Pipe Flow Calculator

• Free online pipe flow calculator — works right in your browser, no installation needed
• Enter pipe diameter, length, and velocity or flow rate to calculate flow rate, velocity, Reynolds number, flow regime, Darcy friction factor, head loss, pressure drop, and other hydraulic parameters
• Built-in pipe material and fluid presets, ideal for water supply, drainage, HVAC, and hydraulic engineering design

1. Open the tool page — no download or installation required
2. Choose the calculation mode (by velocity or by flow rate), then enter the pipe inner diameter, pipe length, and velocity or flow rate
3. Select a pipe material and fluid preset, or adjust roughness, density, viscosity, and other parameters manually as needed
4. Click the "Recalculate" button to view results such as flow rate, Reynolds number, friction factor, head loss, and pressure drop, and copy them with one click if needed

• This tool is completely free and requires no registration or login
• All calculations run locally in your browser — your data is never uploaded
• Results are for engineering reference only; verify important designs against actual operating conditions

Free online pipe flow calculator. Calculate flow rate, Reynolds number, Darcy friction factor, head loss, and pressure drop from pipe diameter, velocity, or flow rate. Useful for plumbing, HVAC, and hydraulic engineering.

Open the tool page — no download or installation required Choose the calculation mode (by velocity or by flow rate), then enter the pipe inner diameter, pipe length, and velocity or flow rate Select a pipe material and fluid preset, or adjust roughness, density, viscosity, and other parameters manually as needed Click the "Recalculate" button to view results such as flow rate, Reynolds number, friction factor, head loss, and pressure drop, and copy them with one click if needed

This tool is completely free and requires no registration or login All calculations run locally in your browser — your data is never uploaded Results are for engineering reference only; verify important designs against actual operating conditions

Yes, Pipe Flow Calculator is completely free. No download or installation required — it runs right in your browser.