Free Calculator · Published November 2026
GPM to Liters per Second: Multiply by 0.06309020
One gallon per minute is 0.06309020 liters per second on the printed NIST line. Ten gallons per minute are 0.63090200 liters per second.
Write gallons per minute and liters per second on the same flow note before anyone treats the number as a tank volume.
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Book a DemoHow GPM to Liters per Second Uses 0.06309020
GPM to liters per second follow one row on the NIST Guide to the SI, Appendix B.8. The gallon-per-minute row multiplies by 6.309 020 and E-02 to reach liters per second. A still gallon stays on the volume converter.
All calculations are estimates based on historical information and should be verified by the user.
Important: All calculator results are ballpark estimates
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
Gallons per Minute on One Side, Liters per Second on the Other
The conversion multiplies by 0.06309020. One gallon per minute is 0.06309020 liters per second. Twenty gallons per minute are 1.26180400 liters per second at eight decimals. The result is a flow label. It does not say a well was tested, a softener was sized, or a pump was selected.
Quick Answer
GPM to liters per second use 0.06309020, the NIST Appendix B.8 line printed as 6.309 020 E-02. One gallon per minute is 0.06309020 liters per second. Ten gallons per minute are 0.63090200 liters per second at eight decimals. The factor is not called exact. Gallons to liters are a different conversion.
One factor, both directions
The NIST table prints 6.309 020 in the multiply-by column and E-02 in the exponent column. Read together, that is 0.06309020 liters per second in one U.S. gallon per minute. This page uses 0.06309020 so a flow round-trips through liters per second. It does not build the result from a tank of gallons.
One liter per second divided by 0.06309020 is the reverse gallon-per-minute count, shown at eight decimals when the worked table needs it. The engine divided by 0.06309020. It did not use 3.785412.
Common gallon-per-minute counts
Each row multiplies by 0.06309020 and shows 8 decimal places. These are not recommended well yields or fixture counts.
| Gallons per minute | Liters per second |
|---|---|
| 1 | 0.06309020 |
| 2 | 0.12618040 |
| 5 | 0.31545100 |
| 10 | 0.63090200 |
| 20 | 1.26180400 |
Worked examples
One gallon per minute is 0.06309020 liters per second. Five gallons per minute are 0.31545100 liters per second. Ten gallons per minute are 0.63090200 liters per second at eight decimals. The reverse of 0.06309020 liters per second divides by 0.06309020 and returns one gallon per minute.
| Case | Gallons per minute | Liters per second |
|---|---|---|
| 1 gpm | 1.00000000 | 0.06309020 |
| 5 gpm | 5.00000000 | 0.31545100 |
| 10 gpm | 10.00000000 | 0.63090200 |
| 0.06309020 liters per second | 1.00000000 | 0.06309020 |
A flow is not a volume
Gallons stated as liters, using 3.785412, stay on gallons to liters. Liters per minute stated as gallons per minute stay on liters per minute to gpm. This page has no 3.785412. A minute and a second are not the same clock.
How should you write the flow?
Write five lines before the number leaves this page. A later visit should not have to guess which scale was used.
- The entered value, and whether it was gallons per minute or liters per second.
- The factor, 0.06309020, named as the NIST line.
- Both results, at 8 decimals.
- Which faucet, meter, or spec sheet the flow came from.
- A note that tank gallons and the cubic-meter-per-second row were not applied, and that the factor was not called exact.
What stays off this flow
Dividing by 1,000 to reach cubic meters per second is not how this page reads the liter row. The NIST page prints that cubic-meter row separately, as 6.309 020 E-05. This tool does not use it.
A water treatment dealer who saves the 0.06309020 note will not swap in a tank volume when a spec sheet uses liters per second. This conversion does not size a softener and does not say a well passed a county rule. A private-well lab sheet is still the well water testing guide. A broader flow page that is not this NIST row is the GPM calculator.
A meter that already reads in liters per second does not need this page to invent a second factor. Divide by 0.06309020 to see the gallons per minute. A meter that reads in gallons per minute multiplies by 0.06309020 to see the liters per second. Either way the note names the NIST row. It does not say the reading passed a code, and it does not replace the manufacturer curve on a pump.
Frequently Asked Questions
How do gpm to liters per second use 0.06309020?
Multiply gallons per minute by 0.06309020. That is the NIST Appendix B.8 row for a U.S. gallon per minute into liters per second, printed as 6.309 020 E-02. Divide liters per second by the same factor to go back. The factor is not called exact, because boldface was not preserved.
Is 0.06309020 a gallons-to-liters factor?
No. A still volume in gallons stated as liters stays on the gallons to liters converter, which uses 3.785412. This page does not use 3.785412, and it does not convert a tank volume.
Does this page convert gpm to cubic meters per second?
No. The same NIST page also prints a gallon-per-minute row into cubic meters per second, 6.309 020 E-05. This page uses the liter-per-second row only, 6.309 020 E-02. It does not divide by 1,000 on its own.
What is one gpm in liters per second?
One gallon per minute is 0.06309020 liters per second. Five gallons per minute are 0.31545100 liters per second. Ten gallons per minute are 0.63090200 liters per second at eight decimals. Those products use the printed NIST factor.
Save 0.06309020 Next to the Flow
The gallons per minute, the liters per second, and the NIST line belong on the customer record.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.