Rafter pairs
Calculate Rafter pairs instantly with the exact formula and a worked example. Free online calculator — no signup.
Rafter pairs
House lengthm
Widthm
Rafter spacingm
Rafter pairs
18
More about: Rafter pairs
What it calculates
The “Rafter pairs” calculator computes Rafter pairs from 3 parameters: house length (m), width (m), rafter spacing (m).
Used in design, material estimation, and structural calculations.
Example calculation
With parameters House length = 10 m, Width = 8 m, Rafter spacing = 0.6 m the result is 18.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.