Calculators

Convert length, weight, temperature, volume, and speed units.

Convert currencies with dated European Central Bank reference rates from the keyless Frankfurter API.

Estimate household emissions from driving and energy with disclosed EPA factors.

Calculate body mass index from height and weight.

Find exact age in years, months, and days from a birth date.

Answer the three most common percentage questions.

Estimate monthly payments and total interest for a fixed-rate loan.

Estimate principal-and-interest payments for a fixed-rate mortgage.

Project investment growth with recurring compounding.

Calculate interest without compounding.

Find sale price and savings after a percentage discount.

Calculate a tip and split the total between people.

Calculate a weighted grade point average from grades and credits.

Measure the time between two calendar dates.

Add or subtract hours and minutes without clock arithmetic.

Convert an hourly rate into weekly, monthly, and annual pay.

Estimate the hourly rate needed for an annual income target.

Find the unit sales needed to cover fixed and variable costs.

Measure gain, loss, and percentage return on an investment.

Project savings from a balance and recurring monthly contributions.

Estimate body fat using the U.S. Navy circumference method.

Estimate a due date from the first day of the last menstrual period.

Estimate trip fuel use, cost, and per-person share.

Estimate daily resting and activity-adjusted calorie needs.

Add sales tax to a price or work backward from a tax-inclusive total.

Calculate rectangular area and estimate material quantity with waste allowance.

Convert ordinary numbers to and from scientific notation.

Transpose, add, or multiply small matrices with visible dimensions and validation.

Calculate exact binomial probabilities for a chosen number of coin flips.

Add, subtract, multiply, and divide fractions with step-by-step solutions.

Calculate sample and population standard deviation, variance, and mean with formulas.