Work out your headloss and duty point in the calculator, then browse a pump library of 10,000+ manufacturer curve sheets. When a pump looks right, read the manufacturer's own sheet and send them a quote request directly.
Curve sheets from manufacturers including
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.
Search a pump library of manufacturer curve sheets from 239 manufacturers. Read the manufacturer's own sheet against your duty point โ efficiency, NPSHr, BEP straight from the source document.
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.
Open10,211 models, 239 brands. Filter by category, family, flow, head. Manufacturer curve sheets on the product page.
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.
SizeSystem curve, duty point, NPSH, and the supporting checks an engineer needs before talking to a manufacturer.
Type in a pipe size โ system curve redraws. The duty-point dot snaps to the new intersection in < 60ms.
Sign in once. Scenarios sync 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.
An account is free and optional โ it adds saved projects and scenarios.
Per-lead pricing: fee schedule. Manufacturer Agreement: read draft.
Run your hydraulics and pin the duty point, then search the pump library by category, family, flow, and head โ one tab, start to finish.
Read the manufacturer's own curve sheet on the product page โ 10,000+ curve sheets from 239 manufacturers, shown as the published document.
Send a quote request with your duty point and project notes attached โ it goes direct to the manufacturer, and they pay the lead fee, not you.
Interactive performance data appears on a product when the manufacturer provides it through their portal.
Scenarios are private to your account. Engineer data is not for sale โ manufacturers see the details you choose to send. Quote requests stay anonymous until you opt in.
Manufacturers can't pay for ranking. Listings render the same way across the pump library. Lead fees are flat; preference is not for sale.
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 what you send.
Yes โ engineers pay nothing to use the calculator or the pump library. The site is funded by per-lead fees that pump manufacturers pay when an engineer chooses to request a quote, so there is no usage cap and nothing to upgrade to.
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.
Straight from the manufacturers. The pump library covers 10,211 pump models from 239 manufacturers, with 10,000+ manufacturer curve sheets โ the manufacturer's own published PDFs, shown as documents. Interactive performance data appears on a product when the manufacturer supplies it through their portal.
No. Manufacturers receive the duty-point information you submit. Your email stays private 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, then upload your catalog with the spec/CSV template and attach your published curve sheets. Supply performance data through the portal and it appears interactively on your product pages. 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. Result pages include a "for educational purposes" notice โ a stamped design still needs a licensed P.E. doing the review.
Start with the calculator, take your duty point into the pump library, and contact manufacturers when you're ready โ free for engineers.
Manufacturers fund the site through lead fees, which keeps it free for engineers.