Distances        
10 millimeters (mm) 1 centimeter (cm) 0.3937 inches 1 centimeter
1000 mm /100 cm 1 meter (m) 3 feet 1 yard
1000 meters 1 kilometer 91.44 centimeters 1 yard
1.609 kilometers 1 mile 30.48 centimeters 1 foot
6 feet 1 fathom 660 feet 1 furlong
36 inches 1 yard 12 inches 1 foot
1 knot 1 nautical miles/hr 57.29578 degrees 1 radian
1.151 statue miles/hr 1 knot 3438 minutes 1 radian
9.46 x 1012 kilometers 1 light year 1093.6 yards 1 Kilometre
4047 square metres 1 acre 247.1 acres 1 square kilometer
43560 square feet 1 acre 0.3861 square miles 1 square kilometre
4840 square yards 1 acre 0.0929 square meters 1 square foot
144 square inches 1 square foot
Weight     Energy  
10 milligrams (mg) 1 centigram (cg) 26.8 ampere-hours 1 faraday
1000 mg  1 gram (g) 745.7 watts 1 horsepower
1000 g 1 kiliogram 1.341 horsepower 1 kilowatt
3.785 litres 1 gallon
10 milliliters 1 centilitre
1000 ml 1 litre (l)
2.205 pounds 1 kilogram Roman Numerals  
0.03531 cubic feet 1 litre 1 = I 11 = XI 30 = XXX
0.4536 kilograms 1 pound 2 = II 12 = XII 40 = XL
16 ounces 1 pound 3 = III 13 = XIII 50 = L
1000 kilograms 1 metric ton 4 = IV 14 = XIV 100 = C
0.57 litres 1 pint 5 = V 15 = XV 500 = D
6 = VI 16 = XVI 1000 = M
7 = VII 17 = XVII
8 = VIII 18 = XVIII
Thirty days have September, April, June and November, all the rest have 31 except February alone, which has 28 days and 29 in each leap year. (Every 4 years). 9 = IX 19 = XIX
10 = X 20 = XX
     
Equations and formulae
p = 3.142 or 22/7 Area of circle = p r²
r = Radius w = width Circumference of circle = 2p r
h = height l = length Volume of Cylinder = p r²h
b = base Area of triangle = ½ b h
Ø = angle Volume of cube = l w h
Length of Arc = Ø/360 pd
Other shapes Area of Sector = Ø/360 pr²
Physics equations Volume of cone = 1/3 p r²h

 

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