# Roofing Calculator

> Roofing calculator: convert roof measurements into squares, bundles of shingles, and material estimates for your project. Free, runs in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/roofing-calculator/
- **Category:** Construction & Measurement
- **Evidence level:** authored-methodology
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

roof area = footprint area × pitch factor; bundles/squares depend on material coverage

## Worked example

A 40 x 25 ft roof with a 6-in-12 pitch: pitch factor 1.12 gives 1,118 sq ft of roof, 1,230 sq ft with 10% waste, about 12.3 roofing squares or 37 bundles.

## Assumptions

- Pitch factor is approximate
- Waste varies with valleys/hips/cuts
- Roof safety/pro inspection may be required

## Common questions

### What is a roofing square?

A roofing square is 100 square feet of roof area.

### Should I rely on this for ordering shingles?

Use it for planning only. Roof shape, pitch, waste, and local codes should be verified.

## Related tools

- /construction-estimate-tools/
- /square-feet-to-linear-feet/

## Sources

- [Calculation methodology and verification standard](/methodology/)

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*Local planning estimate. Verify current terms, rates, and policies before acting.*