A foot measuring or sizing device comprising a base platform, a heel support (28), an alignment fin (6) and a measurement scale (16). The heel support is pivotally connected to the base platform and the foot fin being slidably along an elongate slot formed in the base platform to facilitate alignment of the foot to be measured with a central axis or plane of the foot measuring or sizing device prior to determining a length, measuring a width and/or determining the amount of lift or adjustment of the foot to be measured is necessary to properly support a foot while using footwear.