Hose fluid capacity
Fluid capacity
in hoses and pipes
Calculate the fluid volume contained in a hose or pipe from its inner diameter and length. Useful for system bleeding, first fills and weight estimation.
Capacity calculator
V = π × (d/2)² × L
Standard sizes:
Custom density:g/cm³ (= kg/L)
Formula: V = π × (inner_d/2)² × L. Result is the internal volume — does not include walls or fittings.
Quick reference: capacity per metre (various diameters)
| Size | Inner Ø (mm) | mL/m | L/m | L/10 m |
|---|---|---|---|---|
| 1/4" (6.4 mm) | 6.35 | 31.7 | 0.0317 | 0.317 |
| 3/8" (9.5 mm) | 9.53 | 71.3 | 0.0713 | 0.713 |
| 1/2" (12.7 mm) | 12.7 | 126.7 | 0.1267 | 1.267 |
| 3/4" (19.1 mm) | 19.05 | 285.0 | 0.2850 | 2.850 |
| 1" (25.4 mm) | 25.4 | 506.7 | 0.5067 | 5.067 |
| 1¼" (31.8 mm) | 31.75 | 791.7 | 0.7917 | 7.917 |
| 1½" (38.1 mm) | 38.1 | 1140.1 | 1.1401 | 11.401 |
| 2" (50.8 mm) | 50.8 | 2026.8 | 2.0268 | 20.268 |
Click a row to load it in the calculator with length 1 m.
Need help with fluid selection?
We advise on the right hydraulic fluid or coolant for your system.