NEW YORK (Reuters) - Stock index futures added to gains on Wednesday after data showed U.S. jobless claims tumbled last week to the lowest level in more than a year, even as orders for long-lasting U.S. manufactured goods fell unexpectedly in October.

S&P 500 futures rose 7.4 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures gained 41 points, and Nasdaq 100 futures added 12 points.

(Editing by Jeffrey Benkoe)