A cutter tool includes first and second elongate members carrying a cutting blade pivotally attached with the second member and slidably attached with the first member to enable cutting a tubular workpiece with an increased mechanical advantage. The tool has a first handle having a cradle for supporting a tube to be cut, a second handle pivotally attached to the first handle, a cutter blade attached to the second handle, and a pin and slot between the cutter blade and the first handle. The slot configuration provides for displacement of the blade relative to the cradle to initially apply a higher cutting force which is followed by a transition to a lower cutting force and a higher rate of blade displacement.