Convert Pounds per day to Grains per second
Convert Pounds per day (lb/d) to Grains per second (gr/s) instantly and accurately.
Conversion Formula
gr/s = lb/d × 0.08101851852
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 second
The grain per second (gr/s) equals 64.79891 mg/s or 6.479891×10⁻⁵ kg/s. The grain (= 1/7000 lb exactly) is the smallest avoirdupois mass unit, still used in ballistics for bullet and propellant-charge weights. A .308 Winchester rifle bullet of 168 gr fired in 1 s represents 168 gr/s; powder charge is typically 40-46 gr. 1 gr/s = 6.479891×10⁻⁵ kg/s = 64.79891 mg/s.
Quick Reference Table
| Pounds per day (lb/d) | Grains per second (gr/s) |
|---|---|
| 1 lb/d | 0.0810185 gr/s |
| 2 lb/d | 0.162037 gr/s |
| 5 lb/d | 0.405093 gr/s |
| 10 lb/d | 0.810185 gr/s |
| 25 lb/d | 2.02546 gr/s |
| 50 lb/d | 4.05093 gr/s |
| 100 lb/d | 8.10185 gr/s |