Trade calculators · iOS + Android

Four calculators. Pick your trade.

Four offline calculator apps a working tradesperson actually uses — on a phone, in the field, with no signal. Free on the App Store and Google Play.

Offline-first
No ads
No accounts
No tracking
Pro Unlock optional

Available worldwide · 175 App Store territories · Built in Texas

ShopCalc

For machinists & shop floor

Speeds & feeds
Tap drill + threading
G-Code generator (Pro)
Tool Library (Pro)

WelderCalc

For welders & fabricators

SMAW + TIG + MIG amperage
Heat input + travel speed
Carbon equiv + preheat
Filler reference (SS/Al)

BuilderCalc

For builders & contractors

Concrete (slab/footing/pier)
Beam span + joist + rafter
IRC stairs
Drywall + paint + materials

ElectricianCalc

For electricians (NEC-grade)

Wire sizing + 310.15 derating
Voltage drop (CMA + Table 9)
Conduit fill (mixed conductors)
Motor FLA + OCPD

Same DNA

Built the same way. Built for the same person.

Every app in the family follows the same rules. Pro Unlock comes three ways — monthly, yearly (best value), or lifetime once. Buy lifetime once and every future Pro tool is included.

Offline-first
No ads
No accounts
No tracking
Pro Unlock optional

Have a question?

Real people answer. Texas hours, no scripts.

Stuck on a calculator. Found an edge case the app didn't handle. Want a fifth calc app for a trade we don't cover yet. Tell us — same small team that builds these, support included.

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Reading the spec sheet