Convert Milligrams to Quarters
Convert Milligrams (mg) to Quarters (qr) instantly and accurately.
Conversion Formula
qr = mg × 7.873652221e-8
About Milligrams
A milligram (mg) is one thousandth of a gram (10⁻³ g). It is the primary unit for pharmaceutical dosing: aspirin tablets are typically 500 mg, ibuprofen 200-400 mg, and melatonin supplements 0.5-10 mg. Precious metal assay results and alloy compositions are specified in milligrams per kilogram (mg/kg = ppm). Nutritional labels worldwide list mineral content in milligrams - the recommended daily intake of iron is 8-18 mg, calcium 1000 mg, and sodium under 2300 mg. A grain of rice weighs about 25-30 mg, and a medium eyelash approximately 0.1 mg.
About Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
Quick Reference Table
| Milligrams (mg) | Quarters (qr) |
|---|---|
| 1 mg | 7.874 × 10-8 qr |
| 2 mg | 1.575 × 10-7 qr |
| 5 mg | 3.937 × 10-7 qr |
| 10 mg | 7.874 × 10-7 qr |
| 25 mg | 1.968 × 10-6 qr |
| 50 mg | 3.937 × 10-6 qr |
| 100 mg | 7.874 × 10-6 qr |