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Calculators

Everyday answers, money planning, maths, and family estimates.

Your everyday toolkit · 20 tools

Calculators20

Calculate percentages, percentage change, and portions.

Calculate age in calendar years, months, and days.

Count days and full weeks between two dates.

Find elapsed hours and minutes, including overnight.

Convert length, mass, and temperature.

Estimate fixed-rate monthly payments and total interest.

Project monthly compounding and regular contributions.

Estimate the monthly amount needed to reach a target.

Calculate a sale price and the amount saved.

Compare selling price, profit margin, and markup.

Calculate expressions with brackets and common functions.

Add, subtract, multiply, or divide two fractions.

Simplify a ratio and solve a missing proportion.

Find mean, median, minimum, maximum, and count.

Calculate a weighted average from scores and weights.

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

Estimate gestational weeks and days from a due date.

Estimate a possible ovulation window for regular cycles.

Calculate adult body mass index from height and weight.

Estimate adult resting energy needs using Mifflin–St Jeor.