from room dimensions minus furniture and fixtures.
Calculate how many wallpaper strips you need from wall and roll dimensions.
Calculate how much area a paint can covers based on size and coverage rate.
Convert currency amounts using a manual exchange rate. No API needed.
Calculate selling price from cost and markup percentage, or find the markup.
Calculate sales commission from sale amount and commission rate.
Calculate total pay with regular and overtime hours at 1.5x or 2x rate.
Calculate tax amount, tip amount, and grand total from subtotal, tax %, and tip %.
Convert quarts to liters instantly with common presets.
Convert liters to quarts instantly with common presets.
Convert tablespoons to teaspoons. 1 tbsp = 3 tsp.
Convert teaspoons to tablespoons. 3 tsp = 1 tbsp.
Convert square yards to square meters instantly.
Convert square miles to square kilometers instantly.
Convert cubic feet to cubic meters instantly.
Convert cubic meters to cubic feet instantly.
Convert Celsius to Kelvin temperature instantly.
Convert Kelvin to Celsius temperature instantly.
Check blood pressure category from systolic and diastolic values with reference chart.
Calculate how long to reach your target weight based on weekly loss or gain rate.
Calculate daily protein needs based on weight, activity level, and fitness goals.
Track daily water intake with visual progress. Saves to localStorage.
Track daily steps toward your goal. See calories burned and distance walked.
Calculate tips based on local customs for 30 countries. Split between people.
Convert hourly rate to annual salary with custom hours per week and weeks per year.
Convert annual salary to hourly rate with monthly, weekly, and daily breakdowns.
Calculate net worth: assets minus liabilities. Visual debt-to-asset ratio.
Calculate emergency fund target and track savings progress toward your goal.
Calculate BMI Prime (BMI / 25). Shows ratio to the upper normal BMI limit.
Calculate Waist-to-Hip ratio with health risk assessment. WHO thresholds.
Calculate BSA using the Du Bois formula. Height and weight input.
Calculate running pace in min/km from distance and time.
Calculate running pace in min/mile from distance and time.
Calculate swimming pace per 100m or 100yd from distance and time.
Calculate average cycling speed from distance and time. km/h and mph.
Estimate VO2max from the Cooper 12-minute run test distance.
Estimate BAC using the Widmark formula. Drinks, weight, gender, time.
Calculate weight of snow on a roof from area, depth, and density.
Calculate feels-like temperature from wind speed and air temperature.
Calculate heat index from temperature and humidity with warning levels.
Calculate dew point from temperature and relative humidity.
Calculate distance from time delay using speed of sound (thunder/lightning).
Estimate cooking time for meat by weight, type, and oven temperature.
Calculate slices and area per person for a pizza.
Measure your reading speed in words per minute.
Calculate minimum Mbps needed for streaming quality and devices.
Estimate battery life from capacity (mAh) and consumption (mA).
Convert seconds to minutes instantly.
Convert minutes to seconds instantly.
Convert days to hours instantly.
Convert hours to days instantly.
Convert weeks to days instantly.
Convert days to weeks instantly.
Convert months to approximate days using 30.44 average.
Convert years to days using 365.25 average for leap years.
Convert degrees to radians with pi representation.
Convert radians to degrees instantly.
What is X percent of Y? Calculate instantly.
X is what percent of Y? Find the answer instantly.
Calculate the percentage change from one value to another.
Convert fractions to decimals and back.
Convert fractions to percentages and back.
Convert decimals to simplified fractions.
Solve A:B = C:? proportions instantly.
If X gives Y, then Z gives what? Cross multiplication.
Calculate X to the power of Y. Supports decimals.
Calculate log base N of X. Common log, natural log, custom base.
Calculate square root, cube root, or nth root of any number instantly.
Calculate the absolute value of any number. Learn about |x| with examples.
Round numbers to N decimal places with ceil, floor, and round options.
Calculate A mod B remainder with step-by-step explanation.
Convert numbers to and from scientific notation (1234 to 1.234 x 10^3).
See today's date in all formats with day of week, week number, and more.
See the current time in a large display with multiple formats and UTC offset.
Live countdown to December 25. Days, hours, minutes, seconds.
Live countdown to October 31. Days, hours, minutes, seconds.
Live countdown to February 14. Days, hours, minutes, seconds.
Live countdown to June 21 summer solstice. Days, hours, minutes, seconds.
Select any month and year to find out how many days it has.
Find how many ISO weeks are in any given year (52 or 53).
See how many days are left in the current year with a progress bar.
Live-updating Unix timestamp display. Copy seconds or milliseconds.
Convert liters to milliliters instantly. Free online L to mL converter.
Convert milliliters to liters instantly. Free online mL to L converter.
