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Water Pressure Drop Calculator
Estimate pressure loss in a pipe run with the Darcy-Weisbach equation.
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Pressure drop
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Estimate pressure loss in a pipe run with the Darcy-Weisbach equation.
Water Pressure Drop Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Pressure drop = f x (L / D) x (density x velocity squared / 2).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Water Quick Guide
Typical values for reference.
| L/min | Bore mm | Length m | Drop bar |
|---|---|---|---|
| 15 | 15 | 20 | 0.334 bar |
| 30 | 20 | 20 | 0.317 bar |
| 60 | 25 | 20 | 0.415 bar |
| 100 | 32 | 20 | 0.336 bar |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Water Pressure Drop Calculator FAQ
Answers to common questions about this calculator.
Friction along the pipe wall, plus bends and valves.
Use a wider pipe, shorter runs and fewer fittings.
Pressure drop = f x (L / D) x (density x velocity squared / 2).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.