Grains to Grams Converter
Enter the weight in grains below to convert it to grams.
Convert Grains to Grams
Enter a value in grains (gr) to convert to grams (g).
Grain to Gram Conversion Table
Table showing various grain measurements converted to grams. Click any preset value or arrow to load it into the converter.
| Grains (gr) | Grams (g) |
|---|---|
| 1 gr | 0.0647989 g |
| 2 gr | 0.1295978 g |
| 5 gr | 0.3239945 g |
| 10 gr | 0.6479891 g |
| 15 gr | 0.9719836 g |
| 20 gr | 1.2959782 g |
| 25 gr | 1.6199727 g |
| 30 gr | 1.9439673 g |
| 50 gr | 3.2399455 g |
| 75 gr | 4.8599182 g |
How to Convert Grains to Grams
To convert grains to grams, multiply the weight by the following conversion ratio: 0.0647989 grams/grain.
Since one grain is equal to 0.0647989 grams, you can use this simple formula to convert:
The weight in grams is equal to the weight in grains multiplied by 0.0647989.
For example, here's how to convert 150 grains to grams using the formula above.
How Many Grams Are in a Grain?
There are 0.0647989 grams in a grain, which is why we use this value in the formula above.
Our grain to gram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Grains and grams are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Grain?
A grain is a unit of weight equal to 0.000064799 kilograms (kg), the base unit for weight. Traditional unit equal to 1/7000 of an avoirdupois pound (exact 64.79891 mg). [1]
The grain is classified as a US customary and imperial unit of weight. Grains can be abbreviated as gr; for example, 1 grain can be written as 1 gr.
When working with grains (gr) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, grains (gr) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Gram?
A gram is a unit of weight equal to 1/1,000 of a kilogram (0.001 kg). Metric unit equal to one-thousandth of a kilogram (0.001 kg). [2]
The gram is classified as a metric and SI-compatible unit of weight. Grams can be abbreviated as g; for example, 1 gram can be written as 1 g.
When working with grams (g) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, grams (g) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting weight between grains (gr) and grams (g), keep full floating-point precision (1 gr = 0.0647989 g; 1 g = 15.4323584 gr) during intermediate calculations and round only the final gram figure to match your instrument tolerance.
More Grain & Gram Conversions
Need to calculate in the opposite direction? Use our grams to grains converter (g to gr) to switch your starting unit immediately. You can also explore related tools such as converting ounces to grams, converting kilograms to grams, or converting kilograms to pounds.
Convert from Grains
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Grains (gr) to Grams (g)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Grain (gr) & Gram (g)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (gr to g)