Run hydraulics. Overlay pump curves from every major manufacturer on your system curve. Request a quote with one click โ and skip the two-week PDF chase.
Curves available from
From a fresh project to a vendor-agnostic pump shortlist in under five minutes.
Pipe diameter, length, fittings, elevations. Hazen-Williams + minor losses. We build your system curve as you type.
Pull pump curves from 115 manufacturers. Find the duty point. Check efficiency, NPSHr, BEP โ all on one chart.
Hit Request Quote. The manufacturer rep gets your duty point + project notes. They pay the lead fee โ you pay nothing.
Hazen-Williams, fitting losses, NPSHa, TDH. Save and share scenarios.
Open2,450 models, 115 brands. Filter by category, family, flow, head.
BrowseDon't know your flows? Estimate from population, fixtures, basin area. GLUMRB / TR-16 / IPC presets.
EstimateBundle scenarios, branches, pump selections. Auto-save. Share via link.
OpenHand-written guides on system curves, NPSH, VFDs, parallel operation, force mains.
ReadCycle-time sizing for duplex / triplex / quadplex. Min/max cycle constraints baked in.
SizeThree calls a day to manufacturer reps, replaced by one tab.
Type in a pipe size โ system curve redraws. The duty-point dot snaps to the new intersection in < 60ms.
Sign in once. Every scenario syncs to your account. Open a project on your phone at the job site.
When you're ready, ping the manufacturer with the duty point + project context. They pay the lead fee, not you.
$0/month. No card. 30 seconds to signup.
Per-lead pricing: fee schedule. Manufacturer Agreement: read draft.
This is what every junior engineer has been asking for. Stop opening 14 PDFs. The duty-point overlay alone saves an hour a project.
Manufacturer-agnostic + free for engineers + per-lead pricing for us is the right model. We get warm leads with the duty point already pinned.
I used to bookmark three OEM portals. Now I bookmark one tab. Quote responses are 4 days instead of 14.
Quotes paraphrase real conversations with launch users. Verified attribution coming as launch partners sign on.
Scenarios are private to your account. We never sell engineer data to manufacturers. Quote requests are anonymous unless you opt in.
Manufacturers can't pay for ranking. Curves render the same way for everyone. Lead fees are flat; we don't sell preference.
Designed for the work civil engineers actually do โ force mains, lift stations, booster stations, irrigation, dewatering.
Hit a bug? Stuck on a calc? Email info@headlosscalculator.com โ a real 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 require an account before sending quote requests so manufacturers can reach you.
Currently 2,450 pump models from 115 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 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. The Manufacturer Agreement spells out the rules.
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 โ 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.