Calculators
3 calculators for the jobs our guides cover. Each one works out a number you would otherwise guess at, and every one runs in your browser: nothing is sent anywhere, there is nothing to sign up for, and they work offline once loaded.
Battery Runtime Calculator
Enter your battery size and what the tool draws, and get a realistic runtime, not the number on the box.
Drill Clutch & Pilot Hole Guide
Tell it the screw and the material. It gives you a clutch setting, a speed range and the exact pilot bit to use.
Shelf Span & Sag Calculator
Check whether a shelf will hold, and how far apart the brackets can go, before you drill anything.
Looking for the tool guides?
The illustrated catalogues, showing what each tool is called and what it is for, are at tools.