How much is 10 to 15 shillings worth today in the USA?

The British Shilling and the Shillings of most other Commonwealth countries are part of long redundant currencies which no longer have exchange rates with any other currency.

There were 20 Shillings in a Pound and 12 Pence in a Shilling.

The British currency changeover occurred in 1971.

Ten Shillings converted to 50 New Pence.

10 British Shillings in 1971 had the purchasing power of about £4.73 GBP today.

10 British Shillings in 1971 had the purchasing power of about $7.60 USD today.