Drain fall & gradient calculator
Calculate the gradient of a measured drain run.
01
Your measurements
Enter your project values. Your estimate updates as you type.
View your estimateExample values are a starting point. Check product yields and specifications before ordering.
YOUR ESTIMATE
Gradient
1%
Slope angle0.573 °
Sloping length10 m
Calculated from your measurements.
How it's calculated
Gradient (%) = rise ÷ horizontal run × 100. Angle = arctan(rise ÷ run).
Calculations use consistent units for your selected measurements. Whole purchase quantities are rounded up.
What this estimate includes
This reports a measured gradient. Required gradients and drainage sizing depend on the applicable design and local rules.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.
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