How to convert acres to hectares
Acres and Hectares both measure area, so converting is a single multiplication. One ac equals 0.404686 ha, so you multiply your acres value by 0.404686.
Formula: hectares = acres × 0.404686. For example, 10 ac = 4.046856 ha.
Acres to Hectares conversion table
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 | 0.404686 |
| 2 | 0.809371 |
| 5 | 2.023428 |
| 10 | 4.046856 |
| 25 | 10.117141 |
| 50 | 20.234282 |
| 100 | 40.468564 |
| 1,000 | 404.68564 |
Acres and Hectares explained
Acres (ac): About 4,047 m², a traditional unit for land and farming.
Hectares (ha): Ten thousand square metres, the metric unit for land area.
When you'd convert acres to hectares
You'll convert acres to hectares whenever a measurement is given in one unit but you need it in the other — comparing acres and hectares figures across regions, following a recipe or spec, or double-checking a number. Because 1 ac is exactly 0.404686 ha, the result is precise every time.
Frequently asked questions
How many hectares are in a acre?
One ac equals 0.404686 ha. Multiply your acres figure by 0.404686 to get hectares.
What is the formula to convert acres to hectares?
hectares = acres × 0.404686. The factor 0.404686 is exact.
What is 2 acres in hectares?
2 ac = 0.809371 ha. You can enter any value in the converter above to get an instant result.
Is this Acres to Hectares converter accurate?
Yes. It uses the standard conversion factor (1 ac = 0.404686 ha) defined by BIPM — SI Brochure (derived units), so results are exact to several decimal places.