Online Calculators

Basic calculator, rule of three, numeric converters and more.

Calculate discounts in multiple ways: percentage, fixed amount, final price or original price

Convert between percentage and decimal in real time (e.g. 50% ↔ 0.5)

Calculate percentages in multiple ways: X% of Y, X is what % of Y, percent change and more

Basic calculator with addition, subtraction, multiplication and division

Easily calculate direct and inverse proportions

Convert Arabic numbers to Roman numerals (1 to 3999)

Frequently asked questions

What types of calculators are there?▼

We have basic calculator, rule of three, percentage calculator, Roman numeral converter, percent/decimal converter and more. All free and online.

Financial calculators, retirement simulators, compound interest and more.

Case converters, word counter, find and replace, Markdown and more.