Convert Pounds per day to Grains per hour
Convert Pounds per day (lb/d) to Grains per hour (gr/h) instantly and accurately.
Conversion Formula
gr/h = lb/d × 291.6666667
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.
About Grains per hour
The grain per hour (gr/h) equals 6.479891×10⁻⁵/3600 ≈ 1.800×10⁻⁸ kg/s, used in HVAC psychrometric calculations for dehumidifier capacity and moisture-removal rates. ASHRAE load calculation spreadsheets report latent loads in grains of water per hour; a typical residential dehumidifier removes 5×10⁵-2×10⁶ gr/h. 1 gr/h ≈ 1.800×10⁻⁸ kg/s.
Quick Reference Table
| Pounds per day (lb/d) | Grains per hour (gr/h) |
|---|---|
| 1 lb/d | 291.667 gr/h |
| 2 lb/d | 583.333 gr/h |
| 5 lb/d | 1458.33 gr/h |
| 10 lb/d | 2916.67 gr/h |
| 25 lb/d | 7291.67 gr/h |
| 50 lb/d | 14583.3 gr/h |
| 100 lb/d | 29166.7 gr/h |