Feet, inches & fractions
Add, subtract, convert and review an expression without turning every tape measurement into a decimal first.
Try fraction math →One app, different jobs
Go from dimensions to a useful answer.
A construction keypad, dedicated trade tools and a place to keep the result.
Rafters & roof pitch
Work from horizontal run and pitch to geometric length and angles. Check the framing detail before cutting.
Calculate a rafter →Stairs & layout
Review equal risers, tread count and total run from finished dimensions and your project’s limits.
Calculate stairs →Concrete & drywall
Translate measured dimensions into volume or coverage. Keep product yield, sheet size and waste visible.
Calculate concrete →More tools for your trade
Explore the app’s catalog of 100+ tools and calculation modes, including flooring, paint, framing and unit conversions.
Explore app workflows →Saved jobs & reports
Keep verified calculations, notes and supported estimate reports attached to the job with Pro access.
See saving & sharing →No download needed
See all calculatorsFree construction calculators
Check the working
Three answers you can verify.
Start with a known example before entering your own dimensions.
Two cut lengths
12′ 7⅜″ + 8′ 11¾″
21′ 7⅛″
Change the measurements →10 × 10 ft pad, 4 in deep
1.2346 yd³ before waste
At an illustrative 10% allowance and 0.60 ft³/bag yield: 62 whole bags.
See yield and formulas →12 ft run at 6:12
13.4164 ft
Geometric slope length before ridge, overhang and connection adjustments.
See the diagram →Inside Construction Pro
Measure. Calculate. Keep the context.
App artwork showing the calculator, specialty tools and project workflow.
Choose what fits your work
Start free. Review Pro in the app.
Free to try here
Use the free web calculators for feet and inches, stairs, rafters, right angles, roof pitch, decimal conversions and concrete without an account. Read the worked guides and download the reference worksheets.
The iOS app is free to download. Review its introductory experience and the access shown for each tool.
Pro project workflows
Specialty-tool access and saving calculations are part of Pro. The app offers monthly, yearly and lifetime purchase options; availability, local price and any trial eligibility are shown before purchase.
Subscriptions renew under the terms shown by Apple. Lifetime does not renew and does not automatically cancel an existing subscription.
Before your first job
Does it support iPhone and iPad?
Yes. Construction Pro is designed for iPhone and iPad. Check the App Store listing for the current operating-system and device requirements. Room scanning needs compatible LiDAR hardware.
Can I use calculator tools without a connection?
The core arithmetic and local calculation tools run on your device. Apple purchases, downloads and features that use online services need a connection.
Does a stair or roof result confirm compliance?
No. Calculations use the entered dimensions and settings. Verify the applicable design, local requirements, member details and field measurements before cutting or ordering.
How do I restore a purchase or report an error?
Use Restore Purchases in the app with the Apple Account used to buy Pro. For a calculation question, include the tool, inputs with units, result and app version in a message to the developer. See the support hub.
Take the next job with you
View on the App Store ↗Keep the calculation with the project.
Use feet-inch fractions, specialty trade tools and saved job calculations in Construction Pro for iPhone and iPad. Free download with in-app Pro options.