Pipe Length Calculator

A run of pipe is not just the tape measure across the ceiling. Every elbow, tee and valve behaves like a little extra length of pipe that burns pressure, and the real question is usually not distance but budget - how far can this run go before the pressure runs out?

Pipe Length Calculator answers in two directions: the effective length your fittings cost you, and the maximum run your pressure budget allows.

• Effective length: Straight pipe plus fitting equivalents.
• Maximum run: Length your pressure budget sustains.
• Fitting library: Elbows, tees, valves and reducers.
• Both systems: Feet or metres, psi/bar/kPa.
• Live: Results update as you type.
• Export: Text, CSV or JSON report.

1. Choose a mode: effective length, or maximum run.
2. Effective length: enter straight distance and fitting counts.
3. Maximum run: enter flow, size, pressure budget and C factor.
4. Read the result in feet or metres.
5. Export the report when done.

Example 1 — Effective. 30 ft straight, four 90 degree elbows and one globe valve on 3/4 in pipe cost about 22 extra equivalent feet.

Example 2 — Max run. 4 GPM in 3/4 in (C=140) against a 3 psi budget will run about 145 ft before the pressure is gone.

• Two real questions: Cost and reach of layouts.
• Standard fitting math: L/D equivalents.
• Pressure budgets: Sized from real limits.
• Field fast: No charts to carry.
• Free and private: No uploads, no logging.