This online calculator converts grams (g) to kilograms (kg) using the exact SI prefix relationship. The kilogram is the SI base unit of mass; the gram is formed from it by decimal prefixes. Definitions follow the BIPM SI Brochure.
Grams (g) to Kilograms (kg) Converter
Enter a value in grams (g) below and press the button to convert it to kilograms (kg).
Grams (g)
Result in Kilograms (kg)
How to Use
- Enter a mass in grams (g) in the input field.
- Select desired Decimal Places (0–10).
- Press Convert to display the result in kilograms (kg).
- Use Copy Result to place the value on the clipboard.
- Use Clear All to reset fields and the calculation trace.
- Swap — opens the companion grams to kilograms calculator.
Definitions of Measurement Units
Gram (g) — SI unit derived from the kilogram via decimal prefixes. Exact relationship: 1 g = 0.001 kg and 1 kg = 1000 g. System: SI. Abbreviation: g. Cross-system note: for context, 1 g ≈ 0.03527396 oz (avoirdupois), but this tool operates strictly within SI.
Kilogram (kg) — SI base unit of mass defined via a fixed numerical value of the Planck constant. For practical conversion here, the exact decimal relationship applies: 1 kg = 1000 g. System: SI. Abbreviation: kg.
Conversion formula
From grams to kilograms:
kg = g ÷ 1000
From kilograms to grams:
g = kg × 1000
The factor 1000 is exact by the SI prefix “kilo” (10³).
Source for SI prefixes: BIPM — SI Prefixes and NIST — Metric (SI) Prefixes.
Conversion table
| Grams (g) | Kilograms (kg) |
|---|---|
| 0.10 | 0.00010 |
| 0.50 | 0.00050 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.010 |
| 20 | 0.020 |
| 25 | 0.025 |
| 50 | 0.050 |
| 75 | 0.075 |
| 100 | 0.100 |
| 250 | 0.250 |
| 500 | 0.500 |
| 750 | 0.750 |
| 1,000 | 1.000 |
| 1,500 | 1.500 |
| 2,000 | 2.000 |
| 2,500 | 2.500 |
| 5,000 | 5.000 |
| 10,000 | 10.000 |
Real-World Examples
- U.S. dime: 2.268 g = 0.002268 kg (United States Mint spec).
- U.S. nickel: 5.000 g = 0.005000 kg (United States Mint spec).
- U.S. quarter: 5.670 g = 0.005670 kg (United States Mint spec).
- U.S. half dollar: 11.340 g = 0.011340 kg (United States Mint spec).
- U.S. cent (post-1982): 2.500 g = 0.002500 kg (United States Mint spec).
- U.S. dollar coin (gold-colored): 8.100 g = 0.008100 kg (United States Mint spec).
- Chocolate bar (labeled): 100 g = 0.100 kg.
- Butter block (EU standard): 250 g = 0.250 kg.
- Pasta pack (common label): 500 g = 0.500 kg.
- Sugar bag (metric market): 1,000 g = 1.000 kg.
What is this calculator used for in daily work or study? Requests for other mass or unit tools are welcome in the comments; the most useful ideas will be prioritized.
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