Enter k-factor, pressure, margin, and sprinkler count. Get single flow, total demand, and quick conversions. Use clean inputs for reliable hydraulic planning every day.
Base flow formula: GPM = K × √P
Where:
K = sprinkler k-factor
P = pressure at the sprinkler in PSI
GPM = discharge rate in gallons per minute
This calculator first converts bar or kPa to PSI. It then applies the square root pressure relation. If you add a safety margin, the tool increases the single sprinkler flow before multiplying by sprinkler count.
1. Enter the sprinkler k-factor.
2. Enter the available pressure value.
3. Select PSI, BAR, or KPA.
4. Add the number of sprinklers.
5. Enter an optional safety margin.
6. Choose decimal places for the output.
7. Press Calculate.
8. Review single flow, adjusted flow, and total flow.
9. Use the CSV button to save data.
10. Use the PDF button to print or save as PDF.
| K-Factor | Pressure (PSI) | Sprinklers | Margin | Single Flow (GPM) | Total Flow (GPM) |
|---|---|---|---|---|---|
| 5.6 | 7 | 4 | 10% | 16.30 | 65.21 |
| 8.0 | 10 | 6 | 5% | 26.56 | 159.37 |
| 11.2 | 12 | 8 | 0% | 38.80 | 310.42 |
| 14.0 | 15 | 10 | 8% | 58.56 | 585.58 |
A k factor to gpm calculator helps estimate sprinkler discharge from available pressure. The relationship is simple, but manual work can still slow a design review. This page turns the hydraulic equation into a faster workflow. It is useful for checking sprinkler output, comparing layout options, and preparing early flow estimates. It also helps students, estimators, and developers build cleaner calculation screens for internal tools and web utilities.
The k-factor describes how much water a sprinkler can pass at a given pressure. A higher k-factor delivers more water at the same pressure. Pressure still matters because flow changes with the square root of pressure, not in a straight line. That means doubling pressure does not double flow. This calculator makes that rule easy to read. Enter the values once, and the result appears clearly above the form.
Pressure may be entered in PSI, bar, or kPa. Many field notes and product sheets use different units. Converting pressure first keeps the equation consistent. The calculator also shows GPM and LPM outputs, so teams working in mixed unit environments can review the same result without repeating manual conversions. This reduces small errors and improves communication between drafting, coordination, inspection, and field review teams.
This tool also adds sprinkler count and safety margin inputs. Those fields help estimate total demand for small zones or quick review scenarios. The result should still be checked against project standards, product data, and local fire protection requirements. Use it for screening, planning, documentation, and software testing. It is especially helpful when you need fast hydraulic output, repeatable entries, export options, and a clean calculation record.
K-factor describes sprinkler discharge performance. It shows how much water flows through a sprinkler for a given pressure level.
The calculator uses GPM = K × √P. Pressure is converted to PSI first, then the discharge flow is calculated.
Yes. The calculator accepts PSI, bar, and kPa. It converts the chosen pressure unit into PSI before applying the equation.
Sprinkler count helps estimate total system demand. It multiplies the adjusted single sprinkler flow by the number of active sprinklers.
Safety margin increases the single sprinkler result by a chosen percentage. It is useful for early planning and conservative quick checks.
No. This is an estimating and checking tool. Final design work should follow project documents, manufacturer data, codes, and qualified engineering review.
LPM output helps teams that work in metric units. It avoids extra conversion steps and supports clearer reporting.
Yes. Use the CSV button for spreadsheet-friendly output. Use the PDF button to print or save the page as a PDF.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.