Convert Milligrams per day to Grains per hour
Convert Milligrams per day (mg/d) to Grains per hour (gr/h) instantly and accurately.
Conversion Formula
gr/h = mg/d × 0.0006430149314
About Milligrams per day
The milligram per day (mg/d) equals 10⁻⁶/86400 ≈ 1.157×10⁻¹¹ kg/s, used in toxicology (daily intake limits) and in slow-release pharmaceutical implants. WHO acceptable daily intake for food additives is expressed in mg/kg body mass per day; a 70 kg adult at 1 mg/kg/d represents a 70 mg/d dose. 1 mg/d ≈ 1.157×10⁻¹¹ 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
| Milligrams per day (mg/d) | Grains per hour (gr/h) |
|---|---|
| 1 mg/d | 0.000643015 gr/h |
| 2 mg/d | 0.00128603 gr/h |
| 5 mg/d | 0.00321507 gr/h |
| 10 mg/d | 0.00643015 gr/h |
| 25 mg/d | 0.0160754 gr/h |
| 50 mg/d | 0.0321507 gr/h |
| 100 mg/d | 0.0643015 gr/h |