Welding · Auto · Job site

Tom's Welding and Auto

Free calculators and Android apps for the shop, the garage and the job site. The calculators run in your browser and don't need an account.

Shop and garage

Each calculator shows the formula it uses.

Arc energy in kJ/in and kJ/mm from voltage, amperage and travel speed, with optional EN 1011 process efficiency.

Throat, cross-section and weld metal weight from leg size and length.

Compare two tire sizes for diameter, revs per mile and indicated versus actual speed.

Material estimates before you go to the store.

Cubic yards and bag counts for a slab, footing or cylinder, using Quikrete bag yields.

Gallons for a room from wall size, doors and windows, and number of coats.

A few more that came out of the same toolbox.

The score you need on a final exam to reach a target course grade.

Coffee dose or water amount from a brew ratio, starting at the SCA 1:18 default.

Estimated 1RM from a submax set, with both the Epley and Brzycki formulas.

Help pages, FAQs and privacy policies for each app.

Plate & Tube weighs and prices metal before you order it. Pitch Square reads roof pitch with your phone. ShiftPin tracks work hours by location.

Email us and say which calculator or app you were using.