Measure each room, multiplying length by width. You will need to buy extra material to compensate for waste when boards are trimmed or when damaged material must be cut from a board. Waste is much less with the better grades of wood. Usually, you will need 10% to 12% extra. Laying the floor diagonally or using other special patterns can increase the amount of material required by another 10%.
Don’t forget that you will also need to buy moulding, transitions and thresholds. We are happy to provide you with an accurate estimate of the material you will need when we prepare your quotation.