Area | The Units and Constants Handbook at KnowledgeDoor

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	Area
	Area

Characteristic		acre		Notes
Characteristic		acre		Notes
Symbol	ac
Other Name	international-acre
Metric (SI) Equivalent	4.0468564224 deci hectares			This equivalent and the one below are calculated from exact values.
Another Metric (SI) Equivalent with More Basic Units	40.468564224 deka meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	4840 yards2
Unit Group	acre Group

Characteristic		acre-US-survey ( Used in the United States for some survey measurements )		Notes
Characteristic				Notes
Other Names	ac-US-survey, survey-acre
Metric (SI) Equivalent	4.0468726099 deci hectares			This equivalent and the one below are calculated from exact values.
Another Metric (SI) Equivalent with More Basic Units	40.468726099 deka meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	4840 yards-US-survey2
Unit Group	acre Group

Characteristic		are		Notes
Characteristic		are		Notes
Symbol	a
Metric (SI) Equivalent	1 deka meter2			This equivalent is exact.
Metric (SI) Dimensions	length2

Characteristic		arpent-area ( Quebec survey unit )		Notes
Characteristic		arpent-area ( Quebec survey unit )		Notes
Metric (SI) Equivalent	3.4188938592 deci hectares			This equivalent and the one below are calculated from exact values.
Another Metric (SI) Equivalent with More Basic Units	34.188938592 deka meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	arpent-length2

Characteristic		barn		Notes
Characteristic		barn		Notes
Symbol	b
Metric (SI) Equivalent	100 femto meters2			This equivalent is exact.
Metric (SI) Dimensions	length2

Characteristic		centare		Notes
Characteristic		centare		Notes
Symbol	ca
Other Name	centiare
Metric (SI) Equivalent	100 deci meters2			This equivalent is exact.
Metric (SI) Dimensions	length2

Characteristic		circular-inch		Notes
Characteristic		circular-inch		Notes
Symbol	cin
Other Name	cir-in
Metric (SI) Equivalent	5.067074791 centi meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	pi * (inch / 2)2

Characteristic		circular-mil		Notes
Characteristic		circular-mil		Notes
Symbol	cmil
Other Name	cir-mil
Metric (SI) Equivalent	506.7074791 micro meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	pi * (mil-length / 2)2

Characteristic		hectare		Notes
Characteristic		hectare		Notes
Symbol	ha
Other Name	hectoare
Metric (SI) Equivalent	hectare is a metric unit
Another Metric (SI) Equivalent with More Basic Units	10000 meters2			This equivalent is exact.
Metric (SI) Dimensions	length2

Characteristic		rood		Notes
Characteristic		rood		Notes
Metric (SI) Equivalent	1.0117141056 deci hectares			This equivalent and the one below are calculated from exact values.
Another Metric (SI) Equivalent with More Basic Units	10.117141056 deka meters2
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	40 rods2

Characteristic		section		Notes
Characteristic		section		Notes
Metric (SI) Equivalent	2.5899984703 kilo meters2			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	mile-US-survey2

Characteristic		shed		Notes
Characteristic		shed		Notes
Metric (SI) Equivalent	100 ronto meters2			This equivalent is exact.
Metric (SI) Dimensions	length2

Characteristic		Thomson-cross-section		Notes
Characteristic		Thomson-cross-section		Notes
Symbol	σe			Use "sigma-e" for our conversion calculators.
Metric (SI) Equivalent	6.6524587321×10-29 meters2
Standard Uncertainty	± 6×10-38 meters2
Metric (SI) Dimensions	length2

Characteristic		township ( Used in the United States )		Notes
Characteristic		township ( Used in the United States )		Notes
Metric (SI) Equivalent	93.239944932 kilo meters2			This equivalent is calculated from exact values.
Metric (SI) Dimensions	length2
Description in Terms of Other Units and Constants	(6 miles-US-survey)2

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