An mBTC, or MilliBitcoin, is equivalent to .001BTC or one thousandth of a bitcoin.
You can view our price quotation per 1 BTC by simply clicking on the price. Clicking it again will switch it back to the 1 mBTC price.
You can also manually compute for it, if you wish, by multiplying by 1000 (e.g. the amount you wish to purchase x price per mBTC x 1000).