26.5 pence
This is not accurate. It depends on the year of the money. If the money was from the time when coins were .925 silver, then 12 shillings and sixpence would be worth 20 pounds, 62 pence in today's money (as of 1/18/2016) assuming you don't add any numismatic value on top of that. .500 silver coins would be worth 11 pounds, 15 pence. Even base metal coins would have to be put through an inflation calculator to arrive at an accurate amount in today's money.
A Halfcrown is the eqivalent of Two Shillings and Sixpence. A Crown was Five Shillings.
The British Military Authority Two Shillings and Sixpence note was issued from 1942 for the duration of WW2 and for the subsequent occupation forces. A British Military Authority Two Shillings and Sixpence note, in very good condition, might fetch anything up to £12 GBP. A reputable coin dealer will be able to more accurately identify the note and make a valuation.
Two Shillings and Sixpence does not have a value in dollars or any other currency. It is part of a long redundant or obsolete currency. The value of Two Shillings and Sixpence was represented by the Halfcrown coin until Britains decimalisation in 1971 when the coin was withdrawn along with most other British predecimal coins. At decimalisation, the value converted to 12.5 New Pence. In 1971, Two Shillings and Sixpence had the purchasing power of about £2.84 GBP today. In 1971, Two Shillings and Sixpence had the purchasing power of about $4.57 USD today. NOTE - This historical conversion is the result of many calculations and considerations by a purpose designed program for which I can take no credit. The resulting answer should only be regarded as an approximation.
The sign for the British Shilling was an S if a sign was required. £1/2/6 or £1/2/6d represented One Pound, Two Shillings and Sixpence. The Shilling value is between the Pound value and the Penny value, so it does not need a sign. The position of the 2 makes the value Two Shillings. 2/6d represented Two Shillings and Sixpence. The Shilling value precedes the Penny value, so it does not need a sign. The position of the 2 makes the value Two Shillings. If the need arose to indicate an even Shilling value, it was written as 2/-, indicating Two Shillings and zero Pence or, 2S, indicating Two Shillings.
The sign for the British Shilling was an S if a sign was required. £1/2/6 or £1/2/6d represented One Pound, Two Shillings and Sixpence. The Shilling value is between the Pound value and the Penny value, so it does not need a sign. The position of the 2 makes the value Two Shillings. 2/6d represented Two Shillings and Sixpence. The Shilling value precedes the Penny value, so it does not need a sign. The position of the 2 makes the value Two Shillings. If the need arose to indicate an even Shilling value, it was written as 2/-, indicating Two Shillings and zero Pence or, 2S, indicating Two Shillings.
British silver coins minted in 1894 included the Crown (Five Shillings), Halfcrown (Two Shillings and Sixpence), Florin (Two Shillings), Shilling, Sixpence and Threepence.
You refer to a redundant or obsolete currency which no longer has an exchange rate with any other currency.Thirty-two and Sixpence, would be 32 Shillings and Sixpence (32/6) or, One Pound, Twelve Shillings and Sixpence (£1/12/6).At Britain's conversion to decimal currency in 1971, £1/12/6 in the old currency would have become £1.62 in the new currency.One Pound remained One Pound.Twelve Shillings converted to 60 New Pence.Sixpence converted to 2.5 New Pence for which there was no equivalent new coin.
The coins of James I are as follows -First Coinage 1603-1604Gold coins -Sovereign (20 Shillings)Half-Sovereign (10 Shillings)Crown (5 Shillings)Halfcrown (2 Shillings and Sixpence - 2/6)Silver coins -Crown (5 Shillings)Halfcrown (2 Shillings and Sixpence - 2/6)ShillingSixpenceHalfgroatPennyHalfpennySecond Coinage 1604-1619Gold coins -Rose-ryal (30 Shillings)Unite (20 Shillings)Spur-Ryal (15 Shillings)Angel (10 Shillings)Half-angel (5 Shillings)Double-crownBritain crownThistle crown (4 Shillings)HalfcrownSilver coins -Crown (5 Shillings)Halfcrown (2 Shillings and Sixpence - 2/6)ShillingSixpenceHalfgroatPennyHalfpennyCopper coins -FarthingThird Coinage 1619-1625Gold coins -Rose-ryal (30 Shillings)Laurel (20 Shillings)Spur-Ryal (15 Shillings)Angel (10 Shillings)Half-laurel (10 Shillings)Quarter-laurel (5 Shillings)Silver coins -Crown (5 Shillings)Halfcrown (2 Shillings and Sixpence - 2/6)ShillingSixpenceHalfgroatPennyHalfpennyCopper coins -FarthingIn 1612, all coins had their value increased by 10%, but seem to have reverted to their original values by 1619.
Pound; l (lower-case L) or more commonly, £ with an extra cross-bar. Shilling (i.e. 12 pennies); s (lower-case), or /- if there are no 'pound' units, and no pennies. Pennies; d (lower-case). example: Two pounds, five shillings and sixpence.... £2 5s 6d five shillings.... 5/- five shillings and sixpence.... 5/6d
Twelve and a Half New Pence in decimal currency was the equivalent of a Halfcrown (Two Shillings and Sixpence or Thirty Pence) in the old currency.
A predecimal Half-Sovereign was equal to 10 Shillings. A predecimal Crown was equal to 5 Shillings. A predecimal Halfcrown was equal to 2 Shillings and Sixpence (or 2 and a half Shillings). So there would be 4 Halfcrowns in a Half-Sovereign.
You seem to have answered your own question. If you're trying to convert shillings and sixpence into modern pence, it becomes 17 pounds and 47.5 pence.