Convert kilograms to milligrams instantly. Free online kg to mg converter.
Convert milligrams to kilograms instantly. Free online mg to kg converter.
Convert kilometers to centimeters instantly. Free online km to cm converter.
Convert centimeters to kilometers instantly. Free online cm to km converter.
Convert meters to millimeters instantly. Free online m to mm converter.
Convert millimeters to meters instantly. Free online mm to m converter.
Convert hours to seconds instantly. Free online hours to seconds converter.
Convert seconds to hours instantly. Free online seconds to hours converter.
Convert days to minutes instantly. Free online days to minutes converter.
Convert minutes to days instantly. Free online minutes to days converter.
Convert weeks to hours instantly. Free online weeks to hours converter.
Convert months to weeks (approximate). Free online months to weeks converter.
Convert years to months instantly. Free online years to months converter.
Double any number and see a doubling table. Free online calculator.
Halve any number and see a halving table. Free online calculator.
Calculate the square of any number. Includes squares table 1-20.
Calculate the cube of any number. Shows N cubed instantly.
Calculate the reciprocal (1/N) of any number instantly.
Add up a list of numbers. Shows sum, average, and count.
Multiply two numbers and see the product. Free online multiplication tool.
Divide two numbers. Shows quotient and remainder.
Check if a number is even or odd. Educational tool with explanation.
Find the prime factors of any number. Shows factorization breakdown.
Calculate the Least Common Multiple of two numbers.
Calculate the Greatest Common Divisor of two numbers.
Convert any number (1-3999) to Roman numerals instantly.
Convert Roman numerals to decimal numbers instantly.
Convert months to years instantly. Free online converter.
Convert days to years using 365.25 average. Free converter.
Convert years to weeks (52.18 avg). Free online converter.
Convert years to hours (8766 avg). Free online converter.
Convert centuries to years. 1 century = 100 years.
Convert decades to years. 1 decade = 10 years.
Convert years to decades. Free online converter.
Convert years to centuries. Free online converter.
Convert miles to yards. 1 mile = 1760 yards.
Convert yards to miles. Free online converter.
Convert kilograms to ounces. 1 kg = 35.274 oz.
Convert ounces to pounds. 16 oz = 1 lb.
Convert pounds to ounces. 1 lb = 16 oz.
Convert cups to liters. 1 cup = 0.2366 L.
Convert liters to cups. 1 L = 4.227 cups.
Convert ounces to kilograms instantly.
Convert kilograms to pounds and remaining ounces.
Convert stone to pounds instantly.
Convert pounds to stone instantly.
Convert nautical miles to statute miles.
Convert statute miles to nautical miles.
Convert fathoms to meters instantly.
Convert meters to fathoms instantly.
Convert leagues to kilometers.
Check if a number is even.
Check if a number is odd.
Check if a number is positive.
Check if a number is negative.
Get the sign of a number (+1, -1, or 0).
Round a number up to the nearest integer.
Round a number down to the nearest integer.
Remove the decimal part of a number.
Round a number to N decimal places.
Find the minimum and maximum from a list of numbers.
Calculate the range (max minus min) of a number list.
Calculate the arithmetic mean of numbers.
Calculate the weighted average of values and weights.
Calculate the geometric mean of numbers.
Calculate the harmonic mean of numbers.
Calculate the standard deviation of a data set.
Calculate the variance of a data set.
Calculate the nth root of any number.
Calculate base raised to any power.
Convert a percentage to a simplified fraction.
How many seconds are in a day? 86,400.
How many minutes are in a day? 1,440.
How many hours are in a week? 168.
How many seconds are in a year?
Calculate your age in months.
Calculate your age in weeks.
Calculate your age in hours.
Calculate your age in minutes.
Calculate days since a specific date.
Calculate months since a specific date.
Calculate years since a specific date.
Find out when the next Friday is.
Find out when the next Monday is.
Calculate how many days until your next birthday.
Find out what season a date falls in.
Find your Chinese zodiac animal sign by birth year.
Learn how to calculate your exact age in years, months, and days. Covers age calculation methods, leap year handling, and practical uses for age data.
Understand Body Mass Index, how it is calculated, what the categories mean, and the limitations of BMI as a health metric. Free online BMI calculator included.
Learn how to calculate the number of days between two dates, add or subtract days from a date, and handle date math for deadlines, projects, and planning.
Master percentage calculations with clear formulas and examples. Covers finding percentages, percentage change, markup, discount, and tip calculations.
Convert between hourly, weekly, monthly, and yearly salary figures. Understand the math behind salary conversions, tax considerations, and how benefits affect total compensation.
Calculate tips for restaurants, services, and delivery. Understand tipping norms by country, split bills among groups, and learn when to adjust your tip percentage.
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