Conversion charts


UK Ring Sizes & Conversion Charts

There is no substitute for having your finger measured professionally, but it's not an exact science.
Our fingers change in size from morning to evening, month to month and even Winter to Summer.
The following chart is helpful to see how the sizes are compiled.

 
UK: Diameter mm Circumference mm American
A 11.5 36.25 0.5
B 12.3 38.64 1
C 12.7 39.90 1.5
D 13.1 41.15 2
E 13.5 42.41 2.5
F 13.9 43.67 3
G 14.3 44.92 3.25
H 14.7 46.18 3.75
I 15.1 47.44 4.25
J 15.5 48.69 4.75
K 15.9 49.95 5.25
L 16.3 51.24 5.75
M 16.7 52.46 6.25
N 17.1 53.72 6.75
O 17.5 54.98 7
P 17.9 56.23 7.5
Q 18.3 57.49 8
R 18.7 58.75 8.5
S 19.1 60.00 9
T 19.5 61.26 9.5
U 19.9 62.52 10
V 20.3 63.77 10.5
W 20.7 65.00 11
X 21.1 66.29 11.5
Y 21.5 67.51 12
Z 21.9 68.77 12.5
Z+1 22.3 69.99
Z+2 22.7 71.31  
Z+3 23.1 72.57  
Z+4 23.5 73.83  
Z+5 23.9 75.08  
Z+6 24.3 76.34  
Z+7 24.7 77.60  
Z+8 25.1 78.86  

 

 

Capacity Measure Conversions
Metric to American
1 milliliter = 0.338 fluid ounces
1 liter = 1.057 liquid quarts or 0.9081 dry quarts
1 kiloliter = 264.18 gallons or 28.38 bushels

American to Metric (Liquid)
1 fluid ounce = 0.0296 liter
1 gill = 0.1183 liters
1 cup = 0.2366 liters
1 pint = 0.4732 liters
1 quart = 0.9464 liters
1 gallon = 3.7854 liters

American to Metric (Dry)
1 pint = 0.5506 liters
1 quart = 1.1012 liters
1 peck = 8.8098 liters
1 bushel = 35.2390 liters

 
 
 

Converting from Grams
Use this reference when using balances and scales to convert from grams to other units.

To Convert To: Multiply by:
Carats 5.0
Pennyweight 0.6430149
Troy Ounces 0.03215075
Avoirdupois Ounces 0.03527396
Grains 15.43236

 

 

 
 

Inches to Millimeters
To convert inches to millimeters:
Starting with a fraction: divide the numerator by the denominator to get a decimal. Multiply the decimal by 25.4 to get the millimeters.
Example: start with 5/8": 5 ÷ 8 = .625 x 25.4 = 15.875mm

To convert millimeters to inches:
Multiply the millimeter size by .03937 to get the inch equivalent.
Example: start with 16mm: 16 x .03937 = .62992" (5/8")

inches decimals milimeters
1/64 0.01563 0.39688
1/32 0.03125 0.79375
1/16 0.0625 1.5875
1/8 0.125 3.175
1/4 0.250 6.35
1/2 0.50 12.7
1 1.00 25.4

 

 

 
 

Linear Measure Conversions
Metric to English
1 millimeter = 0.03937 inches
1 centimeter = 0.3937 inches
1 meter = 39.37 inches
1 meter = 3.2808 feet
1 kilometer = 0.621 miles

English to Metric
1 mil = 0.0254 millimeters
1 inch = 2.54 centimeters
1 foot = 0.3048 meters
1 yard = 0.9144 meters
1 rod = 5.029 meters
1 mile = 1.6093 kilometers

 

 
 

Measurement Conversion Table

 To convert from to multiply by
 Avoirdupois ounces troy ounces .91146
  grams 28.3495
  dwt 18.2291
 Avoirdupois pounds grams 453.592
  dwt 291.666
  troy ounces 14.583
 Carats grains 3.0865
  dwt .12860
  grams .2
 Cubic centimeters cubic inches .061
  fluid ounces .0338
 Cubic inches cubic centimeters 16.387
  fluid ounces .554
 dwts (pennyweights) carats 7.776
  grams 1.5552
  troy ounces .05
  avoirdupois ounces .05486
 Feet meters .3048
 Fluid ounces cubic centimeters 29.5737
  cubic inches 1.80469
 Grains carats .324
  grams .0648
  dwt .04167
  carats 5.0
  dwt .64301
  troy ounces .03215
 Inches millimeters 25.40
  meters .0254
 Kilograms avoirdupois ounces 2.2046
  troy ounces 32.1507
  dwt 643.014
  pounds 2.20
 Meters feet 3.2808
 Millimeters inches .03937
 Pounds kilograms .4535
 Troy Ounces grams 31.1035
  avoirdupois ounces 14.583
  dwt 20
  avoirdupois pounds .06857

 

 

 
 

Measurement Equivalents
1 meter (m) = 10 decimeters (dm) = 100 centimeters (cm) = 1000 millimeters (mm)

1 meter (m) = 0.1 decameter (dkm) = 0.01 hectometer (hm) = 0.001 kilometer (km)

1 meter (m) = 39.37 in., U.S. Standard = 39.370113 in., British Standard

1 millimeter (mm) = 1000 microns (µ) = 0.03937 in. = 39.37 mils.

 

 
 

RPM Formula
To determine RPM using various positions on a stepped pulley, use this formula: motor pulley diameter ÷ arbor pulley diameter × motor speed = RPM achieved. Below are RPMs for a 1725rpm motor:

 Motor Pulley   Arbor Pulley   Motor Speed   rpm
 2" ÷ 2" × 1725 = 1725
 2" ÷ 3" × 1725 = 1150
 3" ÷ 2" × 1725 = 2588
 3" ÷ 4" × 1725 = 1294
 4" ÷ 3" × 1725 = 2300
 

 
 

Surface Area Conversions
Metric to English
1 sq. centimeter = 0.15499 sq. inches
1 sq. meter = 1.196 sq. yards
1 sq. kilometer = 0.386 sq. miles

English to Metric
1 sq. inch = 6.452 sq. centimeters
1 sq. foot = 929.03 sq. centimeters
1 sq. yard = 0.8361 sq. meters
1 sq. rod = 25.292 sq. meters

 

 
 

Volume (Measure) Conversions
Metric to English
1 cubic centimeter = 0.06102 cubic inches
1 cubic meter = 35.314 cubic feet

English to Metric
1 cubic inch = 16.387 cubic centimeters
1 cubic foot = 0.0283 cubic meters
1 cubic yard = 0.7646 cubic meters
1 cord foot = 0.453 cubic meters
1 cord = 3.625 cubic meters

 

 
 

Weight (Mass) Conversions
Troy to Metric
1 grain = 0.0648 grams
1 pennyweight = 1.5552 grams
1 troy ounce = 31.1035 grams
1 troy pound = 373.24 grams

Carat to Metric
1 grain = 0.648 grams
1 carat = 200 milligrams
1 point = 2 milligrams

Avoirdupois to Troy
1 grain = 1 grain
1 ounce Avoir. = 0.914 troy ounce
1 pound Avoir. = 14.5833 troy ounce

Avoirdupois to Metric
1 grain = 0.0648 grams
1 ounce Avoir. = 28.3495 grams
1 pound Avoir. = 453.59 grams
2.2 pounds Avoir. = 1 kilogram
1 short ton = 907.18 kilograms
1 short ton = .90718 metric tons

Carat to Avoirdupois
1 carat = .007 ounces Avoir.

 

 

HOME

INDEX

email me for orders or help