Stock index futures slightly added to gains after data showed retail sales recorded their largest gain in five months in February.

S&P 500 futures rose 7.2 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration of the contract. Dow Jones industrial average futures added 69 points and Nasdaq 100 futures climbed 15.25 points.

(Reporting By Chuck Mikolajczak; Editing by Padraic Cassidy)