Useful Measures, Tables, & Formulas

Useful Measures, Tables, & Formulas

5-1-01: In response to a builder request we have added this page. Let us know if you have any suggestions for additional weights or measurements we should add.

  • One cubic foot of volume will support approx. 60 lbs.
  • One cubic foot of fresh water weighs 62.5 lbs.
  • One cubic foot of salt water weighs 64 lbs.
  • One gallon of gasoline weighs 6.2 lbs.
  • One gallon of Diesel fuel weighs 7.1 lbs.
  • One cubic foot of volume contains 7.48 gallons.
  • One board foot - A lumber measurement. One board foot = 1" X 12" X 12". A piece of lumber 2" X 12" X 12" = 2 board feet. When width and thickness are specified, lumber may be called out as linear feet, i.e. 1" X 6" X 24 linear feet. Linear feet is used when the the lumber will be cut into various lengths, as opposed to a piece 1" X 6" x 24' which would be a single piece of wood.

To use this chart:
From X Multiplier = Into
Into X Reciprocal = From

From        IntoMultiplierReciprocal
Inches Millimeters 25.4 0.0394
Length
1/8ths of inches Millimeters 3.175 0.315
1/16ths of inches Millimeters 1.587 0.630
Inches Meters 0.0254 39.37
Feet Meters .3048 3.281
Yards Meters .914 1.094
Miles Kilometers 1.609 0.621
Sea Miles Meters 1852 0.000539
Miles Meters 1609.3 0.000621
Area
Square inches Square centimeters 6.4516 0.155
Square feet Square meters 0.0929 10.764
Volume
Cubic inches Cubic centermeters 16.387 0.061
Cubic inches Liters 0.016 62.5
Cubic feet Cubic meters 0.028 35.315
Cubic yards Cubic meters 0.765 1.308
Imperial gallons Liters 4.546 0.220
USA gallons Liters 3.785 0.264
Imperial gallons USA gallons 1.205 0.830
Weight
Grams Ounces 0.035 28.35
Pounds (lbs.) Kilograms 0.454 2.205
Hundredweights (cwt) Kilograms 50.802 0.020
Tons French tonnes 1.016 0.984
Density
Pounds per cubic foot Kilograms per cubic meter 16.019 0.0624
Speed
Kilometers per hour Meters per second 0.278 3.6
Meters per second Knots 1.943 --
Feet per second Meters per second 0.305 3.281
Feet per second Miles per hour 0.682 1.467
Feet per minute Kilometers per hour 0.018 54.68
Miles per hour Meters per second 0.447 2.237
Miles per hour Kilometers per hour 1.609 0.621
Knots Miles per hour 1.151 --
Horsepower (hp) kilowatts (kW) 0.746 1.341

 

Basic Mathematical Formulas 

Distance
1 foot = 12 inches
1 yard = 3 feet
1 mile = 5,280 feet
1 mile ≈ 1.61 kilometers
1 inch = 2.54 centimeters
1 foot = 0.3048 meters
1 meter = 1,000 millimeters
1 meter = 100 centimeters
1 kilometer = 1,000 meters
1 kilometer ≈ 0.62 miles

Area
1 square foot = 144 square inches
1 square yard = 9 square feet
1 acre = 43,560 square feet

Volume
1 cup = 8 fluid ounces
1 quart = 4 cups
1 gallon = 4 quarts
1 gallon = 231 cubic inches
1 liter ≈ 0.264 gallons
1 cubic foot = 1,728 cubic inches
1 cubic yard = 27 cubic feet
1 board foot = 1 inch by 12 inches by 12 inches

Weight
1 ounce ≈ 28.350 grams
1 pound = 16 ounces
1 pound ≈ 453.592 grams
1 milligram = 0.001 grams
1 kilogram = 1,000 grams
1 kilogram ≈ 2.2 pounds
1 ton = 2,000 pounds

Rectangle
perimeter = 2(length + width)
area = length x width

Rectangular Solid (Box)
volume = length x width x height

Cube
volume = (length of side)3

Triangle
sum of angles = 180°
area = ½ (base x height)

Circle
number of degrees in a circle = 360°
circumference ≈ 3.14 x diameter
area ≈ 3.14 x (radius)2

Cylinder
volume ≈ 3.14 x (radius)2 x height

Cone
volume ≈ 

Sphere (Ball)
volume ≈ 4/3 x 3.14 x (radius)3

Electricity
1 kilowatt-hour = 1,000 watt-hours
amps = watts ÷ volts

Temperature
°C =  0.56(°F – 32) or  5/9(°F – 32)
°F = 1.8(°C) + 32 or ( 9/5  x °C) + 32

Table: Inches to Millimeters

InchesMillimeters
1/8 3.2
1/4 6.4
3/8 9.5
1/2 12.7
5/8 15.9
3/4 19.1
7/8 22.2
1 25.4
2 50.8
3 76.2
4 101.6
5 127.0
6 152.4
7 177.8
8 203.2
9 228.6
10 254.0
11 279.4
12 304.8

 Table: Feet to Meters

FeetMeters &
Millimeters
1 .305
2 .610
3 .914
4 1.219
5 1.524
6 1.829
7 2.134
8 2.438
9 2.743
10 3.048

 Table: Pounds to kilograms

To use this chart:
The numbers down the left side are even number of pounds. To find the kilogram equivalent of 22 pounds, go to the "20" row and look in the "2" column.

