About PracticalBench

PracticalBench is a collection of practical tools that help people calculate, check, compare, inspect and understand real-world problems — from working out how much concrete a patio needs, to what it costs to charge an EV, to budgeting a home renovation.

What we aim to help with

Every tool on PracticalBench solves one specific, real problem. We don't publish generic content for its own sake — if a tool exists here, it's because it does a genuinely useful calculation, conversion, check or comparison, with its assumptions shown rather than hidden.

How the site is structured

Tools are grouped into categories by the kind of problem they solve — Build, Drive, Home, and more as they're added. Each category page lists the tools available in it; each tool page explains what it does, how it works, what it assumes, and where it falls short.

Design philosophy

• Tools run in your browser wherever practical — nothing is uploaded unless a tool explicitly says otherwise.
• Assumptions and methodology are shown, not buried.
• Results are estimates based on the inputs you give — see our disclaimer.
• No account, no paywall, no dark patterns in how privacy choices are presented.

Who operates this site

PracticalBench is operated by the site's operator.

Who writes and checks it

Blog posts are edited and approved by Maria Chambers, our editor — a mathematician by training who checks that every figure can be reproduced. The standards we work to, including how we use sources and how corrections are made, are in our editorial policy, and every significant change or correction is recorded on What's improved.

This page describes the site as it actually works today, not aspirational features. See our methodology for how tools are built and tested.