Estimate the underlying value of gold from its weight, purity and a
reference gold price. Enter a gold price per gram, kilogram, troy ounce,
tola, pennyweight or grain, then select the purity of the gold you are
valuing. The calculator converts the weight, determines the estimated
pure-gold content and calculates its theoretical metal value.
How the Gold Value Calculator Works
The value of gold depends primarily on three inputs: the quantity of gold,
its purity and the applicable reference gold price. A heavier item
contains more gold, while a higher-purity item contains a greater
proportion of pure gold at the same total weight.
This calculator first converts the entered weight into grams. It then
calculates the pure-gold content based on the selected karat and converts
the supplied gold price into a compatible pure-gold price per gram.
Gold value = Pure gold weight × Pure gold price per gram
Keeping the weight and price calculations separate makes the result
consistent even when the user enters a troy-ounce, tola, pennyweight or
grain quotation instead of a gram price.
Gold Value Formula
If the gold weight is already expressed in grams, the pure-gold content
can be estimated from the karat.
Pure gold weight = Total weight × (Karat ÷ 24)
For example, 10 grams of nominal 22K gold represents a theoretical
pure-gold content of:
10 g × (22 ÷ 24) = 9.1667 g of pure gold
The theoretical pure-gold content is then multiplied by the applicable
pure-gold price per gram.
Gold Purity and Value
Karat indicates the nominal gold fraction out of 24 parts. This is why two
pieces with the same total weight can have different theoretical gold
values.
| Purity |
Nominal Gold Fraction |
Gold Content per 10 g |
| 24K |
100.00% |
10.0000 g |
| 23K |
95.83% |
9.5833 g |
| 22K |
91.67% |
9.1667 g |
| 21K |
87.50% |
8.7500 g |
| 20K |
83.33% |
8.3333 g |
| 18K |
75.00% |
7.5000 g |
| 14K |
58.33% |
5.8333 g |
| 10K |
41.67% |
4.1667 g |
| 9K |
37.50% |
3.7500 g |
These are nominal karat fractions. Actual fineness of a physical item
should be established through appropriate testing or documentation rather
than assumed solely from appearance.
Gold Weight Units Supported
Gold can be weighed using several systems. The calculator supports the
most useful units for gold valuation and converts each into grams before
performing the calculation.
| Unit |
Approximate Weight |
Common Context |
| Gram |
1 g |
Jewellery and general gold measurement |
| Kilogram |
1,000 g |
Large bullion quantities |
| Troy ounce |
31.1034768 g |
International precious-metal quotations |
| Tola |
11.6638125 g |
Traditional bullion and jewellery markets |
| Pennyweight |
1.55517384 g |
Jewellery and precious-metal trade |
| Grain |
0.06479891 g |
Small troy-weight subdivisions |
Gold Value of Jewellery
The calculator can provide an estimate of the underlying gold component of
a jewellery item. This can be useful when comparing a piece's metal value
with a quoted selling price or when estimating the value of a known gold
weight.
The result should not automatically be interpreted as the item's resale
price. Finished jewellery can include design, workmanship, gemstones,
brand premiums, taxes, wastage and other costs.
Metal value
Represents the theoretical value of the gold content based on the
supplied reference price.
Retail value
Can be considerably higher because of manufacturing, design,
distribution, taxes, branding and retailer margins.
Resale or scrap value
Can be lower than theoretical metal value because buyers may account
for testing, refining, processing, spreads and their own margins.
Gold Value for Scrap
For scrap gold, the most important inputs are usually the total weight,
actual purity and the applicable gold reference price. The calculator can
provide a theoretical starting point for evaluating these quantities.
Scrap gold metal value ≈ Total weight × purity fraction × pure-gold price
Actual scrap offers can differ from this theoretical figure. A buyer may
need to test the material, separate alloys, account for refining losses
and cover operating costs before recovering the gold.
Gold Value vs Gold Selling Price
A calculated gold value is not necessarily the amount a person will pay
for a finished gold product. Gold value describes the underlying metal
component under the assumptions entered into the calculator.
A jewellery selling price may include making charges, gemstones, design
premiums, taxes, packaging, retailer margins and other expenses. Likewise,
a dealer buying gold may quote below the theoretical metal value because
of testing, refining, handling and commercial spreads.
Use the result as a reference for the underlying gold content, not as a
guaranteed purchase, resale or appraisal price.
Why the Gold Price Purity Setting Matters
The reference gold price itself has a purity basis. For example, a market
quotation may represent fine gold close to 24K, while a jewellery item may
be 22K or 18K.
This calculator therefore asks for both the item's Gold
Purity and the Gold Price Purity. This avoids
treating a lower-purity quotation as though it were a fine-gold price.
Pure-gold price per gram =
Reference price per gram ÷ reference purity fraction
The resulting pure-gold price is then multiplied by the item's pure-gold
weight.
Practical Example
Suppose a jewellery item weighs 10 grams and is nominally 22K. If the
supplied reference price is a 24K gold price per gram, the calculator first
determines the theoretical pure-gold content.
10 × (22 ÷ 24) = 9.1667 g pure gold
If the 24K reference price were 100 currency units per gram, the estimated
metal value would therefore be approximately:
9.1667 × 100 = 916.67 currency units
This example demonstrates the metal-value calculation only. It does not
represent a dealer's buyback price or a jewellery item's retail price.
Important Limitations
This calculator does not retrieve a live gold price. The reference price
must be entered by the user.
Purity is calculated from the selected nominal karat. The tool does not
assay or authenticate physical gold.
Gold jewellery may contain solder, stones, non-gold components or other
materials that affect its actual recoverable gold content.
Actual buying and selling prices can differ because of market spreads,
dealer margins, refining costs, taxes, premiums, making charges and other
commercial considerations.
For substantial transactions, use an appropriate assay, documented
fineness and current market quotation rather than relying solely on a
calculator estimate.
Frequently Asked Questions
How is gold value calculated?
The calculator converts the entered weight into grams, determines the
theoretical pure-gold content from the selected purity, converts the supplied
gold price into a compatible pure-gold price and multiplies the two values.
Does gold purity affect its value?
Yes. For the same total weight, higher-purity gold contains more pure gold
and therefore has a higher theoretical metal value when the same fine-gold
reference price is used.
What gold purities does the calculator support?
It supports common karat values from 9K through 24K, including 10K, 14K,
18K, 20K, 21K, 22K and 23K.
Can I calculate the value of gold jewellery?
Yes. Enter the jewellery weight and purity and provide an appropriate gold
reference price. The result estimates the underlying metal value.
Can I calculate scrap gold value?
Yes. The calculator can estimate the theoretical metal value of scrap gold
from its weight, purity and reference gold price.
What weight units can I use?
You can use grams, kilograms, troy ounces, tola, pennyweight or grains.
Is this a live gold price calculator?
No. The gold price is supplied manually. The calculator performs the
mathematical valuation using that reference price.
Does the calculator include jewellery making charges?
No. The result represents the estimated underlying gold metal value. Making
charges, gemstones, taxes, wastage and retailer margins are not automatically
included.