Unit of Measure Conversions

Area Conversions

INPUT value:

OUTPUT values

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Additional Units and Information

Name	Symbol	Value	Description/Notes
are	a	100 square metres; 1/100 hectare
centare		1 square metre
square chain	ch²	484 square yards; 1/10 acre
circular mil		7.853982 x 10^-7 square inch	The area of a circle with 0.001" diameter. Used in measuring the cross-section of fine wire
hectad		10 kilometre x 10 kilometre square	Used in British Ordnance Survey mapping
square millimetre	mm²	1/100 square centimetre
myriad		100 kilometre x 100 kilometre square	Used in British Ordnance Survey mapping
square pole	pl²	30¼ square yards
rood		40 square poles; ¼ acre
tetrad		2 kilometre x 2 kilometre square	Used in British Ordnance Survey mapping

Useful Approximations

Approximation	% Accuracy
1 square yard ≈ 1300 square inches	99.7
1 square metre ≈ 1500 square inches	96.8
1 hectare ≈ 2½ acres	98.8
1 square kilometre ≈ 250 acres	98.8
1 square mile ≈ 2½ square kilometres	96.5
1 square mile ≈ ¾ square international nautical mile	99.3