Grams to Kilograms Converter (g to kg)
1 g = 0.001 kg, so divide grams by 1,000. Convert grams to kilograms for parcels, food packs and paper, with g to kg and kg to g charts.
Kilogram (kg) = Gram (g) × 0.001
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
Kilogram (kg): The kilogram is the SI base unit of mass. Since 2019 it has been defined by fixing the value of the Planck constant, replacing the platinum-iridium prototype kept near Paris.
| Gram (g) | Kilogram (kg) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
Kitchen scales, postal counters and product specifications usually report grams, yet shipping rates, baggage rules and larger quantities are stated in kilograms. Dividing grams by 1,000 bridges the two, so a 3,450 g parcel is 3.45 kg and a large letter at the 750 g limit weighs 0.75 kg. Going back is a multiplication by 1,000.
Paper is a handy everyday example: office paper is sold by grammage in grams per square meter, so a single A4 sheet at 80 g/m² weighs just under 5 g, and a 500-sheet ream about 2.5 kg. For other paper grades, see the paper weight converter.
How to use this tool
- Type a value in the Gram box to see it in kilograms, or type in the Kilogram box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Weight & Mass converter.
Formula
Kilogram (kg) = Gram (g) × 0.001
Gram (g) = Kilogram (kg) × 1000
Both factors come from exact definitions: 1 kilogram = 1000 grams and 1 gram = 0.001 kilograms (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
3450 g × 0.001 = 3.45 kg
2.5 kg × 1000 = 2500 g
Gram to Kilogram chart
Common values from grams to kilograms, rounded to four decimal places.
| Gram (g) | Kilogram (kg) |
|---|---|
| 1 | 0.001 |
| 10 | 0.01 |
| 50 | 0.05 |
| 100 | 0.1 |
| 150 | 0.15 |
| 250 | 0.25 |
| 300 | 0.3 |
| 400 | 0.4 |
| 500 | 0.5 |
| 700 | 0.7 |
| 750 | 0.75 |
| 1,000 | 1 |
| 1,200 | 1.2 |
| 1,500 | 1.5 |
| 2,000 | 2 |
| 2,500 | 2.5 |
| 2,800 | 2.8 |
| 3,000 | 3 |
| 3,200 | 3.2 |
| 3,500 | 3.5 |
| 3,800 | 3.8 |
| 4,000 | 4 |
| 4,500 | 4.5 |
| 5,000 | 5 |
| 10,000 | 10 |
Kilogram to Gram chart
The reverse direction for values people often look up.
| Kilogram (kg) | Gram (g) |
|---|---|
| 0.05 | 50 |
| 0.2 | 200 |
| 0.35 | 350 |
| 0.5 | 500 |
| 0.9 | 900 |
| 1 | 1,000 |
| 1.25 | 1,250 |
| 2 | 2,000 |
| 3 | 3,000 |
| 3.6 | 3,600 |
| 4.2 | 4,200 |
| 6 | 6,000 |
Gram weights from the post and the office
| Item | Gram (g) | Kilogram (kg) |
|---|---|---|
| Royal Mail letter, maximum | 100 | 0.1 |
| Royal Mail large letter, maximum | 750 | 0.75 |
| Liter of water at about 4 °C, very nearly | 1,000 | 1 |
| Royal Mail small parcel, maximum | 2,000 | 2 |
| Ream of 500 A4 sheets at 80 g/m² | 2,494.8 | 2.4948 |
| Ream of 500 A4 sheets at 100 g/m² | 3,118.5 | 3.1185 |
Quick mental estimate
Put a decimal point three digits in from the right: 3,450 g → 3.45 kg and 750 g → 0.75 kg. The answer is exact, because a gram is defined as one thousandth of a kilogram.
Use the converter or the charts when the exact figure matters.
The two units
Gram (g): The gram is one thousandth of a kilogram, the SI base unit of mass. It is used worldwide for food, postage and small quantities of almost anything.
Kilogram (kg): The kilogram is the SI base unit of mass. Since 2019 it has been defined by fixing the value of the Planck constant, replacing the platinum-iridium prototype kept near Paris.
Frequently asked questions
What does a Royal Mail large letter weigh at most?
750 g, which is 0.75 kg. Standard letters stop at 100 g and small parcels at 2 kg, so an item between 750 g and 2,000 g needs small-parcel postage even if it is flat. The limits are maximums, so 2,001 g is already over the small-parcel limit.
Is 1,000 g of water exactly one liter?
Very nearly. Pure water is densest at about 4 °C, where a liter has a mass of about 999.97 g; at a room temperature of 20 °C it is about 998 g. For kitchen purposes, a liter of water weighing a kilogram is close enough.
How many A4 sheets make a kilogram?
At 80 g/m², about 200 sheets, since each A4 sheet weighs 4.99 g. Heavier 100 g/m² paper reaches a kilogram at about 160 sheets.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/gram-to-kilogram-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Grams to Kilograms Converter (g to kg). https://kakao.mobile/tools/gram-to-kilogram-converter/
“Grams to Kilograms Converter (g to kg).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/gram-to-kilogram-converter/.
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