Calculators
Practical calculators for the jobs our guides cover. Everything runs in your browser — nothing is sent anywhere, and there is nothing to sign up for.
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.