Grain to Kilogram Converter
Convert Grain (gr) to Kilogram (kg) instantly. 1 gr = 6.479891e-5 kg.
Mass Converter
26 units available
1 gr = 6.479891e-5 kg
Formula:
kg = gr × 0.0000647989With your value: 1 gr = 6.479891e-5 kg
How big is that?
Everyday references on a logarithmic scale, all expressed in grain so you can sanity-check the result.
Other Grain to Kilogram conversions
Grain to Kilogram Conversion Table
| Grain (gr) | Kilogram (kg) |
|---|---|
| 0.5 | 3.239945e-5 |
| 1 | 6.479891e-5 |
| 2 | 0.00013 |
| 5 | 0.000324 |
| 10 | 0.000648 |
| 15 | 0.000972 |
| 20 | 0.001296 |
| 25 | 0.00162 |
| 50 | 0.00324 |
| 100 | 0.00648 |
| 250 | 0.0162 |
| 500 | 0.032399 |
| 1000 | 0.064799 |
Kilogram to Grain Conversion Table
| Kilogram (kg) | Grain (gr) |
|---|---|
| 0.5 | 7,716.179176 |
| 1 | 15,432.358353 |
| 2 | 30,864.716706 |
| 5 | 77,161.791765 |
| 10 | 154,323.583529 |
| 15 | 231,485.375294 |
| 20 | 308,647.167059 |
| 25 | 385,808.958824 |
| 50 | 771,617.917647 |
| 100 | 1,543,235.835294 |
| 250 | 3,858,089.588235 |
| 500 | 7,716,179.176471 |
| 1000 | 15,432,358.352941 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Grain (gr)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Kilogram (kg)
Mass
The kilogram is defined by taking the Planck constant to be exactly 6.626 070 15 × 10⁻³⁴ J·s.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Grain to Kilogram
To convert from Grain (gr) to Kilogram (kg), multiply the value by 6.479891e-5.
Formula: kg = gr × 0.0000647989
Reverse: gr = kg × 15,432.3583529414
Step-by-Step Example
- Start with your value in Grain. For example: 5 gr
- Multiply by the conversion factor: 5 x 6.479891e-5
- The result is: 0.000324 kg
About Grain
The grain equals exactly 64.79891 milligrams and was originally the weight of a single barleycorn. It is still the standard unit for bullets, propellant and arrows.
Common uses: ammunition, archery, pharmacy (historic).
About Kilogram
The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
Fun Fact: Until 2019, the kilogram was defined by a platinum-iridium cylinder kept in Paris, called "Le Grand K."
Common uses: body weight, cooking, shipping.
Frequently Asked Questions
How many Kilogram are in 1 Grain?
There are exactly 6.479891e-5 Kilogram in 1 Grain. This means the conversion factor from Grain to Kilogram is 6.479891e-5.
What is the formula to convert Grain to Kilogram?
The formula to convert Grain to Kilogram is: kg = gr × 0.0000647989. For example, to convert 10 Grain to Kilogram, you would multiply 10 by 6.479891e-5.
What is a Grain?
The grain equals exactly 64.79891 milligrams and was originally the weight of a single barleycorn. It is still the standard unit for bullets, propellant and arrows.
What is a Kilogram?
The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
What are the common uses of Grain?
The Grain is commonly used in ammunition, archery, pharmacy (historic).
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Grain to Kilogram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/grain-to-kilogram