Support

Questions, a result that looks wrong, or an idea? Write to info@itworkedsystems.com. Tell us what you typed and what you expected, and we usually answer within two working days.

Typing feet, inches and fractions

Type the number, then the unit key: 5 ft 3 in is 5′ 3″.
For a fraction, type it after the inches: 3 in 1 a/b 2 is 3 1/2″. A number after feet counts as inches, so 5 ft 3 is 5′ 3″.
Answers round to the nearest 1/16″ (1/8″ or 1/32″ in Settings). The display says when a result was rounded. Decimal feet, inches and metric are shown under every answer.
Length × length gives square feet, and × another length gives cubic yards. Adding a length to a plain number shows a message instead of a guess.
The % key adds or takes a percentage: after an answer, + 10 % adds 10% (for waste or markup), and × 15 % gives 15% of it.
Tap History to reuse an earlier answer.

Concrete

Choose Slab, Footing, Column or Steps and fill in the sizes. The waste allowance (10% unless you change it) is added before the bags are counted.
Bags are always rounded up, using common premixed yields: 80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45 ft³, 40 lb ≈ 0.30 ft³, 25 kg ≈ 0.0117 m³. The ready-mix figure is rounded up to the next quarter yard or quarter cubic metre.
Steps are worked out as a solid block: each step is a box as tall as all the steps under it. Add a top landing depth if you have one.

Area, paint and materials

Area works for rectangles, triangles, circles and the walls of a room (perimeter × height, about 20 sq ft off for each door or window).
Paint uses about 350 sq ft per gallon per coat. Drywall counts 4×8 sheets. Flooring and tile count boxes of the size you enter.
Tap Add to materials list under a result, then share the list from the List tab.

Jobsite Calc Pro and purchases

Free: the feet-inch calculator, the concrete slab and your last 5 answers. Pro adds footings, columns, steps, area, slope, the materials list, saved projects, PDF estimates and full history.
Bought Pro on another phone? Open Settings (gear icon) and tap Restore purchases, signed in to the same App Store or Google Play account.
To cancel a subscription: on iPhone, Settings > your name > Subscriptions; on Android, Google Play > Payments & subscriptions. Pro stays on until the end of the paid period.
Refunds are handled by Apple or Google. Write to us if anything about a purchase looks wrong.

Metric

Tap ft-in / m at the top to switch. The keypad then has m, cm and mm keys, and every answer still shows the other system too.

Your data

History, materials lists and projects are saved on your phone only. The app has no account and no cloud backup of its own, so deleting it deletes them. See the Privacy Policy.