Convert Pound to Dram (avoirdupois)
Convert pounds to drams (avoirdupois) instantly. 1 pound = 255.9999993227 dram (avoirdupois) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (avoirdupois) to Pound converter for the reverse conversion.
Units explained
Pound
The pound (lb) is a unit of mass equal to exactly 0.45359237 kilogram.
From Latin 'libra pondo' (a pound by weight); the symbol lb comes from 'libra'.
The primary weight unit in the United States and informally in the UK.
The international avoirdupois pound was fixed in the 1959 yard-and-pound agreement.
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.
Pound to Dram (avoirdupois) conversion formula
The relationship between pounds and drams (avoirdupois):
To convert pounds to drams (avoirdupois), multiply the value in pounds by 255.9999993227. To reverse, multiply drams (avoirdupois) by 0.00390625.
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 Pound converter for the reverse direction.
Step-by-step: convert pounds to drams (avoirdupois)
- Write down the value in pounds (lb).
- Multiply that value by the factor 255.9999993227.
- The product is the equivalent value in drams (avoirdupois) (dr).
- To reverse, multiply the dram (avoirdupois) value by 0.00390625.
Worked examples
Example 1 — Convert 1 lb to dr:
1 × 255.9999993227 = 255.9999993227 dr
Example 2 — Convert 100 lb to dr:
100 × 255.9999993227 = 25599.999932274 dr
Real-world example — Pet and accessory dimensions
A 3-pound dog leash equals a tidy round value in drams (avoirdupois). Pet-supply shopping frequently mixes the two units across product specifications.
3 lb × 255.9999993227 = 767.9999979682 dr
Real-world example — Fabric and tailoring
One pound of fabric converts to a value in drams (avoirdupois) commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 lb × 255.9999993227 = 255.9999993227 dr
Real-world example — Body height conversion (reverse direction)
You measure 1.75 pounds tall and need to fill in a gym membership form or medical record that asks for height in drams (avoirdupois). This is the most-used everyday length conversion in metric-using countries.
1.75 lb × 255.9999993227 = 447.9999988148 dr
Pound to Dram (avoirdupois) conversion table
Standard reference values for converting pounds to drams (avoirdupois):
| Pound [lb] | Dram (avoirdupois) [dr] |
|---|---|
| 0.01 | 2.5599999932 |
| 0.1 | 25.5999999323 |
| 1 | 255.9999993227 |
| 2 | 511.9999986455 |
| 3 | 767.9999979682 |
| 4 | 1023.999997291 |
| 5 | 1279.9999966137 |
| 10 | 2559.9999932274 |
| 20 | 5119.9999864548 |
| 30 | 7679.9999796822 |
| 40 | 10239.9999729096 |
| 50 | 12799.999966137 |
| 100 | 25599.999932274 |
| 500 | 127999.99966137 |
| 1000 | 255999.9993227399 |
Frequently asked questions
How many drams (avoirdupois) is 1 pound?
How do I convert pounds to drams (avoirdupois)?
How do I convert drams (avoirdupois) back to pounds?
How many drams (avoirdupois) is 100 pounds?
Popular weight unit conversions
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Metric / SI (18 units)
Avoirdupois (14 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 lb = 255.9999993227 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.