Small, sharp online tools
TinkerBrook is a growing collection of free calculators, converters and generators. Each one does a single job well: open it, get your answer, get back to what you were doing. No sign-up, no downloads, and everything works on your phone.
First tools in the workshop
The first batch is being built and tested right now:
- Sourdough hydration calculator — work out true dough hydration including your starter, or go the other way: pick a target hydration and get exact ingredient weights. Live now.
- Air fryer conversion calculator — turn any oven time and temperature into air fryer settings.
- Video bitrate calculator — find the right bitrate for your resolution, frame rate and platform.
- Minecraft circle generator — pixel-perfect circle and oval blueprints for your builds.
- EV charging cost calculator — what a full charge really costs with your own electricity rate.
How TinkerBrook works
Every tool ships together with a plain-English guide that explains the formula behind it, so you can trust the number you get — or do the math yourself next time. Tools are built to stay fast: static pages, no trackers beyond basic ads, nothing to install.