About

Helper Tools is a small collection of free online calculators and converters. The goal is simple: answer everyday questions like "how many inches is 30 cm?" quickly and accurately, without sign-ups, pop-ups or app downloads.

How we build tools

• Fast: pages are lightweight and load quickly on phones.
• Accurate: conversion factors follow international standards, and each page shows the formula it uses.
• Private: calculations run in your browser; we do not collect what you type.

How the site is funded

We show ads through Google AdSense to pay for hosting and development, and we try to keep them out of the way of the tools.

Found an error or want a new tool? Get in touch.