Convert US gallons per day to Million litres per day
Convert US gallons per day (gpd) to Million litres per day (ML/d) instantly and accurately.
Conversion Formula
ML/d = gpd × 3.785411784e-6
About US gallons per day
The US gallon per day (gpd) equals 3.785411784×10⁻³/86400 ≈ 4.381×10⁻⁸ m³/s, the standard unit in US water-utility regulation and residential water-well pump sizing. The US national average residential water use is about 80-100 gpd per person; a reverse-osmosis membrane module is rated in gpd (50-100 gpd for domestic units). 1 US gpd ≈ 4.381×10⁻⁸ m³/s.
About Million litres per day
The million litres per day (ML/d or MLD) equals 1000/86400 ≈ 0.011574 m³/s, the standard capacity unit for water-treatment plants, sewage-treatment works, and desalination facilities in the UK, India, and much of the Commonwealth. A small town water-treatment works processes 5-20 ML/d; the Beckton Sewage Treatment Works in London treats ≈700 ML/d. 1 ML/d ≈ 0.011574 m³/s = 1 000 m³/d.
Quick Reference Table
| US gallons per day (gpd) | Million litres per day (ML/d) |
|---|---|
| 1 gpd | 3.785 × 10-6 ML/d |
| 2 gpd | 7.571 × 10-6 ML/d |
| 5 gpd | 1.893 × 10-5 ML/d |
| 10 gpd | 3.785 × 10-5 ML/d |
| 25 gpd | 9.464 × 10-5 ML/d |
| 50 gpd | 0.000189271 ML/d |
| 100 gpd | 0.000378541 ML/d |