We hope that this conversion chart will be of use to some modellers. Should you spot an error in the figures, please let us know so that we can update the tables.
DISCLAIMER: Whilst every effort has been made to make sure that the conversions and formulae on this page are both accurate and correct, we take no responsibility for any inaccurate or incorrect information.
Inches |
Metric |
Inches |
Metric |
Inches |
Metric |
Fraction |
Decimal |
mm |
|
Fraction |
Decimal |
mm |
|
Fraction |
Decimal |
mm |
|
0.0039 |
0.1000 |
|
|
0.5512 |
14.0000 |
|
|
1.8898 |
48.0000 |
|
0.0079 |
0.2000 |
|
9/16 |
0.5625 |
14.2875 |
|
|
1.9291 |
49.0000 |
|
0.0118 |
0.3000 |
|
|
0.5709 |
14.5000 |
|
|
1.9685 |
50.0000 |
1/64 |
0.0156 |
0.3969 |
|
37/64 |
0.5781 |
14.6844 |
|
2 |
2.0000 |
50.8000 |
|
0.0157 |
0.4000 |
|
|
0.5906 |
15.0000 |
|
|
2.0079 |
51.0000 |
|
0.0197 |
0.5000 |
|
19/32 |
0.5938 |
15.0813 |
|
|
2.0472 |
52.0000 |
|
0.0236 |
0.6000 |
|
39/64 |
0.6094 |
15.4781 |
|
|
2.0866 |
53.0000 |
|
0.0276 |
0.7000 |
|
|
0.6102 |
15.5000 |
|
|
2.1260 |
54.0000 |
1/32 |
0.0313 |
0.7938 |
|
5/8 |
0.6250 |
15.8750 |
|
|
2.1654 |
55.0000 |
|
0.0315 |
0.8000 |
|
|
0.6299 |
16.0000 |
|
|
2.2047 |
56.0000 |
|
0.0354 |
0.9000 |
|
41/64 |
0.6406 |
16.2719 |
|
|
2.2441 |
57.0000 |
|
0.0394 |
1.0000 |
|
|
0.6496 |
16.5000 |
|
2 1/4 |
2.2500 |
57.1500 |
|
0.0433 |
1.1000 |
|
21/32 |
0.6563 |
16.6688 |
|
|
2.2835 |
58.0000 |
3/64 |
0.0469 |
1.1906 |
|
|
0.6693 |
17.0000 |
|
|
2.3228 |
59.0000 |
|
0.0472 |
1.2000 |
|
43/64 |
0.6719 |
17.0656 |
|
|
2.3622 |
60.0000 |
|
0.0512 |
1.3000 |
|
11/16 |
0.6875 |
17.4625 |
|
|
2.4016 |
61.0000 |
|
0.0551 |
1.4000 |
|
|
0.6890 |
17.5000 |
|
|
2.4409 |
62.0000 |
|
0.0591 |
1.5000 |
|
45/64 |
0.7031 |
17.8594 |
|
|
2.4803 |
63.0000 |
1/16 |
0.0625 |
1.5875 |
|
|
0.7087 |
18.0000 |
|
2 1/2 |
2.5000 |
63.5000 |
|
0.0630 |
1.6000 |
|
23/32 |
0.7188 |
18.2563 |
|
|
2.5197 |
64.0000 |
|
0.0669 |
1.7000 |
|
|
0.7283 |
18.5000 |
|
|
2.5591 |
65.0000 |
|
0.0709 |
1.8000 |
|
47/64 |
0.7344 |
18.6531 |
|
|
2.5984 |
66.0000 |
|
0.0748 |
1.9000 |
|
|
0.7480 |
19.0000 |
|
|
2.6378 |
67.0000 |
5/64 |
0.0781 |
1.9844 |
|
3/4 |
0.7500 |
19.0500 |
|
|
2.6772 |
68.0000 |
|
0.0787 |
2.0000 |
|
49/64 |
0.7656 |
19.4469 |
|
|
2.7165 |
69.0000 |
|
0.0827 |
2.1000 |
|
|
0.7677 |
19.5000 |
|
2 3/4 |
2.7500 |
69.8500 |
|
0.0866 |
2.2000 |
|
25/32 |
0.7813 |
19.8438 |
|
|
2.7559 |
70.0000 |
|
0.0906 |
2.3000 |
|
|
0.7874 |
20.0000 |
|
|
2.7953 |
71.0000 |
3/32 |
0.0938 |
2.3813 |
|
51/64 |
0.7969 |
20.2406 |
|
|
2.8346 |
72.0000 |
|
0.0945 |
2.4000 |
|
|
0.8071 |
