Convert Grains per second to Pounds per minute
Convert Grains per second (gr/s) to Pounds per minute (lb/min) instantly and accurately.
Conversion Formula
lb/min = gr/s × 0.008571428571
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.
About Pounds per minute
The pound per minute (lb/min) equals 0.45359237/60 ≈ 7.560×10⁻³ kg/s, the standard unit for US fire-suppression system design (sprinkler flow demand) and HVAC hydronic loop balancing. A fire-sprinkler head at 15 psi discharges roughly 30-40 lb/min of water; industrial humidifiers are rated in lb/min of steam. 1 lb/min ≈ 7.560×10⁻³ kg/s = 60 lb/h.
Quick Reference Table
| Grains per second (gr/s) | Pounds per minute (lb/min) |
|---|---|
| 1 gr/s | 0.00857143 lb/min |
| 2 gr/s | 0.0171429 lb/min |
| 5 gr/s | 0.0428571 lb/min |
| 10 gr/s | 0.0857143 lb/min |
| 25 gr/s | 0.214286 lb/min |
| 50 gr/s | 0.428571 lb/min |
| 100 gr/s | 0.857143 lb/min |