Il numero romano MDIII nel sistema decimale vale: 1503.
MDIII in latino si scrive mille quingenti tres,
mentre in italiano millecinquecentotré.
MCDLXXXIV, MCDLXXXV, MCDLXXXVI, MCDLXXXVII, MCDLXXXVIII, MCDLXXXIX, MCDXC, MCDXCI, MCDXCII, MCDXCIII, MCDXCIV, MCDXCV, MCDXCVI, MCDXCVII, MCDXCVIII, MCDXCIX, MD, MDI, MDII, MDIV, MDV, MDVI, MDVII, MDVIII, MDIX, MDX, MDXI, MDXII, MDXIII, MDXIV, MDXV, MDXVI, MDXVII, MDXVIII, MDXIX, MDXX, MDXXI, MDXXII