Pound to Grain Converter
Weight · unit-converter
Convert Pound to Grain 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: Pound (lb)
To: Grain (gr)
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.
About Grain
The grain is 1/7000 of a pound (exactly 64.79891 mg). It is used in ballistics, pharmacy, and precious-metal contexts.
How to convert pounds to grains
1 pound is equal to 7000 grain:
1 lb = (453.59237 g ÷ 0.06479891 g) gr = 7000 gr
Each pound is defined as 453.59237 g and each grain as 0.06479891 g, so one lb equals 453.59237 ÷ 0.06479891 gr = 7000 gr.
Let w(lb) be the numeric value of the same mass measured in Pound (lb), and w(gr) the value in Grain (gr). Then:
w(gr) = w(lb) × (453.59237 / 0.06479891)
Equivalently, divide by how many lb fit into one gr (grams per gr divided by grams per lb):
w(gr) = w(lb) ÷ 0.00014285714286
Or: grain = pound ÷ 0.00014285714286
Examples
Example #1: Convert 20 lb to grain
20 lb = 20 lb × (453.59237/0.06479891) gr = 140000 gr
20 lb = 20 lb ÷ 0.00014285714286 = 140000 gr
Example #2: Convert 50 lb to grain
50 lb = 50 lb × (453.59237/0.06479891) gr = 350000 gr
50 lb = 50 lb ÷ 0.00014285714286 = 350000 gr
Summary
To convert Pound to Grain, multiply the value in lb by the ratio of grams per lb divided by grams per gr. Equivalently: value_gr = value_lb × (453.59237 / 0.06479891). Numerically, 1 lb equals 7000 gr.
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
| Pound (lb) | Grain (gr) |
|---|---|
| 0.1 | 700 |
| 1 | 7,000 |
| 2 | 14,000 |
| 3 | 21,000 |
| 4 | 28,000 |
| 5 | 35,000 |
| 6 | 42,000 |
| 7 | 49,000 |
| 8 | 56,000 |
| 9 | 63,000 |
| Pound (lb) | Grain (gr) |
|---|---|
| 10 | 70,000 |
| 20 | 140,000 |
| 30 | 210,000 |
| 40 | 280,000 |
| 50 | 350,000 |
| 60 | 420,000 |
| 70 | 490,000 |
| 80 | 560,000 |
| 90 | 630,000 |
| 100 | 700,000 |