Metric Conversions
Fractional Value |
Decimal Equivalent |
Millimeters | Fractional Value |
Decimal Equivalent |
Millimeters |
---|---|---|---|---|---|
1/64″ | .015625 | 0.3968 | 33/64″ | .515625 | 13.0966 |
1/32″ | .03125 | 0.7937 | 17/32″ | .53125 | 13.4934 |
3/64″ | .046875 | 1.1906 | 35/64″ | .546875 | 13.8903 |
1/16″ | .0625 | 1.5875 | 9/16″ | .5625 | 14.2872 |
5/64″ | .078125 | 1.9843 | 37/64″ | .578125 | 14.6841 |
3/32″ | .09375 | 2.3812 | 19/32″ | .59375 | 15.0809 |
7/64″ | .109375 | 2.7780 | 39/64″ | .609375 | 15.4778 |
1/8″ | .1250 | 3.1749 | 5/8″ | .6250 | 15.8747 |
9/64″ | .140625 | 3.5718 | 41/64″ | .640625 | 16.2715 |
5/32″ | .15626 | 3.9686 | 21/32″ | .65625 | 16.6684 |
11/64″ | .171875 | 4.3655 | 43/64″ | .671875 | 17.0653 |
3/16″ | .1875 | 4.7624 | 11/16″ | .6875 | 17.4621 |
13/64″ | .203125 | 5.1592 | 45/64″ | .703125 | 17.8590 | 7/32″ | .21875 | 5.5561 | 23/32″ | .71875 | 18.2559 |
15/64″ | .234375 | 5.9530 | 47/64″ | .734375 | 18.6527 |
1/4″ | .2500 | 6.3498 | 3/4″ | .7500 | 19.0496 |
17/64″ | .265625 | 6.7467 | 49/64″ | .765625 | 19.4465 |
9/32″ | .28125 | 7.1436 | 25/32″ | .78125 | 19.8433 |
19/64″ | .296875 | 7.5404 | 51/64″ | .796875 | 20.2402 |
5/16″ | .3125 | 7.9373 | 13/16″ | .8125 | 20.6371 |
21/64″ | .328125 | 8.3342 | 53/64″ | .828125 | 21.0339 |
11/32″ | .34375 | 8.7310 | 27/32″ | .84375 | 21.4308 |
23/64″ | .359375 | 9.1279 | 55/64″ | .859375 | 21.8277 |
3/8″ | .3750 | 9.5248 | 7/8″ | .8750 | 22.2245 |
25/64″ | .390625 | 9.9216 | 57/64″ | .890625 | 22.6214 |
13/32″ | .40625 | 10.3185 | 29/32″ | .90625 | 23.0183 |
27/64″ | .421875 | 10.7154 | 59/64″ | .921875 | 23.4151 |
7/16″ | .4375 | 11.1122 | 15/16″ | .9375 | 23.8120 |
29/64″ | .453125 | 11.5091 | 61/64″ | .953125 | 24.2089 |
15/32″ | .46875 | 11.9060 | 31/32″ | .96875 | 24.6057 |
31/64″ | .484375 | 12.3029 | 63/64″ | .984375 | 25.0026 |
1/2″ | .5000 | 12.6997 | 1″ | 1.0000 | 25.3995 |
- 32 points of a compass = 360 degrees
- 1 point of a compass = 11.25 degrees
- To convert degrees C. to degrees F., multiply by 9, divide by 5 and add 32
- To convert degrees F. to degrees C., deduct 32, multiply by 5 and divide by 9
- 1 inch = 2.54 centimeter
- 1 foot (U.S.) = .3048 meters = 1 British foot
- 1 kilometer = 3,280.8399 feet = .5399568 nm
- Statute mile = 5,280 ft = 1.609 km = .869 nm
- Nautical mile = 1.15 stat miles = 1,852 m = 6,076.12 ft = about 2,000 yds (1 minute of latitude)
- Length of 1 minute of latitude at equator = approximately 6,046 ft
- Length of 1 minute of latitude at poles = approximately 6,108 ft
- Knot = 1 nm/hr = 1.15 mph = 1.852 km/hr
- Fathom = 6 ft = 1.829
- Cable = 720 feet = 120 fathom
- Cable (British) = .1 n
- 7.5 cables = 1 statute mil
- 8.44 cables = 1 nm
- Charts – nautical miles per inch = reciprocal of natural scale/72,913.39
- Charts – statute miles per inch = reciprocal of natural scale/63,360
- Charts – inches per nm = 72,913.39 x natural scale
- Charts – inches per sm = 63,360 x natural scale
- Charts – natural scale = 1:72,913.39 x nm/inch
