## General Construction Data

The metric system

Linear

1 centimetre (cm) 1 decimetre (dm) 1 metre (m) 1 kilometre (km)

Area

100 sq millimetres 100 sq centimetres 100 sq decimetres 1000 sq metres

10 millimetres (mm) 10 centimetres (cm) 10 decimetres (dm) 1000 metres (m)

1 sq centimetre 1 sq decimetre 1 sq metre 1 hectare

Capacity

1 millilitre (ml)

1 centilitre (cl)

1 decilitre (dl)

1 cubic centimetre (cm3) 10 millilitres (ml) 10 centilitres (cl) 10 decilitres (dl)

Weight

1 centigram (cg) 1 decigram (dg) 1 gram (g) 1 decagram (dag) 1 hectogram (hg)

10 milligrams (mg) 10 centigrams (mcg) 10 decigrams (dg) 10 grams (g) 10 decagrams (dag)

Conversion equivalents (imperial/metric)

Length

1 inch 1 foot 1 yard 1 yard 1 mile

Area

Liquid

1 sq inch 1 sq ft 1 sq yard 1 acre 1 acre

1 lb water 1 pint 1 gallon

Horse-power

Weight

Conversion equivalents (metric/imperial)

Length

1 centimetre =

### 1 kilometre =

1. 16 sq mm 0.092903 sq m 0.8361 sq m 4840 sq yards 2.471 hectares
2. 454 litres 0.568 litres 4.546 litres

### 746 watts 0.746 kW 33,000 ft.lb/min

1. 4536 kg 50.8 kg 1016.1 kg
2. 03937 inches 0.3937 inches 1.094 yards 3.282 ft
3. 621373 miles

Area

1 sq millimetre 1 sq metre 1 sq metre 1 acre 1 hectare

0.00155 sq in 10.764 sq ft 1.196 sq yards 4046.86 sq m 0.404686 acres

Weight

Temperature equivalents

In order to convert Fahrenheit to Celsius deduct 32 and multiply by 5/9. To convert Celsius to Fahrenheit multiply by 9/5 and add 32.

Fahrenheit Celsius

 230 110 220 104.4 210 98.9 200 93.3 190 87.8 180 82.2 170 76.7 160 71.1 150 65.6 140 60 130 54.4 120 48.9 110 43.3 100 37.8 90 32.2 80 26.7 70 21.1 60 15.6 50 10 40 4.4 30 -1.1 20 -6.7 10 -12.2 0 -17.8

222 General construction data Areas and volumes Figure

Trapezoidal Trapezium

Parallelogram Regular polygon

Area

Base x half of perpendicular height Sum of areas of contained triangles Sum of areas of contained triangles

Half of sum of parallel sides x perpendicular height

Base x perpendicular height

Half sum of sides x half internal diameter

Circle pi x radius2

Figure

Cylinder

Sphere

Surface area pi x 2 x radius2 x length (curved surface only)

pi x diameter2

Weights of materials kg/m3 kg/m2

Perimeter

Sum of sides Sum of sides Sum of sides Sum of sides

Sum of sides Sum of sides

Sum of sides pi x diameter or pi x 2 x radius

Volume pi x 2 x radius2 x length

Diameter3 x 0.5236

kg/m

Aggregate, coarse

Ashes

Ballast

1,500 B00 600

Weights of materials kg/m3

Blocks, natural aggregate 75mm 100mm 140mm Blocks, lighweight aggregate 75mm 100mm 140mm Bricks, Fletton Bricks, engineering Bricks, concrete Brickwork, 112.5mm Brickwork, 215mm Brickwork, 327.5mm

Cement 1,440

Chalk 2,240

Flint 2,550

Gravel 1,750

Hardcore 1,900

Hoggin 1,750

Lime, ground 750

Stone, natural 2,400

Stone, Portland 2,200

Stone, reconstructed 2,250

Stone, York 2,400

EXCAVATION AND FILLING Shrinkage of deposited material kg/m2 kg/m

160 215 300