On a percentage basis, silver items usually carry a bigger premium than gold. That is why the calculator’s silver limits are wider.
The cost of making them
A 1 oz silver coin holds far less value than a 1 oz gold coin, but making it costs about the same. The fixed cost is a bigger slice of a cheaper product.
Handling and storage
Silver is bulkier for its value, so shipping, packaging and storage cost more per pound of value.
VAT
In the UK silver normally carries 20% VAT and gold doesn’t. That makes the all-in cost gap bigger. See VAT on bullion.
What to do with that
Compare like with like: a silver coin against other silver coins, a gold coin against other gold coins. Try the calculator with your quote.
Not financial advice. See the terms.