WrenchNook makes calculators for the jobs around a house, a yard and a car: how much concrete, gravel or mulch to buy, how many drywall sheets a room takes, what size air conditioner fits, what a trip costs in gas and how two tire sizes compare. Every answer is in the units you buy things in, shows how it was worked out, and runs in your browser.
How our tools work
Every tool on WrenchNook runs inside your web browser. When you open a file, your own device does the work using built-in browser technology and WebAssembly. Nothing is uploaded, so the tools are fast, work with large files, and keep your files private.
Free, without sign-ups
You'll never need an account or an email address. The site is paid for by ads, which we keep out of the way of the tools themselves.
Who we are
WrenchNook is built and maintained by BlueEra. We'd love to hear which tool you'd like next, or about anything that doesn't work: get in touch.
More free tools from us
- SundialNook: free hours, time card, overtime and days-from-today calculators.
- PrismNook: free image compressor, resizer and HEIC to JPG converter.
- WaveNook: free mic test, voice recorder, audio cutter and converter.
Open-source software
WrenchNook is built with Preact, Lucide icons, Mona Sans font. Thank you to their authors. See the open-source licences for versions, source code and licence texts.