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Weight and purity calculator

Gold value calculator

Calculate an estimated gold content value using weight, unit, karat and a transparent USD-per-troy-ounce reference.

Gold value estimateLoading market reference…

Gold details

Enter the weight and hallmark. Buyer offer is optional.

grams
$
$USD / troy oz
You can replace this number

Estimated gold value

Metal content estimate before buyer costs.

$0
Reference valueNot a purchase offer
Pure gold content0 g
Value per item gram$0
70% payout reference$0
90% payout reference$0

For collectible coins, branded jewelry, antiques or gemstones, metal value may be only one part of total value.

Choose the right purity

Karat describes how much pure gold is present in an alloy. Select the hallmark stamped on the item when available.

0.417 purity factor10K / 417Value guide →0.585 purity factor14K / 585Value guide →0.750 purity factor18K / 750Value guide →0.916 purity factor22K / 916Value guide →

The calculation

Weight in grams × purity × (USD gold price per troy ounce ÷ 31.1034768)

The result estimates only the contained gold value. It does not establish the retail price, resale price or amount a buyer must pay.

Supported weight units

  • Gram: 1 gram
  • Pennyweight: approximately 1.55517 grams
  • Troy ounce: approximately 31.10348 grams
  • Avoirdupois ounce: approximately 28.34952 grams

How to improve accuracy

Use a calibrated scale, verify the hallmark, subtract stones and non-gold parts, and confirm the displayed market reference before making a decision.