Kilograms to Carats
Convert kilograms to carats instantly — one kilogram is 5000 carats.
| Kilograms | Carats |
|---|---|
| 1 kg | 5000 ct |
| 2 kg | 10000 ct |
| 3 kg | 15000 ct |
| 5 kg | 25000 ct |
| 10 kg | 50000 ct |
| 25 kg | 125000 ct |
| 50 kg | 250000 ct |
| 100 kg | 500000 ct |
How to use
- Enter a value in the Kilograms field.
- The Carats figure appears immediately — no button to press.
- Typing in the Carats field converts back to Kilograms the same way.
- Use the reference table for the values that come up most often.
Kilograms to Carats formula
To convert kilograms to carats, multiply by 5000.
ct = kg × 5000
Put another way, one kilogram is exactly 5,000 carats.
Why this factor: the kilogram and the carat are both defined against the kilogram, so dividing one definition by the other gives 5000 directly. Both definitions are set out in full below.
To go the other way, divide by 5000 — or use the Carats to Kilograms converter, which is the same calculation reversed.
Worked example
Given 150 kg, multiplying by 5000 yields 750000 ct.
150 kg × 5000 = 750000 ct
The converter above does this for any value you type, in either direction.
What is a kilogram?
The kilogram is the SI base unit of mass — the reference for every other mass unit.
Definition: Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.
Where it is used: Universal in science, trade and everyday weighing outside the United States.
What is a carat?
A metric carat is the standard mass unit for gemstones.
Definition: Exactly 200 milligrams — that is, 0.2 gram — standardized internationally in 1907.
Where it is used: Diamond and gemstone weight throughout the jewellery trade.
Worth knowing: Do not confuse the carat (gemstone mass) with the karat (gold purity out of 24). A 1-carat diamond and 24-karat gold measure entirely different things.
Kilograms vs Carats
The kilogram is an SI unit while the carat is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many carats are in a kilogram?
One kilogram equals 5000 carats.
What is the formula to convert kilograms to carats?
Multiply the number of kilograms by 5000. To reverse it, divide by 5000 instead.
How do I convert carats back to kilograms?
Divide by 5000, which is the same as multiplying by 0.0002.
How many carats are in 10 kilograms?
10 kg works out to 50000 ct.
Is there anything to watch out for with carats?
Do not confuse the carat (gemstone mass) with the karat (gold purity out of 24). A 1-carat diamond and 24-karat gold measure entirely different things.
How is the kilogram defined?
Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.