20.5000 |
|
|
2.8740 |
73.0000 |
|
0.0984 |
2.5000 |
|
13/16 |
0.8125 |
20.6375 |
|
|
2.9134 |
74.0000 |
7/64 |
0.1094 |
2.7781 |
|
|
0.8268 |
21.0000 |
|
|
2.9528 |
75.0000 |
|
0.1181 |
3.0000 |
|
53/64 |
0.8281 |
21.0344 |
|
|
2.9921 |
76.0000 |
1/8 |
0.1250 |
3.1750 |
|
27/32 |
0.8438 |
21.4313 |
|
3 |
3.0000 |
76.2000 |
|
0.1378 |
3.5000 |
|
|
0.8465 |
21.5000 |
|
|
3.0315 |
77.0000 |
9/64 |
0.1406 |
3.5719 |
|
55/64 |
0.8594 |
21.8281 |
|
|
3.0709 |
78.0000 |
5/32 |
0.1563 |
3.9688 |
|
|
0.8661 |
22.0000 |
|
|
3.1102 |
79.0000 |
|
0.1575 |
4.0000 |
|
7/8 |
0.8750 |
22.2250 |
|
|
3.1496 |
80.0000 |
11/64 |
0.1719 |
4.3656 |
|
. |
0.8858 |
22.5000 |
|
|
3.1890 |
81.0000 |
|
0.1772 |
4.5000 |
|
57/64 |
0.8906 |
22.6219 |
|
|
3.2283 |
82.0000 |
3/16 |
0.1875 |
4.7625 |
|
|
0.9055 |
23.0000 |
|
|
3.2677 |
83.0000 |
|
0.1969 |
5.0000 |
|
29/32 |
0.9063 |
23.0188 |
|
|
3.3071 |
84.0000 |
13/64 |
0.2031 |
5.1594 |
|
59/64 |
0.9219 |
23.4156 |
|
|
3.3465 |
85.0000 |
|
0.2165 |
5.5000 |
|
|
0.9252 |
23.5000 |
|
|
3.3858 |
86.0000 |
7/32 |
0.2188 |
5.5563 |
|
15/16 |
0.9375 |
23.8125 |
|
|
3.4252 |
87.0000 |
15/64 |
0.2344 |
5.9531 |
|
|
0.9449 |
24.0000 |
|
|
3.4646 |
88.0000 |
|
0.2362 |
6.0000 |
|
61/64 |
0.9531 |
24.2094 |
|
3 1/2 |
3.5000 |
88.9000 |
1/4 |
0.2500 |
6.3500 |
|
|
0.9646 |
24.5000 |
|
|
3.5039 |
89.0000 |
|
0.2559 |
6.5000 |
|
31/32 |
0.9688 |
24.6063 |
|
|
3.5433 |
90.0000 |
17/64 |
0.2656 |
6.7469 |
|
|
0.9843 |
25.0000 |
|
|
3.5827 |
91.0000 |
|
0.2756 |
7.0000 |
|
63/64 |
0.9844 |
25.0031 |
|
|
3.6220 |
92.0000 |
9/32 |
0.2813 |
7.1438 |
|
1 |
1.0000 |
25.4000 |
|
|
3.6614 |
93.0000 |
|
0.2953 |
7.5000 |
|
|
1.0039 |
25.5000 |
|
|
3.7008 |
94.0000 |
19/64 |
0.2969 |
7.5406 |
|
|
1.0236 |
26.0000 |
|
|
3.7402 |
95.0000 |
5/16 |
0.3125 |
7.9375 |
|
|
1.0433 |
26.5000 |
|
|
3.7795 |
96.0000 |
|
0.3150 |
8.0000 |
|
|
1.0630 |
27.0000 |
|
|
3.8189 |
97.0000 |
21/64 |
0.3281 |
8.3344 |
|
|
1.0827 |
27.5000 |
|
|
3.8583 |
98.0000 |
|
0.3346 |
8.5000 |
|
|
1.1024 |
28.0000 |
|
|
3.8976 |
99.0000 |
11/32 |
0.3438 |
8.7313 |
|
|
1.1220 |
28.5000 |
|
|
3.9370 |
100.0000 |
|
0.3543 |
9.0000 |
|
|
1.1417 |
29.0000 |
|
4 |
4.0000 |
101.6000 |
23/64 |
0.3594 |
9.1281 |
|
|
1.1614 |
29.5000 |
|
|
4.3307 |
110.0000 |
|
0.3740 |
9.5000 |
|
|
1.1811 |
30.0000 |
|
4 1/2 |
4.5000 |
114.3000 |
3/8 |
0.3750 |
9.5250 |
|
|
1.2205 |
31.0000 |
|
|
4.7244 |
120.0000 |
25/64 |
0.3906 |
9.9219 |
|
1 1/4 |
1.2500 |
31.7500 |
|
5 |
5.0000 |
127.0000 |
|
0.3937 |
10.0000 |
|
|
1.2598 |
32.0000 |
|
|
5.1181 |
130.0000 |
13/32 |
0.4063 |
10.3188 |
|
|
1.2992 |
