Need help ASAP Optical question? my gles prescription is OD -3.00 and OS -3.00 ....?

There is no website that does these conversions. The BC and DIA are measurements that are dependent on the curvature of your eyes. This can only be measured by an Optician using a keratometer. there is no way to derive these measurements from your sight test prescription. You will require a valid contact lens specification before anyone can legally supply you with contact lenses. This is required even if you are thinking of buying contact lenses online