- Charts – natural scale = 1:63,360 x sm/inch
- Std. atmospheric pressure at sea level = 29.92126 inches of mercury
- millibar = .02952998 inches of mercury
- millimeter of mercury = 1.3332237 millibars
- register ton = 100 cubic feet
- measurement ton = 40 cubic feet = 1 freight ton
- 1 barrel (42 gals) of diesel fuel = 315 pounds
- 1 gallon of engine motor oil = 7.3 pounds
- 1 cubic foot = 7.481 gals of water
- cubic foot of seawater = 64 lbs
- cubic foot of freshwater = 62.428 lbs @39.2 degrees F. (temp. of max. density)
- 1 cubic foot of normal storage ice = 62 lbs
- Speed of sound is approximately 1,117 feet per second
- Approximate distance (nm) of a flash of light to resulting sound = elapsed time divided by 5.5
- 1 displacement ton = 35 cubic feet of seawater = 1 long ton
- 1 ton of freshwater=35.84 cubic feet
(Note: some values above are based upon relationships enumerated in Bowditch’s American Practical Navigator, Vol. I, 1984)
Temperature Conversions
- Fahrenheit = 9 x Celsius ÷ 5 + 32
- Celsius = Fahrenheit – 32 x 5 ÷ 9
Measurement Conversions and Equivalents
If you know the length in the English system… | multiply by… | to convert to … | If you know the length in the Metric system… | multiply by… | to convert to … |
---|---|---|---|---|---|
inches | 25.0 | millimeters | millemeters | 0.04 | inches |
inches | 2.5 | centimeters | centimeters | 0.4 | inches |
feet | 30.0 | centimeters | centimeters | 0.033 | feet |
feet | 0.3 | meters | meters | 3.3 | feet |
yards | 90.0 | centimeters | centimeters | 0.01 | yards |
yards | 0.9 | meters | meters | 1.1 | yards |
miles | 1.6 | kilometer | kilometers | 0.62 | miles |
Weight Conversions and Equivalents
If you know the weight in the English system… | multiply by… | to convert to … | If you know the weight in the Metric system… | multiply by… | to convert to … |
---|---|---|---|---|---|
ounces | 28.0 | grams | grams | 0.035 | ounces |
ounces | 0.028 | kilograms | kilograms | 35.0 | ounces |
pounds | 454.0 | grams | grams | 0.002 | pounds |
pounds | 0.45 | kilograms | kilograms | 2.2 | pounds |
Metric Length Equivalents
Metric | English | ||
---|---|---|---|
millimeter (mm) | 10mm = 1cm = 0.3937 in | inch (in) | 12 in = 1 ft = 0.3048 m |
centimeter (cm) | 10cm = 1dm = 3.937 in | foot (ft) | 3 ft = 1 yd = 0.9144 m |
decimeter (dm) | 10dm = 1 m = 3.2808 ft | yard (yd) | 5 1/2 yd = 16 1/2 ft = 5.029 m |
meter (m) | 10m = 1 dam = 32.808 ft | mile (mi) | 1 mi = 5,280 ft |
dekameter (dam) | 10dam = 1hm = 328.08 ft | ||
hectometer (hm) | 10hm = 1km = 0.621 mi |
Metric Weight Equivalents
Metric | English | ||
---|---|---|---|
milligram (mg) | 10 mg = 1 cg = 0.1543 gr | grain | 1 gr = 0.0648 g |
centigram (cg) | 10 cg = 1 dg = 1.5432 gr | ounce | 1 oz = 28.3495 g |
decigram (dg) | 10 dg = 1 gm = 15.432 gr | pound | 1 lb = 16 oz = 0.4536 kg |
gram (g) | 10 g = 1 dg = 0.35274 oz | ||
dekagram (dag) | 10 dg = 1 hg = 3.5274 oz | ||
hectogram (hg) | 10 hg = 1 kg = 2.2046 lb | ||
kilogram (kg) | 1,000 kg = 2,204.6 lb |