All calculators
24 tools online. Each page shows inputs, formula, and a worked example.
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Percentage Calculator
Find X% of a number, or what percent one number is of another.
Percentage Change Calculator
Percent increase or decrease between two values.
Average Calculator
Arithmetic mean of a comma-separated list of numbers.
Ratio Calculator
Simplify a:b and scale a ratio to a target total.
Square Root Calculator
Principal square root of a non-negative number.
Circle Area Calculator
Area and circumference from radius.
Triangle Area Calculator
Area from base and height.
Pythagorean Theorem Calculator
Find the missing side of a right triangle.
BMI Calculator
Body Mass Index from height and weight (metric).
BMR Calculator
Basal metabolic rate (Mifflin–St Jeor).
Ideal Weight Calculator
Devine formula ideal body weight.
Tip Calculator
Split a bill with tip across any number of people.
Compound Interest Calculator
Future value with compound interest.
Loan Payment Calculator
Fixed monthly payment for an amortizing loan.
Simple Interest Calculator
Interest and total with I = Prt.
Discount Calculator
Sale price after a percent discount.
Sales Tax Calculator
Add sales tax to a net price.
ROI Calculator
Return on investment as a percent.
Length Converter
Convert between meters, centimeters, feet, and inches.
Weight Converter
Convert between kilograms and pounds.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin.
Speed Converter
Convert km/h and mph.
Age Calculator
Exact age from a birth date.
Days Between Dates Calculator
Whole days between two calendar dates.