Grain to Pound Converter
Weight · unit-converter
Convert Grain to Pound with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Grain (gr)
To: Pound (lb)
About Grain
The grain is 1/7000 of a pound (exactly 64.79891 mg). It is used in ballistics, pharmacy, and precious-metal contexts.
About Pound
The international avoirdupois pound is exactly 0.45359237 kg. It is the standard pound for weight in the US and for many trade weights.
How to convert grains to pounds
1 grain is equal to 0.00014285714286 pound:
1 gr = (0.06479891 g ÷ 453.59237 g) lb = 0.00014285714286 lb
Each grain is defined as 0.06479891 g and each pound as 453.59237 g, so one gr equals 0.06479891 ÷ 453.59237 lb = 0.00014285714286 lb.
Let w(gr) be the numeric value of the same mass measured in Grain (gr), and w(lb) the value in Pound (lb). Then:
w(lb) = w(gr) × (0.06479891 / 453.59237)
Equivalently, divide by how many gr fit into one lb (grams per lb divided by grams per gr):
w(lb) = w(gr) ÷ 7000
Or: pound = grain ÷ 7000
Examples
Example #1: Convert 20 gr to pound
20 gr = 20 gr × (0.06479891/453.59237) lb = 0.0028571429 lb
20 gr = 20 gr ÷ 7000 = 0.0028571429 lb
Example #2: Convert 50 gr to pound
50 gr = 50 gr × (0.06479891/453.59237) lb = 0.0071428571 lb
50 gr = 50 gr ÷ 7000 = 0.0071428571 lb
Summary
To convert Grain to Pound, multiply the value in gr by the ratio of grams per gr divided by grams per lb. Equivalently: value_lb = value_gr × (0.06479891 / 453.59237). Numerically, 1 gr equals 0.00014285714285714287 lb.
Relationship context
Both units belong to imperial / UK (stone, long ton, pound, ounce). Relationships such as 16 oz per lb and 14 lb per stone are exact in the avoirdupois system; tons use fixed pound counts. This tool uses international definitions tied to the kilogram.
Conversion tables
| Grain (gr) | Pound (lb) |
|---|---|
| 0.1 | 0.0000142857 |
| 1 | 0.0001428571 |
| 2 | 0.0002857143 |
| 3 | 0.0004285714 |
| 4 | 0.0005714286 |
| 5 | 0.0007142857 |
| 6 | 0.0008571429 |
| 7 | 0.001 |
| 8 | 0.0011428571 |
| 9 | 0.0012857143 |
| Grain (gr) | Pound (lb) |
|---|---|
| 10 | 0.0014285714 |
| 20 | 0.0028571429 |
| 30 | 0.0042857143 |
| 40 | 0.0057142857 |
| 50 | 0.0071428571 |
| 60 | 0.0085714286 |
| 70 | 0.01 |
| 80 | 0.0114285714 |
| 90 | 0.0128571429 |
| 100 | 0.0142857143 |