Convert Grains per hour to Milligrams per hour

Convert Grains per hour (gr/h) to Milligrams per hour (mg/h) instantly and accurately.

Grains per hour (gr/h)
Milligrams per hour (mg/h)

Conversion Formula

mg/h = gr/h × 64.79891

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.

About Milligrams per hour

The milligram per hour (mg/h) equals 10⁻⁶/3600 ≈ 2.778×10⁻¹⁰ kg/s, adopted in transdermal drug-patch pharmacokinetics to express dermal absorption rate. A nicotine patch typically releases 14-21 mg over 24 h, corresponding to ≈0.58-0.88 mg/h. Environmental emission tests for laboratory fume hoods also express contaminant escape in mg/h. 1 mg/h = 1/3600 mg/s.

Quick Reference Table

Grains per hour (gr/h)Milligrams per hour (mg/h)
1 gr/h64.7989 mg/h
2 gr/h129.598 mg/h
5 gr/h323.995 mg/h
10 gr/h647.989 mg/h
25 gr/h1619.97 mg/h
50 gr/h3239.95 mg/h
100 gr/h6479.89 mg/h

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