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Stairs Calculator

This calculator is intented as a guide. Even though we have based the calculations on the IRC, you must always check with local building codes to ensure there are no variances.

Step1

Total Rise

Feet:
Inches:

Step2

Tread

1-2x10
1-2x12
2-2x6
2-2x8

Nosing (min ¾", max 1¼")

Inches:

Step3

Stringer Type

Outside Frame - Level with deck
Outside Frame - First rise below deck
Inside Frame - First rise below deck

Joist Measurements

2x6
2x8
2x10
2x12
Double Rim Joist?

Stringer Size

2x10
2x12

*All results given in inches

**After stringer is measured, cut thickness of one tread from bottom