How many hectares is 1 acre?

1 acre equals exactly 0.40468564224 hectares. This is derived from the international acre definition of 4,046.8564224 m², divided by 10,000 m² per hectare.

How many acres is 1 hectare?

1 hectare equals approximately 2.47105 acres. Divide any hectare value by 0.404686 (or multiply by 2.47105) to get acres.

Is the conversion exact?

Yes. The international acre is defined as exactly 4,046.8564224 m², so the conversion factor 0.40468564224 is exact to 11 decimal places. This tool rounds output to 6 significant figures, which exceeds practical needs.

An acre is a unit of land area used mainly in the United States and United Kingdom. One acre equals 43,560 square feet — roughly the size of an American football field excluding end zones.

A hectare is the standard metric unit for land area, equal to 10,000 m² (a 100 m × 100 m square). It is used globally in agriculture, land management, and real estate outside the US.

Can I convert large numbers like 10,000 acres?

Yes. Simply type the number (without commas) into the input. The result will be shown with appropriate decimal places and formatted with commas for readability.

Acres to Hectares Converter

Name: Acres to Hectares Converter
Availability: InStock
Author: Nham Vu

Enter any number of acres and instantly get the equivalent in hectares, with the step-by-step formula.

Enter Acres

Acres (ac)

Result in Hectares (ha)

—

Land Size Reference

Acres	Hectares	Reference
0.025	0.0101	Average US house lot
1	0.4047	About a city block
2.47	1.0000	1 hectare (100m × 100m)
10	4.047	Small farm field
100	40.47	Medium farm (~0.4 km²)
640	259.0	1 square mile (section)
1,000	404.7	Large ranch or estate

Conversion factor: 1 acre = 0.404686 ha | 1 ha = 2.47105 acres

Copied!

Summary

Enter any number of acres and instantly get the equivalent in hectares, with the step-by-step formula.

How it works

Enter the number of acres in the input field.
The converter multiplies your value by 0.40468564224 to get hectares.
The result and formula update instantly as you type.
Click Copy to copy the hectare value to your clipboard.
Use the quick reference table to compare against common land benchmarks.

Use cases

Convert US or UK farmland acreage for international property listings.
Translate land survey measurements into metric units for foreign buyers.
Calculate agricultural plot sizes for metric-system planning.
Compare deed acreage against metric land records.
Convert national park or reserve areas for research reports.
Check real-estate listings that mix acre and hectare measurements.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu