Conversion Formula
$$Q_{\text{MGD}} = \frac{Q_{\text{GPM}} \times 1440}{1{,}000{,}000}$$
Multiply GPM by 1440 (minutes per day) and divide by one million.
GPM to MGD Conversion Table
| US Gallon per Minute (GPM) | Million Gallons per Day (MGD) |
|---|---|
| 0.1 | 0.000144 |
| 0.5 | 0.00072 |
| 1 | 0.00144 |
| 2 | 0.00288 |
| 5 | 0.0072 |
| 10 | 0.0144 |
| 25 | 0.036 |
| 50 | 0.072 |
| 100 | 0.144 |
| 250 | 0.36 |
| 500 | 0.72 |
| 1,000 | 1.44 |
GPM to MGD in Engineering
Flow rate conversions are critical for water resources, wastewater treatment, HVAC, and piping design. Civil engineers commonly work with GPM, CFS, and MGD, while mechanical engineers often need CFM for air handling systems.
US Gallon per Minute: Most common US unit for piping, pump, and plumbing flow rates. Essential for fire protection design.
Million Gallons per Day: Standard US unit for water and wastewater treatment plant capacity. Essential for municipal engineering.