Comparing two pack sizes
One pack holds 400 grams, the other 750, and both prices are per item. Comparing them needs the price per kilogram, which needs the mass in kilograms: 0.4 and 0.75. The package weights are listed in the table above.
Convert grams to kilograms
A gram is one thousandth of a kilogram, written 0.001 kg. Type a value in grams and the result appears as you go. The field accepts fractions and decimals. Further down you will find package weights and a way to do this in your head.
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How many kilograms are in a gram?
A gram is 0.001 kilograms, one thousandth. To go from grams to kilograms you divide by a thousand: kilograms = grams ÷ 1,000.[1]
This direction comes up when a figure arrives in grams and something else wants kilograms. Shipping forms, price per kilogram and school exercises all work that way.
Where the gram came from, why the kilogram is the base unit and where grams turn up if you weigh in pounds are covered on the kilograms to grams converter page.
How to convert grams to kilograms in your head
Move the decimal point three places to the left. Five hundred grams gives 0.5 kilograms, 250 grams gives 0.25 kilograms and 1,200 grams gives 1.2 kilograms. When the number has no decimal point, put one at the end and then shift it.
Below a hundred grams a zero appears after the point: 50 grams is 0.05 kilograms and 40 grams is 0.04 kilograms. Remembering one example of that shape settles the rest.
You can check any answer by going back the other way. Since 0.4 kilograms multiplied by a thousand gives 400 grams, the conversion held. That direction runs in the kilograms to grams converter.
For a single figure the mental version is quicker. For a shopping list or a spreadsheet column, the converter above saves the counting.
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When shops use grams and when they use kilograms
The line sits at roughly one kilogram and comes down to how the number reads. Below a kilogram grams keep things whole: 250 grams of butter sounds ordinary, while 0.25 kilograms of butter reads like a specification.
Above a kilogram it flips. A bag of cement is 25 kilograms, even though 25,000 grams describes the same mass. That is why food labels work in grams while parcels, luggage and building materials work in kilograms.
Nutrition figures follow their own rule. They are always quoted per 100 grams regardless of pack size, because a shared basis is what makes two products comparable. For the whole package, divide its mass by a hundred and multiply by the figure on the label.
If the mass is heading onto a form that expects imperial units, the kilograms to pounds converter and the pounds to ounces converter take it from there.
Why the scale and the label disagree
Converting grams to kilograms keeps every digit, because dividing by a thousand only moves the decimal point. A reading of 847 grams gives 0.847 kilograms to the gram.
The gap opens on the display. A kitchen scale usually resolves to one gram, a bathroom scale to a hundred, which is 0.1 kilograms. The same parcel therefore shows 847 grams on one and 0.8 kilograms on the other.
Packaging accounts for the rest. Manufacturers state net mass, the product alone, while a scale at home weighs it together with the jar or the bag. With preserves the glass can outweigh what is inside it.
For comparing products, the label figure is the one to trust. The common package weights are collected in the table below.
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Grams to kilograms conversion table
The table covers the values that come up most often in this conversion, from one gram to ten kilograms. Weights found on packaging are highlighted.
| Grams | Kilograms |
|---|---|
| 1 g | 0.001 kg |
| 2 g | 0.002 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 |
| 110 g | 0.11 kg |
| 120 g | 0.12 kg |
| 125 g | 0.125 kg |
| 150 g | 0.15 kg |
| 175 g | 0.175 kg |
| 180 g | 0.18 kg |
| Grams | Kilograms |
|---|---|
| 200 g | 0.2 kg |
| 220 g | 0.22 kg |
| 225 g | 0.225 kg |
| 250 g | 0.25 kg |
| 275 g | 0.275 kg |
| 300 g | 0.3 kg |
| 330 g | 0.33 kg |
| 350 g | 0.35 kg |
| 375 g | 0.375 kg |
| 400 g | 0.4 kg |
| 425 g | 0.425 kg |
| 450 g | 0.45 kg |
| 500 g | 0.5 kg |
| 550 g | 0.55 kg |
| 600 g | 0.6 kg |
| 650 g | 0.65 kg |
| 700 g | 0.7 kg |
| 750 g | 0.75 kg |
| 800 g | 0.8 kg |
| 850 g | 0.85 kg |
| 900 g | 0.9 kg |
| 950 g | 0.95 kg |
| Grams | Kilograms |
|---|---|
| 1,000 g | 1 kg |
| 1,100 g | 1.1 kg |
| 1,200 g | 1.2 kg |
| 1,250 g | 1.25 kg |
| 1,500 g | 1.5 kg |
| 1,750 g | 1.75 kg |
| 2,000 g | 2 kg |
| 2,200 g | 2.2 kg |
| 2,500 g | 2.5 kg |
| 3,000 g | 3 kg |
| 3,500 g | 3.5 kg |
| 4,000 g | 4 kg |
| 4,500 g | 4.5 kg |
| 5,000 g | 5 kg |
| 6,000 g | 6 kg |
| 7,000 g | 7 kg |
| 7,500 g | 7.5 kg |
| 8,000 g | 8 kg |
| 9,000 g | 9 kg |
| 10,000 g | 10 kg |
Starting from kilograms instead? Head to the kilograms to grams converter, where recipe amounts are shown next to ounces.
