Technical Information

Unit Equivalents and Conversions

Decimal and Millimeter Equivalents

      DECIMALS   MM
    1 0.015625 -- 0.397
    64
  1   0.031250 -- 0.794
  32  
    3 0.046875 -- 1.191
    64
1     0.062500 -- 1.588
16    
    5 0.078125 -- 1.984
    64
  3   0.093750 -- 2.381
  32  
    7 0.109375 -- 2.778
    64
1     0.125000 -- 3.175
8    
    9 0.140625 -- 3.572
    64
  5   0.156250 -- 3.969
  32  
    11 0.171875 -- 4.366
    64
3     0.187500 -- 4.763
16    
    13 0.203125 -- 5.159
    64
  7   0.218750 -- 5.556
  32  
    15 0.234375 -- 5.953
    64
1     0.250000 -- 6.350
4    
    17 0.265625 -- 6.747
    64
  9   0.281250 -- 7.144
  32  
    19 0.296875 -- 7.541
    64
5     0.312500 -- 7.938
16    
    21 0.328125 -- 8.334
    64
  11   0.343750 -- 8.731
  32  
    23 0.359375 -- 9.128
    64
3     0.375000 -- 9.525
8    
    25 0.390625 -- 9.922
    64
  13   0.406250 -- 10.319
  32  
    27 0.421875 -- 10.716
    64
7     0.437500 -- 11.113
16    
    29 0.453125 -- 11.509
    64
  15   0.468750 -- 11.906
  32  
    31 0.484375 -- 12.303
    64
1     0.500000 -- 12.700
2    
           
1 mm = .03937”
      DECIMALS   MM
    33 0.515625 -- 13.097
    64
  17   0.531250 -- 13.494
  32  
    35 0.546875 -- 13.891
    64
9     0.562500 -- 14.288
16    
    37 0.578125 -- 14.684
    64
  19   0.593750 -- 15.081
  32  
    39 0.609375 -- 15.478
    64
5     0.625000 -- 15.875
8    
    41 0.640625 -- 16.272
    64
  21   0.656250 -- 16.669
  32  
    43 0.671875 -- 17.066
    64
11     0.687500 -- 17.463
16    
    45 0.703125 -- 17.859
    64
  23   0.718750 -- 18.256
  32  
    47 0.734375 -- 18.653
    64
3     0.750000 -- 19.050
4    
    49 0.765625 -- 19.447
    64
  25   0.781250 -- 19.844
  32  
    51 0.796875 -- 20.241
    64
13     0.812500 -- 20.638
16    
    53 0.828125 -- 21.034
    64
  27   0.843750 -- 21.431
  32  
    55 0.859375 -- 21.828
    64
7     0.875000 -- 22.225
8    
    57 0.890625 -- 22.622
    64
  29   0.906250 -- 23.019
  32  
    59 0.921875 -- 23.416
    64
15     0.937500 -- 23.813
16    
    61 0.953125 -- 24.209
    64
  31   0.968750 -- 24.606
  32  
    63 0.984375 -- 25.003
    64
1     1.000000 -- 25.400
   
