Grams to Kilograms
Convert gram to kilogram instantly — type a value and read the result, with the exact formula shown.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
Example
1 g = 0.001 kg, 5 g = 0.005 kg, 10 g = 0.01 kg.
Common conversions: gram to kilogram
Quick reference for the g → kg values you are most likely to need, computed with the exact factor the converter above uses. It includes the specific values people most often look up (1 g, 1,000 g, 100 g, 500 g, 250 g). See also the reverse converter: Kilogram to Gram.
| Gram (g) | Kilogram (kg) |
|---|
| 1 g | 0.001 kg |
| 2 g | 0.002 kg |
| 3 g | 0.003 kg |
| 5 g | 0.005 kg |
| 10 g | 0.01 kg |
| 15 g | 0.015 kg |
| 20 g | 0.02 kg |
| 25 g | 0.025 kg |
| 30 g | 0.03 kg |
| 40 g | 0.04 kg |
| 50 g | 0.05 kg |
| 60 g | 0.06 kg |
| 70 g | 0.07 kg |
| 75 g | 0.075 kg |
| 80 g | 0.08 kg |
| 90 g | 0.09 kg |
| 100 g | 0.1 kg |
| 150 g | 0.15 kg |
| 200 g | 0.2 kg |
| 250 g | 0.25 kg |
| 500 g | 0.5 kg |
| 1,000 g | 1 kg |
Kilogram to Gram
| Kilogram (kg) | Gram (g) |
|---|
| 1 kg | 1,000 g |
| 5 kg | 5,000 g |
| 10 kg | 10,000 g |
| 50 kg | 50,000 g |
| 100 kg | 100,000 g |
How it works
Kilogram = Gram × 0.001. Every value is converted through a single kilogram base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting grams to kilograms is one of the most common everyday calculations in the metric world, turning up whenever a small-scale measurement needs to be expressed in a larger unit. You'll meet it when a recipe lists 500 g of flour but your scale shows kilograms, when totalling parcel weights for shipping, when reading nutrition data that mixes both units, or when a science experiment records mass in grams that must roll up into a kilogram total.
Both units belong entirely to the metric system (SI), so there's no awkward imperial conversion involved — just a shift of the decimal point. The gram was originally defined as the mass of one cubic centimetre of water, while the kilogram became the SI base unit of mass (now fixed by the Planck constant since the 2019 redefinition). That's the quirk worth remembering: the base unit is the kilogram, and the gram is the derived, smaller sibling, even though "gram" sounds more fundamental.
The rule of thumb is simple: there are always 1,000 grams in a kilogram, so to go from grams to kilograms you divide by 1,000 — or just move the decimal point three places to the left. So 2,500 g becomes 2.5 kg, and 750 g becomes 0.75 kg. No multiplication tables needed.
The most common mistake is sliding the decimal the wrong way and multiplying by 1,000 instead of dividing, which turns 1 g into a wildly wrong 1,000 kg. A second pitfall is rounding too early: 0.001 kg looks like "nothing" but matters in precise dosing or lab work, so keep enough decimal places for your context rather than trimming a small gram figure down to zero.
Frequently asked questions
How do you convert gram to kilogram?
Multiply the number of grams by 0.001 to get kilograms. For example, 1 g = 0.001 kg.
What is 1 gram in kilograms?
1 gram equals 0.001 kilograms (1 g = 0.001 kg).
How many grams are in 1 kilogram?
There are 1,000 grams in 1 kilogram.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many kilograms is 500 grams?
500 grams equals 0.5 kilograms, because you divide grams by 1,000 (500 ÷ 1,000 = 0.5 kg). It's exactly half a kilogram.
Is 1000 grams equal to 1 kilogram?
Yes. By definition there are exactly 1,000 grams in 1 kilogram, so 1,000 g = 1 kg with no rounding.
How do you convert grams to kilograms without a calculator?
Just move the decimal point three places to the left, which is the same as dividing by 1,000. For example, 250 g becomes 0.25 kg and 4,000 g becomes 4 kg.
What is 250 grams in kg?
250 grams is 0.25 kilograms (250 ÷ 1,000 = 0.25 kg), which is a quarter of a kilogram.
How many grams are in half a kilogram?
Half a kilogram is 500 grams, since 0.5 × 1,000 = 500 g.
Why is the kilogram, not the gram, the base SI unit of mass?
For historical reasons the SI system defined the kilogram (not the gram) as its base unit of mass, and since 2019 it has been fixed by the Planck constant. The gram is simply one-thousandth of that base unit.
What is 100 grams in kilograms?
100 grams equals 0.1 kilograms (100 ÷ 1,000 = 0.1 kg), or one-tenth of a kilogram.
How do I convert kilograms back to grams?
Multiply the kilograms by 1,000, or move the decimal point three places to the right. For example, 2.3 kg becomes 2,300 g.
Do you divide to go from kg to g?
No, going from kilograms to grams you multiply by 1,000, so 2.5 kg × 1,000 = 2,500 g; dividing by 1,000 is the step for the opposite direction, grams to kilograms (2,500 g ÷ 1,000 = 2.5 kg). An easy check is that the gram is the smaller unit, so the same amount of stuff should be a bigger number in grams. If your number got smaller after converting to grams, you divided when you should have multiplied.
How do you convert g to kg for kids?
Tell them a kilogram is a bag of 1,000 grams, so to find out how many bags you have, you divide the grams by 1,000. The shortcut is to move the decimal point three places to the left: 500 g becomes 0.5 kg, and 2,000 g becomes 2 kg. A bag of sugar (1 kg) or a liter of water (about 1 kg) makes a good hands-on example of what 1,000 grams feels like.
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Sources & references
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