---
title: "Construction charts: fractions, roof pitch, stairs and more"
description: "Seven printable construction charts: fraction to decimal, roof pitch, board feet, concrete bags, crown molding angles, stair rise and run, and square feet."
canonical: https://klmlabs.app/construction-calculator/guides/
updated: 2026-11-07
---

# Construction charts and guides

Free charts for the job site, one US Letter page each, with answers to the questions people ask most.

## Seven charts to print

- [Fraction to decimal chart: inches, millimeters and feet](https://klmlabs.app/construction-calculator/fraction-decimal-inch-chart/): A fraction to decimal chart for every 64th of an inch, with millimeters and decimal feet, plus inches to decimal feet. Free printable PDF, US Letter.
- [Roof pitch chart: degrees, slope and rafter length](https://klmlabs.app/construction-calculator/roof-pitch-chart/): A roof pitch chart from 1/12 to 24/12: the angle in degrees, slope percent, plumb and seat cuts, and rafter length per foot of run. Free printable PDF.
- [Stair rise and run code: 7-3/4" risers, 10" treads](https://klmlabs.app/construction-calculator/stair-rise-and-run/): The 2021 IRC limits for stair risers (7-3/4" max) and treads (10" min), the 7-11 rule, and worked stair layouts for rises from 2' to 10'. Free PDF.
- [How to calculate board feet](https://klmlabs.app/construction-calculator/board-feet/): A board foot is 144 cubic inches of lumber, 12" × 12" × 1". How to calculate board feet from nominal sizes, with a printable chart for 1x4 to 6x6.
- [How many bags of concrete in a yard?](https://klmlabs.app/construction-calculator/concrete-bags-per-yard/): About 45 bags of 80 lb concrete make a cubic yard, 60 of 60 lb, 90 of 40 lb. A slab chart in yards and bags with 10% waste, as a free printable PDF.
- [How to calculate square footage from inches and fractions](https://klmlabs.app/construction-calculator/square-feet-from-feet-and-inches/): Multiply length × width in inches and divide by 144 for square feet. Worked examples with feet, inches and fractions, done exactly, and a printable chart.
- [Crown molding angles chart: miter and bevel settings](https://klmlabs.app/construction-calculator/crown-molding-angles/): Miter and bevel settings for 52/38 and 45/45 crown molding cut flat on a compound miter saw, for wall corners from 60° to 150°. Free printable chart.

Stair and roof limits follow the 2021 IRC. Check your local code.

How Construction Calculator compares with other apps: [Construction calculator apps for iPhone compared](https://klmlabs.app/construction-calculator/alternatives/)

## Work out your own with Construction Calculator

- Feet, inches and fractions, done exactly
- Stairs, roof pitch, rafters, concrete, board feet and miters
- No ads and no sign-up

Download Construction Calculator on the App Store: https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977

Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices). iPhone and iPad, iOS 17.0 or later. All the facts: https://klmlabs.app/construction-calculator/

## The facts this page states, with sources

As KLM Labs' fact record words them; the page may put them in its own words. Construction Calculator's facts page: https://klmlabs.app/construction-calculator/

- 11 tools, from stairs, roof pitch and rafters to concrete, board feet and miters. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).)
- Answers to the nearest 1/16", or any step from 1/2" to 1/64". (Source: the app's source code (private).)
- Every tool opens a short guide with a worked example. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).)

## Sources

1. [Fraction Feet Inch Calculator (Construction Calculator) on the App Store (app features and prices)](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977)

Last updated November 7, 2026.