Live calculators
Start with the calculators already available for this section, then open the related guides when you need more context.
Pipe Velocity Calculator
Mean fluid velocity from flow rate and pipe inside diameter.
Pressure Drop Calculator
Estimate pipe pressure loss with the Darcy–Weisbach equation — browser-based, explicit inputs.
Pump Affinity Laws Calculator
Scale flow, head, and power with pump speed using affinity laws.
Reynolds Number Calculator
Reynolds number from velocity, diameter, and kinematic viscosity.
CV KV Converter
Browser-based preliminary check for CV KV Converter — fast estimates, not code or stamped design output.
Darcy Friction Factor Calculator
Browser-based preliminary check for Darcy Friction Factor Calculator — fast estimates, not code or stamped design output.
Hazen Williams Calculator
Browser-based preliminary check for Hazen Williams Calculator — fast estimates, not code or stamped design output.
LMTD Calculator
Browser-based preliminary check for LMTD Calculator — fast estimates, not code or stamped design output.
Orifice Flow Calculator
Browser-based preliminary check for Orifice Flow Calculator — fast estimates, not code or stamped design output.
Total Dynamic Head Calculator
Browser-based preliminary check for Total Dynamic Head Calculator — fast estimates, not code or stamped design output.
Compressed Air Pressure Drop Calculator
Browser-based preliminary check for Compressed Air Pressure Drop Calculator — fast estimates, not code or stamped design output.
Control Valve Sizing Helper
Browser-based preliminary check for Control Valve Sizing Helper — fast estimates, not code or stamped design output.
Density Specific Gravity Converter
Browser-based preliminary check for Density Specific Gravity Converter — fast estimates, not code or stamped design output.
Duct Pressure Loss Calculator
Browser-based preliminary check for Duct Pressure Loss Calculator — fast estimates, not code or stamped design output.
Equivalent Length Calculator
Browser-based preliminary check for Equivalent Length Calculator — fast estimates, not code or stamped design output.
Flow Unit Converter
Browser-based preliminary check for Flow Unit Converter — fast estimates, not code or stamped design output.
Gas Line Velocity Calculator
Browser-based preliminary check for Gas Line Velocity Calculator — fast estimates, not code or stamped design output.
Heat Duty Calculator
Browser-based preliminary check for Heat Duty Calculator — fast estimates, not code or stamped design output.
Manning Flow Calculator
Browser-based preliminary check for Manning Flow Calculator — fast estimates, not code or stamped design output.
Minor Loss Coefficient Calculator
Browser-based preliminary check for Minor Loss Coefficient Calculator — fast estimates, not code or stamped design output.
Nozzle Flow Calculator
Browser-based preliminary check for Nozzle Flow Calculator — fast estimates, not code or stamped design output.
NPSH Calculator
Browser-based preliminary check for NPSH Calculator — fast estimates, not code or stamped design output.
Pump Efficiency Calculator
Browser-based preliminary check for Pump Efficiency Calculator — fast estimates, not code or stamped design output.
Pump Power Calculator
Browser-based preliminary check for Pump Power Calculator — fast estimates, not code or stamped design output.
Pumps In Series Parallel Calculator
Browser-based preliminary check for Pumps In Series Parallel Calculator — fast estimates, not code or stamped design output.
Residence Time Calculator
Browser-based preliminary check for Residence Time Calculator — fast estimates, not code or stamped design output.
Tank Fill Drain Time Calculator
Browser-based preliminary check for Tank Fill Drain Time Calculator — fast estimates, not code or stamped design output.
Venturi Flow Calculator
Browser-based preliminary check for Venturi Flow Calculator — fast estimates, not code or stamped design output.
Viscosity Converter
Browser-based preliminary check for Viscosity Converter — fast estimates, not code or stamped design output.
Weir Flow Calculator
Browser-based preliminary check for Weir Flow Calculator — fast estimates, not code or stamped design output.
How teams use this section
Use these workflows to choose the right calculator path before moving into deeper analysis or formal design checks.
Size a line and sanity-check velocity
Start from flow rate and pipe size, then validate velocity and Reynolds number before committing to a pressure-drop method.
Estimate pressure drop for a straight run
Pick a friction model that matches your data fidelity (Darcy-Weisbach vs Hazen-Williams), then add major losses where fittings matter.
Pump and system head checks
Relate total dynamic head, affinity laws, and NPSH margins so the hydraulic story stays consistent across operating points.
Valve and restriction sizing
Translate between Cv/Kv, orifice behavior, and line losses when throttling or metering is part of the process.
Guides for this section
Published guides help explain assumptions, formulas, and the next step after a quick calculator result.
Use this guide for quick engineering checks when you need transparent assumptions and repeatable pressure-loss estimates before detailed hydraulic modeling.
Primary tool: Pressure Drop Calculator
Use this guide when you need a fast, defensible flow-regime check before choosing correlations or pressure-drop assumptions in early engineering work.
Primary tool: Reynolds Number Calculator
Use this guide for rapid what-if checks on variable-speed operation, while being explicit that affinity laws are approximations around similar hydraulic conditions.
Primary tool: Pump Affinity Laws Calculator
Fluids & Process FAQ
When should I prefer Darcy-Weisbach over Hazen-Williams?
Darcy-Weisbach is the more general framework when fluid properties and friction factor detail matter. Hazen-Williams can be acceptable for quick water-work estimates when you accept its empirical limits.
Why do pump laws show up next to pipe loss tools?
Most real workflows iterate between the system curve (losses) and the pump curve (head and power). Keeping those checks adjacent reduces inconsistent assumptions across operating cases.
Are these tools a substitute for code compliance or stamped engineering?
No. They are structured quick checks and teaching-oriented workflows. Final design responsibility, standards selection, and documentation remain with the engineer of record.