About Us

toolsfree.biz.id is a free collection of online calculators for finance, health, math, unit conversion, and everyday decisions. Every calculator shows the formula it uses, so you can check the result yourself.

What we do

We build simple, fast tools that work on any phone or computer, with no signup. Calculations run in your browser, so the numbers you enter are not sent to our servers.

How we keep results accurate

Each calculator is tested against worked examples before it is published. If you find an error, tell us and we will review it.