Online-Calculator.com

Online-Calculator.com was created in November 2007 - as part of a hobby project to learn basic programming and web design skills!

Since then, it has become one of the most popular websites on the internet for a range of calculators, conversions, and other maths based applications, apps and tools!

The site has been expanded from the original JavaScript based calculator on the homepage – to a more advanced html5 canvas based calculator – and we’ve continued to use this technology to provide super-simple, user intuitive calculators and conversion tools that simulate real-world designs making it easier for our users to understand how to use the tools we offer.

We are constantly adding new and improved tools and gadgets to the site – even after 17 years! The range of possibilities is endless. We hope you enjoying using the calculators we make as much as we enjoy making them! Thank you so much for using the site – and supporting us for all this time.

Conversions Calculators

Effortlessly convert units, currencies, and more with our comprehensive range of simple to use conversion calculators! Here are just a few, make sure you check our all the others we have to offer!

Our weight conversion tools are accurate, easy to use, and offer a wide range of units.
Get precise and hassle-free length conversions with our user-friendly and comprehensive length conversion calculators.
Our temperature conversion calculators are accurate, simple to use, and covers various temperature units.
Loads of other easy to use conversion tools!

Featured Tools:

These are some of the most popular calculators and tools on the site!

Darts Calculator

Our Darts Calculator helps players calculate scores and checkouts quickly and accurately, making the game more enjoyable and competitive!

Darts Calculator

BMI Calculator

Our BMI Calculator quickly calculates Body Mass Index to help users understand their weight status and make informed health decisions.

BMI Calculator

Online Abacus

Our Online Abacus is a virtual version of the traditional counting tool, designed to help children learn and practice basic math skills.

Online Abacus

Scientific Calculator

Our Scientific Calculator is a powerful tool that performs complex mathematical calculations and functions.

Scientific Calculator