Question: are mm the same as cm?
Answer: One mm is one "millimeter" or one one-thousandth of a meter (1 mm = 1/1000 m). One cm is one "centimeter" or one one-hundredth of a meter (1 cm = 1/100 m). Therefore, 1 cm = 10 mm. ... With SI, "milli" always means "one-thousandths" and "centi" always means "one-hundredths".