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Finance, health, maths, dates, unit conversion and home projects — answered instantly, with the formula shown so you can check the working.
Popular calculators
View all →Mortgage Calculator
Estimate your monthly mortgage payment, total interest and payoff.
BMI Calculator
Check your Body Mass Index and healthy weight range.
Percentage Calculator
Solve any percentage problem in seconds.
Age Calculator
Find your exact age in years, months, weeks and days.
Length Converter
Convert cm, inches, feet, metres, miles and more instantly.
Square Footage Calculator
Measure room area in square feet, metres and yards.
Loan Calculator
Work out monthly payments and total interest on any loan.
Calorie Calculator
Find your daily calories to lose, maintain or gain weight.
Percentage Increase Calculator
Measure percent change between two numbers — or apply one.
Browse by category
All 57 calculators
Finance(17)
View all →Mortgage Calculator
Estimate your monthly mortgage payment, total interest and payoff.
Loan Calculator
Work out monthly payments and total interest on any loan.
Compound Interest Calculator
See how your savings and investments grow over time.
Simple Interest Calculator
Calculate interest on principal alone — no compounding.
Auto Loan Calculator
Estimate your car payment including tax, trade-in and deposit.
Amortization Calculator
See how each year of payments splits into principal and interest.
Savings Goal Calculator
Find when you will hit your target — or what to save each month.
Retirement Calculator
Project your nest egg and the income it could support.
ROI Calculator
Measure return on investment, net profit and annualised growth.
Salary Calculator
Convert hourly, weekly, monthly and annual pay in one view.
Sales Tax Calculator
Add sales tax to a price or pull the tax out of a total.
VAT Calculator
Add or remove VAT at UK, EU or any custom rate.
Tip Calculator
Split the bill, work out the tip and round it off neatly.
Discount Calculator
Find the sale price after one or two discounts, plus tax.
Inflation Calculator
See what money from one year is worth in another.
Credit Card Payoff Calculator
See how long your balance takes to clear and what it costs.
Profit Margin Calculator
Turn cost and revenue into margin, markup and target pricing.
Health(11)
View all →BMI Calculator
Check your Body Mass Index and healthy weight range.
BMR Calculator
Estimate the calories your body burns at complete rest.
Calorie Calculator
Find your daily calories to lose, maintain or gain weight.
Body Fat Calculator
Estimate body fat percentage with the US Navy tape method.
Ideal Weight Calculator
Compare Devine, Robinson, Miller and Hamwi ideal weights.
Macro Calculator
Split your daily calories into protein, carbs and fat.
Pregnancy Due Date Calculator
Estimate your due date, gestational age and trimesters.
Ovulation Calculator
Estimate your fertile window and ovulation day.
Water Intake Calculator
Work out how much water to drink each day.
Target Heart Rate Calculator
Find your max heart rate and five training zones in bpm.
Running Pace Calculator
Solve for pace, time or distance and predict race times.
Math(8)
View all →Percentage Calculator
Solve any percentage problem in seconds.
Percentage Increase Calculator
Measure percent change between two numbers — or apply one.
Fraction Calculator
Add, subtract, multiply and divide fractions — simplified.
Average Calculator
Mean, median, mode and range from any list of numbers.
Ratio Calculator
Simplify ratios, solve proportions and split a total.
Standard Deviation Calculator
Population and sample standard deviation, plus variance.
GPA Calculator
Weighted grade point average on the 4.0, 10-point, German and other scales.
Grade Calculator
Weighted course grade, and the score you need on the final.
Date & Time(8)
View all →Age Calculator
Find your exact age in years, months, weeks and days.
Date Difference Calculator
Count the days, weeks and months between two dates.
Days Until Calculator
Count down the days, weeks and months to any future date.
Date Add Calculator
Add or subtract days, weeks, months and years from any date.
Time Duration Calculator
Work out the hours and minutes between two times.
Business Days Calculator
Count working days between two dates, weekends excluded.
Work Hours Calculator
Add up a weekly timesheet with breaks, pay and overtime.
Sleep Calculator
Find the best bedtimes and wake-up times using sleep cycles.
Converters(7)
View all →Length Converter
Convert cm, inches, feet, metres, miles and more instantly.
Weight Converter
Convert kg to lbs, grams to ounces, stones and tonnes instantly.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine instantly.
Volume Converter
Convert litres, gallons, cups, pints and fluid ounces instantly.
Speed Converter
Convert km/h, mph, m/s, knots and Mach in one place.
Cooking Converter
Convert cups, spoons and millilitres to grams for any ingredient.
Roman Numeral Converter
Convert numbers to Roman numerals and back, with the breakdown.
Home & DIY(6)
View all →Square Footage Calculator
Measure room area in square feet, metres and yards.
Paint Calculator
Work out litres, gallons and tins of paint for any room.
Concrete Calculator
Cubic yards, cubic metres and pre-mix bags for any pour.
Tile Calculator
Tiles, boxes and cost for any floor or wall, with waste.
Fuel Cost Calculator
Trip fuel cost from distance, efficiency and pump price.
Electricity Cost Calculator
What any appliance costs to run per day, month and year.