Free gold calculator

Free Gold Karat Calculator

A gold karat calculator converts karat into purity percentage and pure gold content so you can estimate how much fine gold and intrinsic value your item contains.

Enter a weight in grams or ounces, pick a karat from 24K to 10K, and add today's pure-gold price per gram to compare purity, fine-gold weight, and estimated value on one screen.

Calculator inputs

Use the current 24K price per gram as your fine-gold benchmark.

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Gold weight

Unit

Karat

Current gold price per gram (24K, EGP)

This is an intrinsic gold-value estimate. Jewelry labor, dealer spread, and taxes are not included.

Purity and value results

Based on 21K purity and your 24K price input.

21K selected

Estimated value

EGP 47,250.00

8.75 g of fine gold × EGP 5,400.00 per gram.

Purity percentage

87.50%

21K means 21 parts gold out of 24.

Pure gold weight

8.75 g

8.75 grams of fine gold

Gross gold weight

10.00 g

Equivalent to 10.00 grams.

Alloy weight

1.25 g

The non-gold portion that improves strength and wear.

Value per gross gram

EGP 4,725.00

A quick benchmark for the current 21K alloy.

Purity bar

Gold 87.50% / Alloy 12.50%

Formula: gross weight × purity ratio = pure gold weight.

Gold karat converter

Compare the same 10.00 gram item across common karats.

Current reference: EGP 5,400.00 per gram of 24K

How to use this tool

1
Enter the total item weight and choose grams or troy ounces.
2
Select the karat you want to evaluate to apply the right purity ratio.
3
Add the current 24K gold price per gram to estimate intrinsic value.
4
Use the comparison cards and common-weight table to convert between karats quickly.

Common weight reference

A fast lookup table for standard 21K weights.

Using 21K at EGP 5,400.00/g

Gross weight	Grams	Pure gold	Estimated value
1.00 g	1.00 g	0.875 g	EGP 4,725.00
5.00 g	5.00 g	4.375 g	EGP 23,625.00
10.00 g	10.00 g	8.75 g	EGP 47,250.00
20.00 g	20.00 g	17.50 g	EGP 94,500.00
31.10 g	31.10 g	27.2125 g	EGP 146,947.50
50.00 g	50.00 g	43.75 g	EGP 236,250.00

Frequently asked questions

What does a gold karat calculator do?

A gold karat calculator converts karat into a purity percentage so you can estimate how much fine gold is inside a ring, coin, bar, or bracelet. It helps compare alloys like 21K, 18K, and 14K on the same weight basis.

How do you calculate pure gold content from karat?

Divide the karat by 24 to get the purity ratio, then multiply that ratio by the item's total weight. For example, 10 grams of 21K gold contains 10 × 0.875 = 8.75 grams of pure gold.

Should I enter the 24K price per gram or my jewelry selling price?

Enter the current pure-gold or 24K price per gram if you want a clean fine-gold estimate. Jewelry retail prices often include making charges, taxes, and dealer spread, so they should not be used as the purity reference.

Does the ounce option use regular ounces or troy ounces?

The calculator uses troy ounces, which are standard for precious metals. One troy ounce equals 31.1035 grams, not the 28.35 grams used in regular avoirdupois ounces.

Does the estimated value include making charges or taxes?

No. The value shown here is an intrinsic gold-content estimate based on purity and the pure-gold price per gram. Store premiums, workmanship, taxes, and buyback discounts are excluded.

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