Acres to Hectares Converter

About Acres → Hectares

US farmland and rural listings use acres; much of the world uses hectares for agricultural statistics and conservation planning.

One hectare equals about 2.471 acres; conversely one acre is about 0.4047 ha.

Acres in, hectares out.

How to use this tool

Enter acres. Calculate to see hectares.

Formula & methodology

This acres to hectares converter applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.

ha = acres x 0.40468564224

Tips for accurate results

• 10 acres ~ 4.05 ha.
• Reverse via area converter hectares to acres.
• Township sections are 640 acres in US PLSS—specialized context.
• Do not confuse acre with plot numbers in urban plans.

Frequently asked questions

Sources & references

The factors and formulas used by this tool follow these references:

• NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
• BIPM — The International System of Units (SI Brochure, 9th edition)

Last reviewed: September 2026. Found an error? Tell us and we will correct it.