01
Fractions, exactly
Add, subtract, multiply, and divide feet-inch fractions without leaving the language of the tape measure.
ShopMath.Trade math for iPhone
Your tape measure reads feet, inches, and fractions. So does ShopMath.
Exact calculation, stairs, roof pitch, materials, and conversion tools—built for the jobsite and kept fully offline.
- One purchase
- CA$9.99
- Works offline
- No signal needed
- Your data
- Not collected
See it work
Exact tape-measure math, then the next job.
This short in-app demo adds 5' 3-7/8" + 2' 11-1/4" = 8' 3-1/8", then opens the Stairs tool with its Canadian reference defaults.
Read the exact worked example →
18-second native screen recording. No audio or autoplay.
Fast enough to use at the saw. Clear enough to check before the cut.
Five working tools
The calculations that belong in your pocket.
No feature landfill. Just the measurements that come up again and again.
02
Stairs that add up
Check risers, treads, total run, and stringer length with editable Canadian and US reference values.
03
Pitch to rafter
Move between pitch, angle, rise/run, and common-rafter length without a conversion detour.
04
Materials, not guesswork
Board feet and concrete volumes with quantity, waste, cost, and practical bag counts.
05
Imperial meets metric
Convert length, area, volume, and weight when the drawing, supplier, and jobsite disagree.
Built straight
No subscription is the feature.
Buy it once.
ShopMath is CA$9.99. There is no premium tier waiting behind the first screen.
Use it anywhere.
The app has no network calls. A bad signal does not stop a measurement.
Keep your work yours.
No account. No ads. No behavioural analytics. Your calculation history stays on your device.
A small note on precision
When a fraction must round, ShopMath shows ≈.
It does not quietly turn an exact measurement into a clean-looking guess.
ShopMath for iPhone
Math that stays out of the way.
Available now for a one-time purchase of CA$9.99.
View on the App StoreReference values are provided for convenience, not building-code advice. Verify results against local codes and manufacturer specifications.