Jobsite Calc

Forty construction calculators that work with no signal, no account and no waiting.

THE KEYPAD IS THE POINT

Most calculators make you convert 7-3/16" into 7.1875 before you can type it. This one has a fraction row. Tap 1, 2, feet, 7, then 3/16, then inches. You get 12' 7-3/16" and the app never asks you to do arithmetic in your head on a ladder.

It reads whatever you throw at it: 12'7-3/16", 12 ft 7 3/16 in, 151.1875 in, 3.84 m. Rounding is to the nearest 1/16 by default, switchable to 1/8 or 1/32, and if a value can't be shown exactly at your setting the display says so instead of quietly rounding it away.

WHAT'S IN IT

Concrete and masonry — slab, footing, column, stairs, block and mortar, bags from volume, rebar, gravel base

Framing and roofing — rafter length, roof pitch, roof area and squares, stud count, joist span check, stair rise and run, board feet, sheet goods

Interior finishes — paint, drywall with compound and tape, tile and grout, flooring boxes, baseboard, wallpaper

Site and landscape — topsoil and mulch, fence posts and panels, deck boards, asphalt tonnage, excavation with swell

Electrical and mechanical — Ohm's law, power and current, voltage drop, running cost, motor FLA, pipe volume, BTU sizing

Conversions — fraction to decimal to metric, area, volume, weight, pressure, temperature

EVERY RESULT SHOWS ITS WORKING

Tap "how this is calculated" and you get the actual formula with your numbers in it. No black box. If a result looks wrong you can see why in one tap, which is the difference between trusting a tool and guessing.

THE JOB SHEET

Name a job, add results to it, and the app rolls up your materials by type. A slab and its footings become one concrete order. Export the whole thing as plain text to your clipboard or straight to the share sheet — it pastes cleanly into a text message, an email or a supplier's order form.

BUILT FOR A JOB SITE

Completely offline. No account, no sign-in, nothing sent anywhere. Dark and light themes. Every button is big enough for a gloved thumb, and the keypad sits low so you can work one-handed.

HONEST ABOUT LIMITS

The structural, electrical and gas tools carry a plain warning and mean it: they are estimates from the numbers you typed. The joist span tool runs the bending and deflection checks a span table is a lookup of, but it does not know your species, your grade or your local amendments. The motor FLA tool tells you outright that the NEC requires its own tables rather than the calculation, because the calculated figure is lower and sizing wire off it would undersize it.

Verify structural, electrical and gas work against your local code and a qualified professional. This app helps you order material and check yourself. It does not sign off on anything.

FREE, WITH ADS

The app is free and paid for by ads. You choose whether those ads are personalised and you can change your mind any time in Settings. There is no interstitial on launch and none while a calculator is open.

Three saved jobs are free. Watching one short ad unlocks unlimited jobs, permanently. There is nothing to buy.