Equivalent Length Calculator
Look up equivalent pipe lengths for common plumbing fittings by pipe size.
Results
Visualization
How It Works
Each pipe fitting creates friction similar to a certain length of straight pipe. Equivalent length tables convert fitting friction to an equivalent straight pipe length for use in pressure drop calculations.
The Formula
Total Eq. Length = Sum of (Count x Equivalent Length) for each fitting type
Variables
- L_eq — Equivalent length in feet per fitting
- n — Number of each fitting type
Worked Example
For 3/4" pipe with three 90-degree elbows: 3 x 2.0 ft = 6.0 ft equivalent length to add to the pipe run.
Practical Tips
- Long-radius elbows have 30-40% less equivalent length than standard
- Ball valves have much less friction than globe valves
- Check valves have high equivalent lengths — use swing type when possible
- Always calculate equivalent length for the specific pipe size