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Acres to Hectares Converter

Convert land area between acres, hectares, and other survey units with metric and imperial context.

Formula shown0 inputs definedUpdated Nov 2025By CalcuTotal TeamFree, no sign-up

Quick Summary

Use this when you need:

Translate property listings from acres to hectares for international buyers
Check that a surveyor's acre measurement matches metric paperwork
Estimate farm size in hectares when deeds list acres

You’ll get:Area

How this is calculated

Formula:

area_target = area_source

In plain language:

Area values are normalized to square meters, then scaled into acres, hectares, or reference units such as square feet and square kilometers.

The formula is always visible so you can verify the math and explain your numbers to anyone who asks.

What these terms mean

Area

Area used in the calculation.

When to use this calculator

Translate property listings from acres to hectares for international buyers
Check that a surveyor's acre measurement matches metric paperwork
Estimate farm size in hectares when deeds list acres
Convert appraisal documents so per-acre pricing matches hectares on environmental reports

Last updated: November 21, 2025

Acres to hectares converter explained

When listings mix acres and hectares, this calculator gives you a clean answer in both systems. Enter any parcel size once and see the matching hectares, acres, square metres, and square kilometres so you can quote the number that fits your paperwork or audience.

How the conversion works

One international acre is exactly $43{,}560\,\text{ft}^2 = 4{,}046.8564224\,\text{m}^2$ ; one hectare is $10{,}000\,\text{m}^2$ . The converter normalizes every entry to square metres, then rescales:

A_{\text{ha}} = A_{\text{ac}} \times 0.40468564224

A_{\text{ac}} = A_{\text{ha}} \times 2.4710538147

US survey acres use $4{,}046.87261\,\text{m}^2$ , which the calculator handles on the same base.

Units and conversions

Unit	Symbol	Relation to m²
Acre (international)	ac	$1\,\text{ac} = 4{,}046.8564224\,\text{m}^2$
Acre (US survey)	ac (US)	$1\,\text{ac}_{US} = 4{,}046.87261\,\text{m}^2$
Hectare	ha	$1\,\text{ha} = 10{,}000\,\text{m}^2$
Square metre	m²	base unit
Square kilometre	km²	$1\,\text{km}^2 = 1{,}000{,}000\,\text{m}^2$

Worked examples

Ranch listing in acres → hectares
Given $12.5\,\text{ac}$ :
$A_{\text{ha}} = 12.5 \times 0.40468564224 \approx 5.0586\,\text{ha}$
Result: 5.06 ha (rounded to 2 decimals).
Land report in hectares → acres
Given $3.2\,\text{ha}$ :
$A_{\text{ac}} = 3.2 \times 2.4710538147 \approx 7.9074\,\text{ac}$
Result: 7.91 ac.

Tips and pitfalls

Decide upfront whether the deed uses international or US survey acres; the difference is small (≈0.004%), but surveyors care.
Keep at least three significant figures when converting backwards to avoid compounding round-off in appraisals.
For mixed-unit drawings, convert lengths to metres first, multiply for area, then convert to acres or hectares; this avoids unit slips.
When comparing yields, convert all plots to hectares; most agronomy benchmarks publish in t/ha.

References and further reading

Acre — Wikipedia
Hectare — Wikipedia *** End Patch

Frequently Asked Questions

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Calculator info

Version:: v1.0.0
Last reviewed:: Nov 21, 2025
Sensitivity:: low
References:: 2

Last updated: November 21, 2025

Acres to hectares converter explained

How the conversion works

One international acre is exactly $43{,}560\,\text{ft}^2 = 4{,}046.8564224\,\text{m}^2$ ; one hectare is $10{,}000\,\text{m}^2$ . The converter normalizes every entry to square metres, then rescales:

A_{\text{ha}} = A_{\text{ac}} \times 0.40468564224

A_{\text{ac}} = A_{\text{ha}} \times 2.4710538147

US survey acres use $4{,}046.87261\,\text{m}^2$ , which the calculator handles on the same base.

Units and conversions

Unit	Symbol	Relation to m²
Acre (international)	ac	$1\,\text{ac} = 4{,}046.8564224\,\text{m}^2$
Acre (US survey)	ac (US)	$1\,\text{ac}_{US} = 4{,}046.87261\,\text{m}^2$
Hectare	ha	$1\,\text{ha} = 10{,}000\,\text{m}^2$
Square metre	m²	base unit
Square kilometre	km²	$1\,\text{km}^2 = 1{,}000{,}000\,\text{m}^2$

Worked examples

Ranch listing in acres → hectares
Given $12.5\,\text{ac}$ :
$A_{\text{ha}} = 12.5 \times 0.40468564224 \approx 5.0586\,\text{ha}$
Result: 5.06 ha (rounded to 2 decimals).
Land report in hectares → acres
Given $3.2\,\text{ha}$ :
$A_{\text{ac}} = 3.2 \times 2.4710538147 \approx 7.9074\,\text{ac}$
Result: 7.91 ac.

Tips and pitfalls

Decide upfront whether the deed uses international or US survey acres; the difference is small (≈0.004%), but surveyors care.
Keep at least three significant figures when converting backwards to avoid compounding round-off in appraisals.
For mixed-unit drawings, convert lengths to metres first, multiply for area, then convert to acres or hectares; this avoids unit slips.
When comparing yields, convert all plots to hectares; most agronomy benchmarks publish in t/ha.

References and further reading

Acre — Wikipedia
Hectare — Wikipedia *** End Patch

Quick Summary

Calculator Tool

How this is calculated

What these terms mean

Area

When to use this calculator

Acres to hectares converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

Related Calculators

Hectares to Acres Converter

Cent to Square Meter Converter

Area Converter

Acreage Calculator

Acres to Square Feet Converter

Gaj to Square Yard Converter

Was this calculator helpful?

Found an error?

Calculator info

Acres to hectares converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

Related Calculators

Hectares to Acres Converter

Cent to Square Meter Converter

Area Converter

Acreage Calculator

Acres to Square Feet Converter

Gaj to Square Yard Converter

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Found an error?

Calculator info