Powers of 10^{3} meters 
equal to... 
example 
orders of magnitude 
1 attometer 
39 x 10^{18} inches 
 
1 am, 10 am, 100 am 
1 femtometer 
39 x 10^{15} inches 
 
1 fm, 10 fm, 100 fm 
1 picometer 
39 x 10^{12} inches 
1 Ångström = 100 pm 
1 pm, 10 pm, 100 pm 
1 nanometer 
39 x 10^{9} inches 
wavelengths of visible light 
1 nm, 10 nm, 100 nm 
1 micrometer 
39 x 10^{6} inches 
 
1 µm, 10 µm, 100 µm 
1 millimeter 
0.039 inches 
inch = 25.4 mm foot = 305 mm yard = 914 mm 
1 mm, 1 cm, 10 cm 
1 meter 
39 inches 
 
1 m, 10 m, 100 m 
1 kilometer 
0.62 miles 
mile = 1.6 km 
1 km, 10 km, 100 km 
1 000 km 
621 miles 
3 480 km  diameter of the Moon 13 000 km  diameter of Earth 40 000 km  circumference of Earth 
10^{6} m, 10^{7} m, 10^{8} m 
1 million km 
621 thousand miles 
astronomical unit = 150 million km 
10^{9} m, 10^{10} m, 10^{11} m 
10^{9} km 
621 million miles 
 
10^{12} m, 10^{13} m, 10^{14} m 
10^{12} km 
621 x 10^{9} miles 
light year = 9.5 x 10^{15} m parsec = 3.1 x 10^{16} m

10^{15} m , 10^{16} m , 10^{17} m 
10^{15} km 
621 x 10^{12} miles 
 
10^{18} m , 10^{19} m , 10^{20} m 
10^{18} km 
621 x 10^{15} miles 
 
10^{21} m , 10^{22} m , 10^{23} m 
10^{21} km 
621 x 10^{18} miles 
 
10^{24} m , 10^{25} m , 10^{26} m 