Mathematics
Percentage calculator
Find a percentage, a share or a relative change.
Calculators: 47
All calculators
Finance
Discount calculator
See the new price and how much you save.
Mathematics
Proportion calculator
Find the missing value in A / B = C / X.
Finance
Loan calculator
Estimate your monthly payment and total interest.
Finance
Compound interest
Grow a starting balance with monthly contributions.
Mathematics
Shape area calculator
Calculate the area of a rectangle, triangle or circle.
Date and time
Time calculator
Add or subtract two durations in hours and minutes.
Unit conversion
Length converter
Convert metres, kilometres, inches, feet and other length units.
Unit conversion
Mass converter
Convert grams, kilograms, tonnes, pounds and ounces.
Unit conversion
Temperature converter
Convert Celsius, Fahrenheit and kelvin.
Date and time
Add or subtract dates
Move a date forward or backward by years, months, weeks and days.
Date and time
Age calculator
Find age on a chosen date in years, months and days.
Unit conversion
Area converter
Convert square metres and feet, hectares, acres and other area units.
Mathematics
Average calculator
Find the arithmetic mean, minimum and maximum of a list.
Mathematics
Basic calculator
Arithmetic expressions with parentheses and decimal numbers.
Health
BMI calculator
Calculate body mass index from height and weight for adults aged 18+.
Health
BMR calculator
Estimate resting energy expenditure with the Mifflin–St Jeor equation.
Date and time
Business days
Count working days with custom weekends and excluded dates.
Construction
Concrete calculator
Calculate rectangular concrete volume with an allowance.
Unit conversion
Cooking unit converter
Convert teaspoons, tablespoons, cups, fluid ounces and millilitres.
Finance
Currency converter
Convert currencies using a dated reference exchange rate.
Unit conversion
Data storage converter
Convert bytes, decimal KB–TB and binary KiB–TiB.
Date and time
Date difference
Count days between dates and see the calendar duration.
Date and time
Time duration
Find the duration between two local date-times in hours and minutes.
Construction
Flooring calculator
Estimate material area with allowance and the number of packs.
Mathematics
Fraction calculator
Add, subtract, multiply, divide and simplify fractions.
Everyday life
Fuel cost calculator
Estimate trip cost from distance, fuel consumption and fuel price.
Unit conversion
Fuel economy converter
Convert L/100 km, km/L, US MPG and imperial MPG.
Education
GPA calculator
Calculate a credit-weighted GPA using numeric, letter or custom scales.
Education
Grade calculator
Find a final percentage from assignment scores and weights.
Finance
Mortgage payment
Estimate monthly principal-and-interest payments and total interest.
Construction
Paint calculator
Estimate litres of paint from area, coverage and coat count.
Mathematics
Percentage change
Calculate the percentage increase or decrease between two values.
Mathematics
Ratio calculator
Simplify the ratio of two integers or decimals.
Finance
Return on investment (ROI)
Compare total proceeds with the amount invested and costs.
Finance
VAT / sales tax
Add tax to a net price or remove tax already included in a gross price.
Finance
Savings goal
Find the monthly contribution needed to reach a savings target.
Mathematics
Scientific calculator
Powers, roots, logarithms and trigonometry in degrees or radians.
Finance
Simple interest
Calculate interest without compounding and the final balance.
Unit conversion
Speed converter
Convert kilometres and miles per hour, metres per second and knots.
Health
TDEE calculator
Estimate daily energy expenditure including activity.
Construction
Tile calculator
Estimate tiles and whole packs including cutting allowance.
Date and time
Time zone converter
Convert date-times between time zones with daylight-saving rules.
Everyday life
Tip calculator
Calculate the tip, total bill and equal share per person.
Unit conversion
Volume converter
Convert litres, millilitres, cubic metres and gallons.
Mathematics
Weighted average
Enter values and their weights in separate rows.
Date and time
Work hours / time card
Calculate shift length minus unpaid breaks.
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