Prefix SYMBOL NUMERICAL EQUIVALENT kilo (k) = 1,000 or 1x103 (1 X 103 = 10 X 10 X 10) deci (d) = 1/10th or 0.1 or 1x10-1 centi (c) = 1/100th or 0.01 or 1x10-2 (note that 1 x 10P-2P = 0.1 x 0.1) milli (m) = 1/1000th or 0.001 or 1x10P-3 micro () = 1/1,000,000th or 0.000001 or 1x10-6 nano (n) = 0.000000001 or 1x10-9 femto (f) = 0.000000000000001 or 1x10-15