PREMIUM ROOFING TOOL

How to Use This Tool

This all-in-one roofing calculator converts between roof pitch and degrees, calculates rafter lengths, roof area, and more. Enter values in any format (like 4:12, 4/12, or 4 in 12) and click calculate.

Quick examples:

Pitch ↔ Degrees Converter

per 12"
Enter pitch as ratio (4:12), fraction (4/12), or rise in 12 (4 in 12)
°

Common Roof Pitches Reference

Pitch (rise:12) Angle Pitch (rise:12) Angle
0:12 0.00° (Flat) 13:12 47.29°
1:12 4.76° 14:12 49.40°
2:12 9.46° 15:12 51.34°
3:12 14.04° 16:12 53.13°
4:12 18.43° 17:12 54.78°
5:12 22.62° 18:12 56.31°
6:12 26.57° 19:12 57.72°
7:12 30.26° 20:12 59.04°
8:12 33.69° 21:12 60.26°
9:12 36.87° 22:12 61.39°
10:12 39.81° 23:12 62.45°
11:12 42.51° 24:12 63.43°
12:12 45.00°
Rafter Calculator
Roof Area Calculator
Hip/Valley Calculator

Rafter Length Calculator

inches
inches
inches

Roof Area Calculator

feet
feet

Hip & Valley Rafter Calculator

inches
Enter the length of the common rafter
Providing pitch gives more accurate hip/valley length

Quick Reference

Common Rafter: 10 ft → Hip/Valley: 14.14 ft
Common Rafter: 12 ft → Hip/Valley: 16.97 ft
Common Rafter: 14 ft → Hip/Valley: 19.80 ft
Common Rafter: 16 ft → Hip/Valley: 22.63 ft

Pitch to Percentage

Convert pitch to percentage: Pitch percentage = (Rise ÷ Run) × 100

Roof Load Calculator

Estimate roof load for materials. Enter roof area and select material type.

Snow Load Calculator

Convert snow depth to roof load. Based on snow density factors.