Package weights you see on shelves
The masses printed most often on food packaging, converted to kilograms. Useful when working out price per kilogram or comparing two pack sizes.
| Package weight | Kilograms |
|---|---|
| 100 g | 0.1 kg |
| 125 g | 0.125 kg |
| 150 g | 0.15 kg |
| 180 g | 0.18 kg |
| 200 g | 0.2 kg |
| 250 g | 0.25 kg |
| 300 g | 0.3 kg |
| 330 g | 0.33 kg |
| Package weight | Kilograms |
|---|---|
| 350 g | 0.35 kg |
| 400 g | 0.4 kg |
| 450 g | 0.45 kg |
| 500 g | 0.5 kg |
| 600 g | 0.6 kg |
| 700 g | 0.7 kg |
| 750 g | 0.75 kg |
| 800 g | 0.8 kg |
| Package weight | Kilograms |
|---|---|
| 900 g | 0.9 kg |
| 1,000 g | 1 kg |
| 1,200 g | 1.2 kg |
| 1,500 g | 1.5 kg |
| 2,000 g | 2 kg |
| 2,500 g | 2.5 kg |
| 3,000 g | 3 kg |
| 5,000 g | 5 kg |
Price per kilogram comes from dividing the pack price by its mass in kilograms. A 400 gram pack is 0.4 kilograms, so the price is divided by 0.4.
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When you need grams turned into kilograms
Four situations where a value in grams is more useful in kilograms.
Filling in a shipping form
A kitchen or postal scale reads grams while the courier form asks for kilograms to one decimal place. An 850 gram parcel is 0.85 kilograms and a 1,250 gram parcel is 1.25 kilograms.A unit conversion exercise
Converting grams to kilograms is a standard school exercise, and the whole of it is a three-place shift of the decimal point. The mental method above walks through several examples.Scaling a recipe up
A recipe lists ingredients in grams for one serving and you are cooking for ten. The multiplication produces thousands of grams, which are easier to hold in kilograms: 2,400 grams of flour is 2.4 kilograms.
Convert other units to Kilograms
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Sources
Every figure in the tables was computed from the unit definitions and checked arithmetically before publication. Historical values and the names of local units come from the sources listed above.
Content last reviewed: · written and checked by the Arteon team
Frequently asked questions about grams and kilograms
How many kilograms are in 1 gram?
A gram is 0.001 kilograms, one thousandth of a kilogram. The other way round, a kilogram holds 1,000 grams.
What is 100 g in kilograms?
100 grams is 0.1 kilograms, one tenth of a kilogram. It is also the basis manufacturers use for nutrition figures on labels.
What is 500 g in kilograms?
500 grams is 0.5 kilograms, half a kilo. It is the most common pack size on a supermarket shelf.
What is 2000 g in kilograms?
2,000 grams is 2 kilograms. The arithmetic is 2,000 ÷ 1,000. In the same way 2,500 grams gives 2.5 kilograms and 1,500 grams gives 1.5 kilograms.
What is 50 g in kilograms?
50 grams is 0.05 kilograms. Below a hundred grams a zero appears after the decimal point, because the shift is three places to the left.
How do I convert grams to kilograms without a calculator?
Move the decimal point three places to the left. When the number has no decimal point, put one at the end first. So 750 grams gives 0.75 kilograms and 40 grams gives 0.04 kilograms.
What is the formula for converting grams to kilograms?
The formula is: kilograms = grams ÷ 1,000. The other way round: grams = kilograms × 1,000. Both are exact.
Is 1,000 g definitely 1 kg?
Yes. The prefix "kilo" means a thousand, so a kilogram contains a thousand grams by definition. That relationship stayed intact when the kilogram itself was redefined in 2019.
Which is bigger, a gram or a kilogram?
The kilogram, by a factor of a thousand. Grams describe single ingredients or the weight of a letter, while kilograms describe people, luggage and freight.
How many grams are in an ounce?
One ounce holds 28.35 grams, so 500 grams comes to about 17.6 ounces. The kilograms to grams converter carries a table pairing common gram amounts with their ounce equivalents.
How many kilograms are in 1,000 mg?
1,000 milligrams is 1 gram, which is 0.001 kilograms. Milligrams appear mostly on medicine and supplement packaging, where the amounts are too small for grams to describe neatly.
How do I work out the price per kilogram?
Divide the pack price by its mass in kilograms. A 400 gram pack is 0.4 kilograms, so the price is divided by 0.4. The package weights table above lists the usual sizes.
Why are nutrition figures given per 100 g?
Because a shared basis is what lets two products be compared, whatever their pack size. To get the figure for a whole package, divide its mass by a hundred and multiply by the number on the label.
Questions or suggestions?
If you spot an error in the tables or have an idea for improving the converter, write to us. We answer every message.
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