           
001" = .0254 mm
MM   IN MM   IN
0.1 -- 0.0039 46 -- 1.8110
0.2 -- 0.0079 47 -- 1.8504
0.3 -- 0.0118 48 -- 1.8898
0.4 -- 0.0157 49 -- 1.9291
0.5 -- 0.0197 50 -- 1.9685
0.6 -- 0.0236 51 -- 2.0079
0.7 -- 0.0276 52 -- 2.0472
0.8 -- 0.0315 53 -- 2.0866
0.9 -- 0.0354 54 -- 2.1260
1 -- 0.0394 55 -- 2.1654
2 -- 0.0787 56 -- 2.2047
3 -- 0.1181 57 -- 2.2441
4 -- 0.1575 58 -- 2.2835
5 -- 0.1969 59 -- 2.3228
6 -- 0.2362 60 -- 2.3622
7 -- 0.2756 61 -- 2.4016
8 -- 0.3150 62 -- 2.4409
9 -- 0.3543 63 -- 2.4803
10 -- 0.3937 64 -- 2.5197
11 -- 0.4331 65 -- 2.5591
12 -- 0.4724 66 -- 2.5984
13 -- 0.5118 67 -- 2.6378
14 -- 0.5512 68 -- 2.6772
15 -- 0.5906 69 -- 2.7165
16 -- 0.6299 70 -- 2.7559
17 -- 0.6693 71 -- 2.7953
18 -- 0.7087 72 -- 2.8346
19 -- 0.7480 73 -- 2.8740
20 -- 0.7874 74 -- 2.9134
21 -- 0.8268 75 -- 2.9528
22 -- 0.8661 76 -- 2.9921
23 -- 0.9055 77 -- 3.0315
24 -- 0.9449 78 -- 3.0709
25 -- 0.9843 79 -- 3.1102
26 -- 1.0236 80 -- 3.1496
27 -- 1.0630 81 -- 3.1890
28 -- 1.1024 82 -- 3.2283
29 -- 1.1417 83 -- 3.2677
30 -- 1.1811 84 -- 3.3071
31 -- 1.2205 85 -- 3.3465
32 -- 1.2598 86 -- 3.3858
33 -- 1.2992 87 -- 3.4252
34 -- 1.3386 88 -- 3.4646
35 -- 1.3780 89 -- 3.5039
36 -- 1.4173 90 -- 3.5433
37 -- 1.4567 91 -- 3.5827
38 -- 1.4961 92 -- 3.6220
39 -- 1.5354 93 -- 3.6614
40 -- 1.5748 94 -- 3.7008
41 -- 1.6142 95 -- 3.7402
42 -- 1.6535 96 -- 3.7795
43 -- 1.6929 97 -- 3.8189
44 -- 1.7323 98 -- 3.8583
45 -- 1.7717 99 -- 3.8976
      100 -- 3.9370

 Metric System/Length

Unit Metric Equivalent   US Equivalent
millimeter (mm) = 0.001   meter = 0.03937   inch
centimeter (cm) = 0.01   meter = 0.3937   inch
decimeter (dm) = 0.1   meter = 3.937   inches
METER (m) = 1   meter = 39.37   inches
dekameter (dkm) = 10.0   meters = 10.93   yards
hectometer (hm) = 100.0   meters = 328.08   feet
kilometer (km) = 1000.0   meters = 0.6214   mile

 Metric System/Weight or Mass

Unit Metric Equivalent   US Equivalent
millimeter (mg) = 0.001   gram = 0.0154   grain
centimeter (cg) = 0.01   gram = 0.1543   grain
decimeter (dg) = 0.1   gram = 1.543   grains
GRAM (g) = 1   gram = 15.43   grains
dekagram (dkg) = 10.0   grams = 0.3527   ounce avoirdupois
hectogram (hg) = 100.0   grams = 3.527   ounces avoirdupois
kilogram (kg) = 1000.0   grams = 2.2   pounds avoirdupois

  Metric System/Capacity

Unit Metric Equivalent   US Equivalent
millimeter (ml) = 0.001   liter = 0.0034   fluid ounce
centimeter (cl) = 0.01   liter = 0.338   fluid ounce
decimeter (dl) = 0.1   liter = 3.38   fluid ounces
LITER (l) = 1   liter = 1.05   liquid quarts
dekaliter (dkl) = 10.0   liters = 0.284   bushel
hectoliter (hl) = 100.0   liters = 2.837   bushels
kiloliter (kl) = 1000.0   liters = 264.18   gallon

 Metric System/Area

Unit Metric Equivalent   US Equivalent
square millimeter (mm2) = 0.000001   centare = 0.00155   square inch
square centimeter (cm2) = 0.0001   centare = 0.155   square inch
square decimeter (dm2) = 0.01   centare = 15.5   square inches
CENTARE, also (ca) = 1.0   centare = 10.76   square feet
square meter (m2)
are, also (a) = 100.0   centares = 0.0247   acre
square dekameter (dkm2)
hectare, also (ha) = 10,000.0   centares = 2.47   acres
square hectometer (hm2)
square kilometer (km2) = 1,000,000.0   centares = 0.386   square mile

