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Gallons per Minute Calculator.
Calculate flow rate from gallons and elapsed minutes.
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02 / ANTWORT
gallons: 100
minutes: 5
Gallons/minute: 20
Liters/minute: 75,7082
Planning arithmetic only; enter explicit dimensions, areas, and elapsed times. No code, product, density, or design recommendation is inferred.
Use Cases
Check pump performance
Measure how many gallons a pump delivers in a set time to verify it meets specifications.
Example: If a pump fills a 50-gallon tank in 2 minutes, it flows 25 GPM.
Size irrigation systems
Determine the flow rate of a water source to plan sprinkler or drip systems.
Example: A hose fills a 5-gallon bucket in 30 seconds (0.5 min) → 10 GPM.
Frequently Asked Questions
- How do I calculate gallons per minute?
- Enter the total gallons of liquid and the elapsed time in minutes. The calculator divides gallons by minutes to give you the flow rate in GPM.
- What units does this calculator use?
- It uses gallons (gal) for volume and minutes (min) for time. The result is in gallons per minute (GPM).
- Can I use this for any liquid?
- Yes, as long as you measure the volume in gallons and time in minutes, the calculator works for water, oil, or other liquids.
Tips & Common Mistakes
Tips
- Use a stopwatch for accurate time measurement.
- Ensure the container is fully drained or filled to get precise gallon readings.
- For continuous flow, measure over a longer period to average out fluctuations.
- Convert seconds to minutes by dividing by 60 before entering.
Common Mistakes to Avoid
- Forgetting to convert seconds to minutes, leading to incorrect GPM.
- Using a container with an unknown volume instead of a calibrated one.
- Not accounting for start/stop time errors when measuring manually.
Last updated: August 13, 2026