Abstract: A nail clipper includes a gauge which determines the length of the nail being cut. The gauge is held by friction against one of the jaws of the clipper, and can slide back and forth to a desired position. The gauge includes a flange against which the fingertip is brought into abutment. In another embodiment, the flange includes a recess which mates with a fingertip. The latter embodiment prevents accidental cutting of the fingertip, and is especially suitable for use in cutting children's fingernails. In still another embodiment, the nail clipper resembles a guillotine, and a U-shaped gauge member slides back and forth in a holding device to determine the length of the nail to be cut. A finger holder connected to the gauge member provides secure contact between the fingertip and the gauge member. The invention substantially improves the efficiency with which artificial nails can be cut precisely to a desired length.