L/s to GPM Converter
Convert litres per second (L/s) to US gallons per minute (GPM). One litre per second is 60 litres per minute, and 60 divided by 3.785411784 gives 15.8503 GPM. Use it when an SI design flow has to be matched to a US pump curve, flow meter or fixture rating.
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L/s to GPM conversion resultFree download
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Schedule 40 pipe sizes, water flow in GPM and LPM at four design velocities, and recommended velocities by application. One PDF, made to pin above the bench.
How It Works
L/s is the flow unit in SI-based building services, water supply and hydronic standards. GPM is what US pump curves, flow meters and plumbing fixtures are rated in. The two differ only in the volume and time units, so the conversion is a fixed factor with no dependence on pipe size or pressure.
L/s to GPM Formula
GPM = L/s × 15.8503
One litre per second equals 15.8503 US gallons per minute. Going the other way, one US gallon per minute equals 0.0630902 litres per second.
Worked Example
Converting 10 L/s:
10 × 15.8503 = 158.503 GPM
L/s to GPM Conversion Table
| L/s | GPM |
|---|---|
| 0.1 L/s | 1.58503 GPM |
| 0.5 L/s | 7.92517 GPM |
| 1 L/s | 15.8503 GPM |
| 2 L/s | 31.7007 GPM |
| 5 L/s | 79.2517 GPM |
| 10 L/s | 158.503 GPM |
| 25 L/s | 396.258 GPM |
| 50 L/s | 792.517 GPM |
| 100 L/s | 1585.03 GPM |
Going the other way? Use the GPM to L/s converter. For any other unit pair, the full flow rate converter handles every supported unit.
FAQ
Common questions about converting litres per second to US gallons per minute.
Frequently Asked Questions
How do I convert L/s to GPM?
Multiply the L/s value by 15.8503. For example, 10 L/s x 15.8503 = 158.503 GPM. The factor is 60 seconds per minute divided by 3.785411784 litres per US gallon.
How many GPM is 1 L/s?
One litre per second is 15.8503 US gallons per minute, or 13.1981 Imperial gallons per minute.
What is 5 L/s in GPM?
5 L/s is 79.2516 GPM. A quick estimate is to multiply by 16: 5 x 16 = 80 GPM, within 1%.
How do I get L/s from L/min?
Divide by 60. So 30 L/min = 0.5 L/s, and 0.5 L/s x 15.8503 = 7.93 GPM. If your figure is already in L/min, the LPM to GPM converter does it in one step.
Does the fluid matter?
No. L/s and GPM are both volumetric units, so the factor is the same for water, oil or any other liquid. Only a mass flow rate (kg/s, lb/h) depends on density.
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