That's a very general question.
If you're referring to a British shilling, it was a coin worth 1/20 of a pound sterling in the old pre-decimal currency system. Today it would be equivalent to 5 pence, or about 8¢ in US, Canadian, or Australian cents.
From a collector's viewpoint the answer is more varied. Shillings were issued for many centuries. Late-date ones generally don't have a lot of extra value but older coins may be worth a considerable amount depending on their date and design. Specific information as to date and design would be needed though.
The value of a one shilling coin depends on its age, condition, and rarity. In terms of British shillings, they are no longer in circulation since the UK adopted decimal currency in 1971. Today, a one shilling coin would be considered a collectible item rather than having monetary value.
That will depend on the country the shilling is from and its age and the condition it is in. There is a wide variety of shillings. You need someone who knows about them to look at it for you.
If it's a 1954 British shilling, it contains no silver, and one can easily be found for less than one US dollar. If it's Australian, then it's 50% silver, and is worth at least $1.50 US.
New Zealand has never issued a 20 Shilling coin.
A 1967 2 shilling coin is worth nothing really A 1967 2 shilling coin uncirculated would be worth around £1.50 maximum
The Australian One Shilling coin was replaced by a 10 cent coin in 1966 at Australia's conversion to decimal currency. The way currency and personal finances are currently heading in the early 21st century, there is not not much likelihood that Australia will reintroduce a One Shilling coin in 9411.
It is worth one Kenya shilling.
Such a coin does not exist. The Royal Mint did not produce any Crown (Five Shilling) coins from 1848 to 1886 inclusive.
There was no States of Jersey 1930 One Twelfth of a Shilling coin minted.
Such a coin does not exist. The first British One Shilling coins were introduced into the currency around 1550.
A British Guinea was worth 21 Shillings or One Pound and One Shilling.
The value of a 1975 Kenyan one shilling coin featuring the first president of Kenya in mint condition is 1.50 Euro, or 179.01 shillings. In good condition, the coin is worth 0.10 Euro, or 11.93 shillings.
The value of a 1967 Kenya shilling depends on the condition of the coin. Since the coin is not rare, it is only worth approximately $2.00 (as of 2014).
There were no States of Jersey One Twelfth of a Shilling coin issued from 1895 to 1908 inclusive.
The Cyprus Two Shilling coin was only issued in 1947 and 1949 as was the Cyprus Shilling coin. The Shilling coin replaced the 9 Piastre coin and the Two Shilling coin replaced the 18 Piastre coin. Cyprus changed to a decimal currency in 1955. 50 Mils to the Shilling and 1,000 Mils to the Pound.