Pipe Size Calculator
Pipe Size Calculator — quick estimate
Find the right water pipe diameter (nominal bore) for a given flow and design velocity — the everyday check for plumbing risers and mains. Adjust the inputs, then get an engineered plumbing design.
Your flow
Sizes the pipe on the velocity method (area = flow ÷ velocity). Typical water velocity is 1.0–2.5 m/s; a full design also checks friction loss, water hammer and noise.
Get an engineered plumbing design — free
Our public-health engineers will size the full pipe network, pumps and pressure zones for your building. We'll attach the estimate above automatically.
Have a BOQ, drawing or tender for this scope? Send it for an item-wise rate-analysis review →
Your request is in
Thanks! Our plumbing team will send your tailored pipe & pump design within one business day.
Indicative estimates only — not a binding design. Actual pipe sizing depends on simultaneous demand, friction loss, material, pressure and water-hammer limits.
Got your number — what next?
A calculator gives you a first figure. These take it further.
The work itself
The terms behind it
Delivered work with this scope
- MEPF for Advantec Wheels Alloy Plant, Jammu— Advantec Wheels
- Warehouse MEPF Delivered in Just 37 Days— client withheld
Need an exact BOQ, rate analysis or measurement sheet?
This is a quick engineering estimate. For tendering, billing or audit, our QS & estimation team prepares an item-wise BOQ, rate analysis and a verified measurement sheet to IS / CPWD norms — backed by 15+ years and ISO 9001:2015 quality processes.