Pounds0123456789
0-- 0.45 0.91 1.36 1.81 2.27 2.72 3.18 3.63 4.08
20 9.07 9.53 9.98 10.43 10.89 11.34 11.79 12.25 12.70 13.15
40 18.14 18.60 19.05 19.50 19.96 20.41 20.87 21.32 21.77 22.23
60 27.22 27.67 28.12 28.58 29.03 29.48 29.94 30.39 30.84 31.30
80 36.29 36.74 37.19 37.65 38.10 38.56 39.01 39.46 39.92 40.37
100 45.36 45.81 46.27 46.72 47.17 47.63 48.08 48.53 48.99 49.44
120 54.43 54.88 55.34 55.79 56.25 56.70 57.15 57.61 58.06 58.51
140 63.50 63.96 64.41 64.86 65.32 65.77 66.22 66.68 67.13 67.59
160 72.57 73.03 73.48 73.94 74.39 74.84 75.30 75.75 76.20 76.66
180 81.65 82.10 82.55 83.01 83.46 83.91 84.37 84.82 85.28 85.73
200 90.72 91.17 91.63 92.08 92.53 92.99 93.44 93.89 94.35 94.80
220 99.79 100.24 100.70 101.15 101.61 102.06 102.51 102.97 103.42 103.87
240 108.86 109.32 109.77 110.22 110.68 111.13 111.58 112.04 112.49 112.95
260 117.93 118.39 118.84 119.30 119.75 120.20 120.66 121.11 121.56 122.02
280 127.01 127.46 127.91 128.37 128.82 129.27 129.73 130.18 130.64 131.09
300 136.08 136.53 136.99 137.44 137.89 138.35 138.80 139.25 139.71 140.16
320 145.15 145.60 146.06 146.51 146.96 147.42 147.87 148.33 148.78 149.23
340 154.22 154.48 155.13 155.58 156.04 156.49 156.94 157.40 157.85 158.30
360 163.29 163.75 164.20 164.65 165.11 165.56 166.02 166.47 166.92 167.38
380 172.37 172.82 173.27 173.73 174.18 174.63 175.09 175.54 175.99 176.45
400 181.44 181.89 183.34 182.80 183.25 183.71 184.16 184.61 185.07 185.52
420 190.51 190.96 191.42 191.87 192.32 192.78 193.23 193.68 194.14 194.59
440 199.58 200.03 200.49 200.94 201.40 201.85 202.30 202.76 203.21 203.66
460 208.65 209.11 209.56 210.01 210.47 210.92 211.37 211.83 212.28 212.74
480 217.72 218.18 218.63 219.09 219.54 219.99 220.45 220.90 221.35 221.81
500 226.80 -- -- -- -- -- -- -- -- --

 

 Table: Square feet to square meters


Square feetSquare meters
10 0.93
20 1.86
30 2.79
40 3.72
50 4.65
60 5.57
70 6.50
80 7.43
90 8.36
100 9.29
110 10.22
120 11.15
140 13.01
160 14.86
180 16.72
200 18.58
220 20.44
240 22.30
260 24.15
280 26.01
300 27.87
320 29.73
340 31.59
360 33.45
380 35.30
400 37.16
420 39.02
440 40.88
460 42.74
480 44.59
500 46.45

 Table: Speed Conversions, Knots, MPH, KPH

SPEED CONVERSIONS - KNOTS, MPH, KPH
KnotsMiles per HourKilometers per Hour
1 1.152 1.85
2 2.303 3.70
3 3.445 5.55
4 4.606 7.41
5 5.758 9.26
6 6.909 11.13
7 8.061 12.98
8 9.212 14.83
9 10.364 16.68
10 11.515 18.55

 Table: Millimeter equivalents of screw and nail gauges specified in Glen-L plans [inches (decimal) X 25.4 = mm]

Gauge No.Screw DiameterNail Diameter
  inches mm inches mm
8 .163 4.1 - -
10 .189 4.8 .134 3.4
12 .216 5.5 .109 2.8
14 .242 6.2 .083 2.1
18 .294 7.5 - -

 Table: Pipe ID and OD

Nominal ID
Sched. 40		OD inches
1/4" .540
3/8" .675
1/2" .840
3/4" 1.050
1" 1.315
1 1/4" 1.660

 Table: Metal gauges

Gauge No.Thickness
  mm inches
6 4.87 0.192
7 4.46 0.176
8 4.06 0.160
9 3.66 0.144
10 3.25 0.128
11 2.94 0.116
12 2.64 0.104
13 2.34 0.092
14 2.00 0.080
15 1.83 0.072
16 1.62 0.064
17 1.42 0.056
18 1.22 0.048

 Table: Fahrenheit/Centigrade

Conversion formulas:
oC = oF - 32 divided by 1.8, oF = oC X 1.8 + 32
oCoF
0 32
1 33.8
2 35.6
3 37.4
4 39.2
5 41.0
6 42.8
7 44.6
8 46.4
9 48.2
10 50.0
11 51.8
12 53.6
13 55.4
14 57.2
15 59.0
16 60.8
17 62.6
18 64.4
19 66.2
20 68.0
21 69.8
22 71.6
23 73.4
24 75.2
25 77.0
26 78.8
27 80.6
28 82.4
29 84.2
30 86.0
31 87.8
32 89.6
33 91.4