Pump calculators and converters for pump engineers
Affinity laws, specific speed, shaft power and hydraulic efficiency — 10 calculators you would otherwise rebuild in a spreadsheet, plus 192 units across 32 converters for flow, head, NPSH, pressure, density and viscosity.
- Calculators
- 10
- Converters
- 32
- Units covered
- 192
Calculators
Converters
Units covered
The unit tools most engineers use were not built for pumps. This one was.
- Pump quantities, not generic units
- NPSH, differential head, suction and vapour pressure are categories in their own right — not something you assemble from a length and a pressure.
- 64-digit arithmetic underneath
- Conversions run on arbitrary-precision decimals and round to significant figures, so small numbers keep their precision instead of collapsing to zero.
- Free, and no account
- Every calculator and every converter, open on arrival. Nothing to sign up for, nothing held back behind a plan.
- Fast enough for the plant floor
- Works on a phone, on site, on a bad connection — where the number is actually needed.
Quick unit converters
The eight engineers open most. Each one carries the full unit set and the formula behind it.
Pump calculators
Built to industry standards, each stating the inputs it needs and the units it expects — for designing, verifying and troubleshooting pump systems.
Stop rebuilding the same setup every time
Most sizing work uses the same four or five tools over and over. Put them on one screen once, and they are still there tomorrow.
The best place on the web to do pump maths
Not because it has the most units — because it has the right ones, and it understands what they mean. Generic converters stop at metres and pascals. This one carries the whole duty point.
The quantities general converters skip
Pump head, NPSH, suction pressure and vapour pressure are first-class categories here, not something you assemble out of a length and a pressure conversion.
Every unit, not just the popular three
Flow alone spans twenty-five units across volumetric, gas and mass flow — m³/h and gpm through to Nm³/h, MMSCFD and ton/day — and every converter explains the quantity rather than only listing factors.
Calculators built on the real relationships
Affinity laws, specific speed, suction specific speed, differential head and hydraulic efficiency — each stating the inputs it needs and the units it expects.
Usable where the work happens
Fast on a phone in a plant or on a site visit. No account, no paywall, nothing to install.
What moved in rotating equipment
Market shifts, standards changes and the engineering worth reading twice — written for people who specify and maintain pumps.
Technical articles
Longer reads on fluid mechanics, pump design and the practices behind the numbers the calculators produce.
Keep it open in the tab you never close
Everything is free and works without an account. Bookmark the converter you reach for most and it is one keystroke away next time.