Milligram to Grain Converter
Weight · unit-converter
Convert Milligram 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: Milligram (mg)
To: Grain (gr)
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
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 milligrams to grains
1 milligram is equal to 0.01543235835294 grain:
1 mg = (0.001 g ÷ 0.06479891 g) gr = 0.01543235835294 gr
Each milligram is defined as 0.001 g and each grain as 0.06479891 g, so one mg equals 0.001 ÷ 0.06479891 gr = 0.01543235835294 gr.
Let w(mg) be the numeric value of the same mass measured in Milligram (mg), and w(gr) the value in Grain (gr). Then:
w(gr) = w(mg) × (0.001 / 0.06479891)
Equivalently, divide by how many mg fit into one gr (grams per gr divided by grams per mg):
w(gr) = w(mg) ÷ 64.79891000000001
Or: grain = milligram ÷ 64.79891000000001
Examples
Example #1: Convert 20 mg to grain
20 mg = 20 mg × (0.001/0.06479891) gr = 0.3086471671 gr
20 mg = 20 mg ÷ 64.79891000000001 = 0.3086471671 gr
Example #2: Convert 50 mg to grain
50 mg = 50 mg × (0.001/0.06479891) gr = 0.7716179176 gr
50 mg = 50 mg ÷ 64.79891000000001 = 0.7716179176 gr
Summary
To convert Milligram to Grain, multiply the value in mg by the ratio of grams per mg divided by grams per gr. Equivalently: value_gr = value_mg × (0.001 / 0.06479891). Numerically, 1 mg equals 0.015432358352941431 gr.
Relationship context
You are converting between metric (SI) (Milligrams) and imperial / UK (stone, long ton, pound, ounce) (Grains). Metric mass is decimal from the gram; US and imperial masses use pounds and ounces with fixed definitions relative to the kilogram. The numeric factor used here is 1.543236e-2.
Conversion tables
| Milligram (mg) | Grain (gr) |
|---|---|
| 0.1 | 0.0015432358 |
| 1 | 0.0154323584 |
| 2 | 0.0308647167 |
| 3 | 0.0462970751 |
| 4 | 0.0617294334 |
| 5 | 0.0771617918 |
| 6 | 0.0925941501 |
| 7 | 0.1080265085 |
| 8 | 0.1234588668 |
| 9 | 0.1388912252 |
| Milligram (mg) | Grain (gr) |
|---|---|
| 10 | 0.1543235835 |
| 20 | 0.3086471671 |
| 30 | 0.4629707506 |
| 40 | 0.6172943341 |
| 50 | 0.7716179176 |
| 60 | 0.9259415012 |
| 70 | 1.0802650847 |
| 80 | 1.2345886682 |
| 90 | 1.3889122518 |
| 100 | 1.5432358353 |