 Metric System/Volume

Unit Metric Equivalent   US Equivalent
cubic millimeter (mm3) = 0.001   cubic centimeter = 0.016   minim
cubic centimeter (cc, cm3) = 0.001   cubic decimeter = 0.061   cubic inch
cubic decimeter (dm3) = 0.001   cubic meter = 61.023   cubic inches
STERE, also (s) = 1.0   cubic meter = 1.308   cubic yards
cubic meter (m3)
cubic dekameter (dkm3) = 1000.0   cubic meters = 1307.943   cubic yards
cubic hectometer (hm3) = 1,000,000.0   cubic meters = 1,307,942.8   cubic yards
cubic kilometer (km3) = 1,000,000,000.0   cubic meters = 0.25   cubic mile

  Pressure

Unit Atm. kg/cm2 lb/in2 bar (0°C) (32°F) (60°F)
1 Atmosphere 1* 1.033228 14.6959 1.013250 760* 29.921 33.934
1 kg./cm2 0.967841 1* 14.2233 0.980665* 735.559 28.959 32.843
10 lb./in.2 0.68046 0.70307 10* 0.689476 517.149 20.360 23.091
1 bar 0.986923 1.019716 14.5038 1* 750.062 29.530 33.490
1 meter Hg. (0°C) 1.31579 1.35951 19.3368 1.333224 1000* 39.370 44.65
10 in. Hg. (32°F) 0.33421 0.34532 4.9115 0.33864 254* 10* 11.341
100 ft. H20 (60°F) 2.9469 3.0448 43.308 2.9859 2239.6 88.175 100*
1 inch of Hg (mercury) = 13.6 inch H20
1 PSI = 2.31 inches of H20

Conversion Table

Number of... By... To Obtain...
British thermal
units
778.3 Foot-pounds
3.929 x 10-4 Horsepower-hours
2.930 x 10-4 Kilowatt-hours
.2930 Watts-hours
Foot-pounds 1.285 x 10-3 British thermal units
5.05 x 10-7 Horsepower-hours
3.766 x 10-7 Kilowatt-hours
3.766 x 10-4 Watts-hours
Horsepower-hours 2545 British thermal units
1.98 x 104 Foot-pounds
.7457 Kilowatt-hours
745.7 Watts-hours
Kilowatt-hours 3413 British thermal units
2.655 x 106 Foot-pounds
1.341 Horsepower-hours
1000 Watts-hours
Watt-hours 3.413 British thermal units
2655 Foot-pounds
1.341 x 10-3 Horsepower-hours
.001 Kilowatt-hour
1 Btu = 251.996 international calories

Conversion Factors

Length Weight
1 in. = 2.54 cm 1 kg. = 2.205 lb.
1 ft. = .3048 m  
1 yd. = .9144 m Volume
1 m = 39.37 in. 1 cu. in. = 16.39 cm3
  1 cu. ft. = .02832 m3
Area 1 cu. ft. = 62.43 lb. water
1 sq. in. = 6.452 cm2 1 cu. ft. = 7.5 gal water
1 sq. ft. = .0929 m2 1 cu. ft. = 28.32 liters
  1 U.S. gal = .1337 cu. ft.
Horsepower 1 U.S. gal = 231 cu. in.
1 hp. = .746 kW 1 U.S. gal = 8.345 lb. water
1 boiler hp. = 9.8 kW 1 U.S.gal = 3.785 liters

Natural Gas Equivalent

Number of... By... To Obtain...
bar .987 Atmosphere
bar 100,000 Pascal
barrel (42 US gal.) .159 Cu. meters
calorie 4.184 Joule
Joule .00095 BTU
Kilojoule 3,600 Kilowatt-hours
Kilograms/sq. cm. 14.2 Pounds/sq. in.
One therm. = 1,000,000 BTU
One cu. ft. of gas = 1040 BTU (range 1020 - 1055)
One Therm (Rounding off) = 100 cu. ft. gas
One MCF = 1,040,000 BTU
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