Run your hydraulics. Overlay manufacturer pump curves on your system curve. Request a quote in one click. Built by engineers who got tired of toggling between PDFs, manufacturer reps, and a spreadsheet.
Pipe diameter, length, fittings, elevations. Hazen-Williams + minor losses. We auto-build your system curve.
Browse pump curves from 65 manufacturers. Find the intersection. Check efficiency, NPSHr, BEP — all on one chart.
Hit Request Quote. The manufacturer's rep gets your duty point + project details. They pay the lead fee, not you.
Hazen-Williams pipe friction, minor losses, NPSHa, total dynamic head. Save and share scenarios.
Open calculator →2,302 pump models across 65 manufacturers. Filter by category, family, flow, head.
Browse catalog →Don't know your flows? Estimate from population, fixture units, basin area, or peak factors. GLUMRB / TR-16 / IPC presets.
Estimate flows →Bundle scenarios, branches, and pump selections under a project. Auto-saves. Share via link.
Open projects →Hand-written guides on system curves, NPSH, VFDs, parallel operation, and force main hydraulics.
Read articles →Cycle-time sizing for duplex / triplex / quadplex stations. Min/max cycle constraints baked in.
Size a wet well →$0/month. No card. Sign up takes 30 seconds.
Per-lead pricing: see fee schedule. Manufacturer Agreement: read draft.
Scenarios are private to your account. We never sell engineer data to manufacturers. Quote requests are anonymous unless you opt in.
Designed for the work civil engineers actually do — force mains, lift stations, booster stations, irrigation, dewatering.
Manufacturers can't pay for ranking. Curves render the same way for everyone. Lead fees are flat; we don't sell preference.
Hit a bug? Stuck on a calc? Email info@headlosscalculator.com — a real civil engineer reads every message.
Yes. Engineers never pay. The site is funded by per-lead fees from pump manufacturers when an engineer voluntarily requests a quote. No metering, no upsell, no asterisk.
You can use the calculator anonymously right now. An account lets you save scenarios, organize them into projects, and share them with colleagues. We'll require an account before sending quote requests so manufacturers can reach you.
Currently 2,302 pump models from 63 manufacturers, digitized from published reference data (NRCS public curves + manufacturer-published TDH tables). When a manufacturer signs up and verifies their catalog, that data replaces the reference curves with the manufacturer-supplied originals.
No. Manufacturers receive only the duty-point information you submit. We never share your email until you confirm contact in the message thread. Manufacturer Agreement spells out the rules they sign.
Go to mfr.headlosscalculator.com/signup, sign the Manufacturer Agreement, upload your catalog (CSV or curve images we'll digitize for you). Standard tier ($0/yr) gets you on the platform; Pro tier ($3,000/yr) reduces lead fees and adds analytics.
The math is standard textbook hydraulics (Hazen-Williams, K-factor minor losses, NPSHa from ambient/vapor pressure). It's a design-aid, not a stamp. Every result page includes a "for educational purposes" notice — a stamped design still needs a licensed P.E. doing the review.
Open the calculator. Browse the catalog. Request a quote when you're ready. The whole loop, free, in one tab.
Free. No card. No sales calls.