About CalcTen
Last updated: 1 November 2026
CalcTen is a free collection of online calculators for home improvement, DIY and everyday life. It was founded by Rashid Mehmood with a simple goal: give people in the US, UK, Australia and Canada fast, accurate answers in the units and product sizes they actually use, and explain how those answers are worked out.
What we do
Each calculator is paired with a guide covering the formula, worked examples, regional differences, practical tips and frequently asked questions. We start with home and DIY projects and are expanding into garden, conversion and health calculators.
Editorial policy
- Tested calculations. Calculation logic lives in a shared library that is covered by automated tests. Worked examples in our guides are checked against the calculator.
- Exact conversions. Unit conversions use exact definitions published by the US National Institute of Standards and Technology (NIST).
- Real sources. Product figures such as bag yields or tin sizes come from manufacturers' published data, industry associations or government agencies, which we link from each guide. Where a figure varies by product, we say so and let you edit the assumption.
- No invented statistics. We do not publish figures we cannot source. Estimates and typical values are labelled as such.
- Regular review. Each page shows its last-updated date. We revise pages when products, standards or sources change.
- Independence. CalcTen is supported by advertising. Advertisers do not influence our calculators or guides, and we do not accept payment for recommendations.
Corrections
If you think something is wrong, please tell us at contact@calcten.com. We investigate every report and correct errors promptly.
Important
Our calculators provide estimates for planning purposes and are not a substitute for professional advice. See our disclaimer.