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Choose a Karat and Calculate
Common-karat alloy content in grams and percentages.
Gold Alloy Composition
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—
Fine Gold Weight—
Fine Gold %—
Non-Gold Alloy—
Alloy %—
Karat Ratio—
Total Weight—
24K, 22K, 18K and 14K Gold Explained
| Karat | Fine Gold % | Non-Gold Alloy % |
|---|---|---|
| 24K | 100% | 0% |
| 22K | 91.6667% | 8.3333% |
| 18K | 75% | 25% |
| 14K | 58.3333% | 41.6667% |
These percentages come directly from the standard karat relationship: karat divided by 24.
Formula
Fine Gold = Total Weight × Karat ÷ 24
Non-Gold Alloy = Total Weight − Fine Gold
Non-Gold Alloy = Total Weight − Fine Gold
Example: 100 g of 14K Gold
Fine Gold = 100 × 14 ÷ 24 = 58.333333 g
Non-Gold Alloy = 100 − 58.333333 = 41.666667 g
Non-Gold Alloy = 100 − 58.333333 = 41.666667 g
The calculator keeps additional decimal precision internally and rounds only the displayed result.
What the Calculator Does Not Tell You
Karat determines total gold content. It does not specify whether the remaining alloy is primarily silver, copper, zinc, palladium or another metal. Actual alloy chemistry depends on the intended color and physical properties.
Frequently Asked Questions
How much pure gold is in 22K gold?
Approximately 91.6667% by mass under the standard karat relationship.
How much pure gold is in 18K gold?
75% by mass.
How much pure gold is in 14K gold?
Approximately 58.3333% by mass.
Does 24K gold contain alloy metals?
The theoretical non-gold portion is zero.
How is alloy weight calculated?
Total weight minus fine-gold weight.