
Area
Name Symbol m
2
cm
2
sq in sq ft sq yd
1 square metre m
2
1 104 1550 10.7639 1.19599
1 square centimetre cm
2
10
4
1 0.3937008 0.0328084 0.01093613
1 square inch sq in 6.4516 10
4
6.4516 1 1/144 1/1296
1 square foot sq ft 0.092903 929.0304 144 1 1/9
1 square yard sq yd 0.836127 8361.27 1296 9 1
Volume
Name Symbol m
3
lmlcm
3
cu yd cu ft cu in
1 cubic metre m
3
1 1000 10
6
1.30795 35.31464 5085.308
1 litre l 0.001 1 1000 1.308 10
3
0.035315 5.085308
1 millilitre
ml 0.000001 0.001 1 1.308 10
6
35.32 10
6
0.005085
1 cubic yard cu yd 0.76455551 764.5555 764555.5 1 27 3888
1 cubic foot cu ft 0.02831687 28.31687 28316.87 0.037037 1 144
1 cubic inch cu in 196.6 10
6
0.196645 196.6449 257.2 10
6
6.944 10
3
1
Note:
the millilitre is equal to the cubic centimetre.
Mass
Name Symbol kg g lb oz gr
1 kilogram kg 1 1000 2.204623 35.27396 15,432
1gram g 0.001 1 2.205 10
3
0.03527396 15.43
1 pound lb 0.45359229 453.5923 1 16 700
1 ounce oz 0.02834952 28.34953 0.0625 1 437
1 grain gr 64.79 10
6
0.064799 142.9 10
6
2.2857 10
3
1
Time
Name Symbol s min h d yr
1 second s 1 1/60 1/3600 1/86400 31,688 10
9
1 minute min 60 1 1/60 1/1440 1.90133 10
6
1 hour h 3600 60 1 1/24 114.08 10
6
1 day d 86,400 1440 24 1 2.73791 10
3
1 year yr 31,556,926 526103 8765 365.25 1
172 Ventilation and Airflow in Buildings
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