Acres to Hectares Converter
Convert international acres and hectares using the exact international acre and metric hectare definitions.
How it works
Acres × 0.40468564224 = hectares. Hectares ÷ 0.40468564224 = acres.
Formula / calculation method
hectares = acres × 0.40468564224acres = hectares ÷ 0.40468564224
Worked examples
- 1 acre equals exactly 0.40468564224 hectare.
- 1 hectare is approximately 2.47105381 acres.
When this tool helps
Useful for farms, land listings, planning, property comparisons, agriculture, forestry, and converting land area between common metric and imperial units.
Related calculations: meters to feet and square meters to square feet.
Browse this topic: Speed, Temperature & Area Converters · Speed, Temperature & Area Guide.
Quick reference
| Input | Result |
|---|---|
| 1 acre | 0.404686 ha |
| 10 acres | 4.046856 ha |
| 1 ha | 2.471054 acres |
Accuracy and definitions
The international acre is exactly 4,046.8564224 square meters and one hectare is exactly 10,000 square meters, giving an exact acre-to-hectare factor.
Reference standards
Where a published measurement definition applies, Solveberry links to primary standards rather than relying only on secondary converter sites.
- NIST Guide to the SI — Appendix B.8 conversion factors
- BIPM SI Brochure — International System of Units
Methodology & verification
- Method
- Acres × 0.40468564224 = hectares. Hectares ÷ 0.40468564224 = acres.
- Verification
- The displayed formula is cross-checked against Solveberry regression cases before release. Calculator inputs and results stay in the browser.
- Last reviewed
- 2026-08-19
Results are calculated locally in your browser. Optional analytics do not include calculator input values or results.
Common questions
How many hectares are in one acre?
Exactly 0.40468564224 hectare for the international acre.
How many acres are in one hectare?
Approximately 2.47105381 international acres.
Can I convert in the opposite direction on this page?
Yes. Use the “Convert from” selector or Swap units button; Solveberry keeps both directions on one canonical page.
Why can my result differ slightly from another converter?
Differences usually come from rounding or from selecting a different regional measurement standard. Solveberry shows the factor or standard used on the page.