Your life in 768 free calculators

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About us

In a surprisingly large part, our reality consists of calculable problems. Should I buy or rent? What's my ideal calorie intake? Can I afford to take this loan? How many lemonades do I need to sell in order to break even? Often times we don't solve these problems, because we lack knowledge, skills, time or willingness to calculate. And then we make bad, uninformed decisions.

Omni Calculator is here to change all that - we are working on a technology that will turn every* calculation-based problem trivial to solve for anyone.

*within reason

The most popular calculators


Use the free circumference calculator to find the area, circumference and diameter of a circle.

Compound interest

With the compound interest calculator, you can accurately predict how profitable certain investments will be for your portfolio.


Exponent calculator helps you find the result of any base raised to a positive or negative exponent.


Gas calculator estimates your gas usage and costs of travelling by car.

Grams to cups

The grams to cups calculator converts between cups and grams. You can choose between 20 different popular kitchen ingredients or directly type in the product density.


GST calculator figures out a price of product including Goods and Service Tax.


Use the online margin calculator to find out the sale price, the cost or the margin percentage itself.


Simple percentage calculator is a generic percentage-based problem solver.

Sales tax

Sales tax calculator works out the tax imposed on the sale of goods and services.


The slope calculator helps find the slope of any line through two given points.

Square footage

Square footage calculator turns length and width into an area and converts to/from multiple units.

Square root

Square root calculator helps you find the square root of any positive number.