Tool collection

Calculators

Everyday calculators for percentages, ages, dates, averages, ratios and more — all running instantly in your browser.

Solve every common percentage question: of, change, increase and decrease.

Find your exact age in years, months and days, plus total days lived.

Count the days, weeks and months between two dates.

Add or subtract days, weeks, months or years from any date.

Add and subtract hours, minutes and seconds.

Calculate the mean, median, mode, sum and count of a list of numbers.

Simplify ratios and solve for a missing value in a proportion.

Add, subtract, multiply and divide fractions with simplified results.

Generate random numbers within a range, with optional uniqueness.

Create arithmetic or geometric number sequences.

A full scientific calculator with trigonometry, logarithms and more.

Free tools, ready when you need them

These tools are designed for quick answers with clear inputs and readable results. Basic calculations run in your browser, so no account is required.