Convert MGD to Cubic Metres per Day (MGD to m3/day)
1 million US gallons per day (MGD) = 3785.411784 cubic metres per day (m³/day). 1 m³/day = 0.0002641720524 MGD. Example: 15 MGD = 15 × 3785.411784 = 56781.17676 m³/day.
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1 MGD = 3785.411784 m³/day
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk MGD to cubic metre per day converter to paste a column from Excel.
How to Convert MGD to Cubic Metre per Day
- 1 MGD = 3785.411784 m³/day
- 1 m³/day = 0.0002641720524 MGD
- Example: convert 15 MGD to m³/day: 15 MGD = 15 × 3785.411784 m³/day = 56781.17676 m³/day
Formula
m³/day = MGD × 3785.411784
Derivation from SI units:
- 1 MGD = 10⁶ × 3.785411784 L per day ≈ 0.0438 m³/s.
- 1 m³/day = 1/86,400 m³/s; one kilolitre per day (KLD).
- 1 MGD = 0.04381263638889 m³/s ÷ 0.00001157407407407 m³/s per m³/day = 3785.411784 m³/day
Both units are defined exactly, so the factor is exact. MGD definition: million US gallons per day; Cubic Metre per Day definition: cubic metre per day.
Worked examples
- A reading of 5 MGD converts to 18927.05892 m³/day.
5 MGD × 3785.411784 = 18927.05892 m³/day - A value of 50 MGD is 189270.5892 m³/day.
50 MGD × 3785.411784 = 189270.5892 m³/day
MGD to Cubic Metre per Day conversion table
| MGD | Cubic Metres per Day (m³/day) |
|---|---|
| 0.5 MGD | 1892.705892 m³/day |
| 1 MGD | 3785.411784 m³/day |
| 2 MGD | 7570.823568 m³/day |
| 5 MGD | 18927.05892 m³/day |
| 10 MGD | 37854.11784 m³/day |
| 20 MGD | 75708.23568 m³/day |
| 50 MGD | 189270.5892 m³/day |
| 100 MGD | 378541.1784 m³/day |
| 500 MGD | 1892705.892 m³/day |
| 1000 MGD | 3785411.784 m³/day |
Where it's used
MGD are used for US treatment-plant capacity, while cubic metres per day appear in STP and ETP capacity (KLD). Both measure volumetric discharge of rivers, canals and water supply, so the conversion is a fixed factor.
MGD to other water discharge units
| Conversion | 1 MGD equals |
|---|---|
| MGD to cubic metre per day | 3785.411784 m³/day |
| MGD to cumec | 0.04381263639 m³/s |
| MGD to cusec | 1.547228652 ft³/s |
| MGD to MLD | 3.785411784 MLD |
| MGD to litre per second | 43.81263639 L/s |
| MGD to MGD (imp) | 0.8326741846 MGD (imp) |
| MGD to acre-foot per day | 3.068883277 acre-ft/day |
Frequently asked questions
How many cubic metres per day are in 1 million US gallons per day?
1 MGD = 3785.411784 m³/day.
How do I convert million US gallons per day to cubic metres per day?
Multiply the value in MGD by 3785.411784. For example, 15 MGD × 3785.411784 = 56781.17676 m³/day.
Is the MGD to m³/day conversion exact?
Yes. Both units are defined exactly, and 1 MGD is exactly 3785.411784 m³/day.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "gallon (U.S.)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert MGD to Cubic Metres per Day (MGD to m3/day). Retrieved October 29, 2026, from https://scientificconverters.com/discharge/mgd-to-cubic-meters-per-day/
IEEE
Scientific Converters, "Convert MGD to Cubic Metres per Day (MGD to m3/day)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/discharge/mgd-to-cubic-meters-per-day/