Convert Grains per minute to Pounds per day
Convert Grains per minute (gr/min) to Pounds per day (lb/d) instantly and accurately.
Conversion Formula
lb/d = gr/min × 0.2057142857
About Grains per minute
The grain per minute (gr/min) equals 6.479891×10⁻⁵/60 ≈ 1.080×10⁻⁶ kg/s. This unit appears in HVAC humidity engineering: moisture added or removed from conditioned air is traditionally expressed in grains of water per pound of dry air per minute in US practice. A whole-house humidifier may evaporate 300-600 gr/min at design load. 1 gr/min ≈ 1.080×10⁻⁶ kg/s.
About Pounds per day
The pound per day (lb/d) equals 0.45359237/86400 ≈ 5.249×10⁻⁶ kg/s, used in wastewater engineering for reporting biochemical oxygen demand (BOD) loads, nutrient loadings, and sludge production. US NPDES permits set effluent mass-load limits in lb/d; a municipal WWTP serving 10 000 people generates roughly 1 500-3 000 lb/d of dry sludge solids. 1 lb/d ≈ 5.249×10⁻⁶ kg/s.
Quick Reference Table
| Grains per minute (gr/min) | Pounds per day (lb/d) |
|---|---|
| 1 gr/min | 0.205714 lb/d |
| 2 gr/min | 0.411429 lb/d |
| 5 gr/min | 1.02857 lb/d |
| 10 gr/min | 2.05714 lb/d |
| 25 gr/min | 5.14286 lb/d |
| 50 gr/min | 10.2857 lb/d |
| 100 gr/min | 20.5714 lb/d |