CalcTools

Free online calculators

Compare dates, estimate download times, and work out payments.

Browse common tools below, or choose a category.

Common calculators

Compare two years or complete dates.

Add or subtract days from a date.

Count elapsed days, weeks, months, and years.

Find age from a birth date or estimate a birth date.

Estimate transfer time from file size and connection speed.

Add and subtract hours, minutes, and seconds.

Estimate monthly payments with your loan assumptions.

Calculate BMI from height and weight.

Year gaps, age, date differences, durations, and time zones.

File download estimates and everyday calculations.

Loan payments, savings growth, and income estimates.

Body measurements, nutrition, and fitness calculations.

Scientific calculations, fractions, and graphing.

Game-specific comparison tools.