Convert Grain to Pound
Convert grains to pounds instantly. 1 grain = 0.0001428571 pound — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pound to Grain converter for the reverse conversion.
Units explained
Grain
The grain (gr) equals 1/7000 of an avoirdupois pound, about 64.8 milligrams.
Based on the nominal mass of a single barley grain.
Ammunition and bullet mass, archery, and historical pharmacy.
Standardized through the English avoirdupois system and retained in 1959.
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.
Grain to Pound conversion formula
The relationship between grains and pounds:
To convert grains to pounds, multiply the value in grains by 0.0001428571. To reverse, multiply pounds by 7000.0010802653.
How to use this converter
Type a value into the calculator. The result in pounds updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Pound to Grain converter for the reverse direction.
Step-by-step: convert grains to pounds
- Write down the value in grains (gr).
- Multiply that value by the factor 0.0001428571.
- The product is the equivalent value in pounds (lb).
- To reverse, multiply the pound value by 7000.0010802653.
Worked examples
Example 1 — Convert 1 gr to lb:
1 × 0.0001428571 = 0.0001428571 lb
Example 2 — Convert 100 gr to lb:
100 × 0.0001428571 = 0.0142857121 lb
Real-world example — From microscopic to macroscopic
A million grains equals exactly one pound. This kind of conversion appears in microfluidics, where total channel length is given in pounds but feature widths are in grains.
1000000 gr × 0.0001428571 = 142.8571208109 lb
Real-world example — Macro-scale buildup
A million grains equals exactly one pound — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 gr × 0.0001428571 = 142.8571208109 lb
Real-world example — Quarter-meter measurement reference
A 250,000-grain length equals 0.25 pounds — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 gr × 0.0001428571 = 35.7142802027 lb
Grain to Pound conversion table
Standard reference values for converting grains to pounds:
| Grain [gr] | Pound [lb] |
|---|---|
| 0.01 | 1.428571e-6 |
| 0.1 | 1.428571e-5 |
| 1 | 0.0001428571 |
| 2 | 0.0002857142 |
| 3 | 0.0004285714 |
| 4 | 0.0005714285 |
| 5 | 0.0007142856 |
| 10 | 0.0014285712 |
| 20 | 0.0028571424 |
| 30 | 0.0042857136 |
| 40 | 0.0057142848 |
| 50 | 0.007142856 |
| 100 | 0.0142857121 |
| 500 | 0.0714285604 |
| 1000 | 0.1428571208 |
Frequently asked questions
How many pounds is 1 grain?
How do I convert grains to pounds?
How do I convert pounds back to grains?
How many pounds is 100 grains?
Popular weight unit conversions
Convert Grain to other weight units
Show all Grain conversions
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 gr = 0.0001428571 lb) 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.