Convert Milligram to Dram (avoirdupois)
Convert milligrams to drams (avoirdupois) instantly. 1 milligram = 0.0005643834 dram (avoirdupois) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (avoirdupois) to Milligram converter for the reverse conversion.
Units explained
Milligram
A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.
From the SI prefix 'milli-' (from Latin 'mille', thousand).
Standard for medicine dosing, nutrition labels, and fine jewelry.
Part of the original metric system of 1795.
Dram (avoirdupois)
The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.
From Greek 'drachma' through Latin 'dragma'.
Historically pharmacy; today occasional cooking and firearms (powder) use.
Defined as 1/256 of the avoirdupois pound.
Milligram to Dram (avoirdupois) conversion formula
The relationship between milligrams and drams (avoirdupois):
To convert milligrams to drams (avoirdupois), multiply the value in milligrams by 0.0005643834. To reverse, multiply drams (avoirdupois) by 1771.8452.
How to use this converter
Type a value into the calculator. The result in drams (avoirdupois) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dram (avoirdupois) to Milligram converter for the reverse direction.
Step-by-step: convert milligrams to drams (avoirdupois)
- Write down the value in milligrams (mg).
- Multiply that value by the factor 0.0005643834.
- The product is the equivalent value in drams (avoirdupois) (dr).
- To reverse, multiply the dram (avoirdupois) value by 1771.8452.
Worked examples
Example 1 — Convert 1 mg to dr:
1 × 0.0005643834 = 0.0005643834 dr
Example 2 — Convert 100 mg to dr:
100 × 0.0005643834 = 0.056438339 dr
Real-world example — Packaging gauge
A 4-milligram plastic bag thickness is a common spec for grocery and freezer bags. Converting from milligrams to drams (avoirdupois) is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 mg × 0.0005643834 = 0.0022575336 dr
Real-world example — Plastic film and laminate thickness
A 500-milligram sheet is a typical spec for ID-card laminates and film overlays. Converting to drams (avoirdupois) aligns the value with the unit most CAD systems and material datasheets prefer.
500 mg × 0.0005643834 = 0.2821916949 dr
Milligram to Dram (avoirdupois) conversion table
Standard reference values for converting milligrams to drams (avoirdupois):
| Milligram [mg] | Dram (avoirdupois) [dr] |
|---|---|
| 0.01 | 5.643834e-6 |
| 0.1 | 5.643834e-5 |
| 1 | 0.0005643834 |
| 2 | 0.0011287668 |
| 3 | 0.0016931502 |
| 4 | 0.0022575336 |
| 5 | 0.0028219169 |
| 10 | 0.0056438339 |
| 20 | 0.0112876678 |
| 30 | 0.0169315017 |
| 40 | 0.0225753356 |
| 50 | 0.0282191695 |
| 100 | 0.056438339 |
| 500 | 0.2821916949 |
| 1000 | 0.5643833897 |
Frequently asked questions
How many drams (avoirdupois) is 1 milligram?
How do I convert milligrams to drams (avoirdupois)?
How do I convert drams (avoirdupois) back to milligrams?
How many drams (avoirdupois) is 100 milligrams?
Popular weight unit conversions
Convert Milligram to other weight units
Show all Milligram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 mg = 0.0005643834 dr) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.