33.0000 |
|
|
5.5118 |
140.0000 |
|
0.4134 |
10.5000 |
|
|
1.3386 |
34.0000 |
|
|
5.9055 |
150.0000 |
27/64 |
0.4219 |
10.7156 |
|
|
1.3780 |
35.0000 |
|
6 |
6.0000 |
152.4000 |
|
0.4331 |
11.0000 |
|
|
1.4173 |
36.0000 |
|
|
6.2992 |
160.0000 |
7/16 |
0.4375 |
11.1125 |
|
|
1.4567 |
37.0000 |
|
|
6.6929 |
170.0000 |
|
0.4528 |
11.5000 |
|
|
1.4961 |
38.0000 |
|
|
7.0866 |
180.0000 |
29/64 |
0.4531 |
11.5094 |
|
1 1/2 |
1.5000 |
38.1000 |
|
|
7.4803 |
190.0000 |
15/32 |
0.4688 |
11.9063 |
|
|
1.5354 |
39.0000 |
|
|
7.8740 |
200.0000 |
|
0.4724 |
12.0000 |
|
|
1.5748 |
40.0000 |
|
8 |
8.0000 |
203.2000 |
31/64 |
0.4844 |
12.3031 |
|
|
1.6142 |
41.0000 |
|
|
9.8425 |
250.0000 |
|
0.4921 |
12.5000 |
|
|
1.6535 |
42.0000 |
|
10 |
10.0000 |
254.0000 |
1/2 |
0.5000 |
12.7000 |
|
|
1.6929 |
43.0000 |
|
20 |
20.0000 |
508.0000 |
|
0.5118 |
13.0000 |
|
|
1.7323 |
44.0000 |
|
30 |
30.0000 |
762.0000 |
33/64 |
0.5156 |
13.0969 |
|
1 3/4 |
1.7500 |
44.4500 |
|
40 |
40.0000 |
1016.0000 |
17/32 |
0.5313 |
13.4938 |
|
|
1.7717 |
45.0000 |
|
60 |
60.0000 |
1524.0000 |
|
0.5315 |
13.5000 |
|
. |
1.8110 |
46.0000 |
|
80 |
80.0000 |
2032.0000 |
35/64 |
0.5469 |
13.8906 |
|
|
1.8504 |
47.0000 |
|
100 |
100.0000 |
2540.0000 |
Length Formulae |
|
Weight Formulae |
To convert |
Multiply by |
|
To convert |
Multiply by |
Inches to centimetres |
2.54 |
|
Ounces to grams |
28.3495 |
Centimetres to inches |
0.3937 |
|
Grams to ounces |
0.03527 |
Feet to metres |
0.3048 |
|
Pounds to grams |
453.59 |
Metres to feet |
3.2808 |
|
Grams to pounds |
0.002204 |
Yards to metres |
0.9144 |
|
Pounds to kilograms |
0.45359 |
Metres to yards |
1.0936 |
|
Kilograms to pounds |
2.2046 |
Miles to kilometres |
1.6093 |
|
Tons (Long) to kilograms |
1016.0469 |
Kilometres to miles |
0.6213 |
|
Kilograms to tons (Long) |
0.000984 |
Area Formulae |
|
Volume Formulae |
To convert |
Multiply by |
|
To convert |
Multiply by |
Sq inches to sq centimetres |
6.4516 |
|
Cu inches to Cu centimetres |
16.387 |
Sq centimetres to sq inches |
0.155 |
|
Cu centimetres to Cu inches |
0.06102 |
Sq feet to sq metres |
0.0929 |
|
Cu feet to Cu metres |
0.02831 |
Sq metres to sq feet |
10.7639 |
|
Cu metres to Cu feet |
35.3147 |
Sq yards to sq metres |
0.8361 |
|
Cu yards to Cu metres |
0.76455 |
Sq metres to sq yards |
1.1959 |
|
Cu metres to Cu yards |
1.30795 |
Sq metres to sq kilometres |
2.5899 |
|
Capacity Formulae |
Sq kilometres to sq miles |
0.3861 |
|
To convert |
Multiply by |
Acres to hectares |
0.4046 |
|
Gallons to litres |
4.546 |
Hectares to acres |
2.471 |
|
Litres to gallons |
0.2199 |