Instant Unit Conversion
Convert Acres to Hectares (ac to ha)
Exact formula, conversion factors, live calculator, and reference charts for acres to hectares.
Method reviewed:Exact defined factors — international yard and pound (1959), US customary gallon and cup, SI — the values NIST SP 811 lists · reviewed September 2026
Direct AnswerFormula: ha = ac × 0.40468564224
1 acre is equal to exactly 0.40468564224 hectares. To convert acres to hectares, multiply by 0.40468564224.
Live Acres to Hectares Calculator
Formula:
ha = ac × 0.40468564224Open full area converter →Acres to Hectares Conversion Table
Quick reference conversion chart from 1 to 100 acres.
| Acres (ac) | Hectares (ha) | Mathematical Formula |
|---|---|---|
| 1 ac | 0.4047 ha | 1 × 0.404686 |
| 2 ac | 0.8094 ha | 2 × 0.404686 |
| 5 ac | 2.0234 ha | 5 × 0.404686 |
| 10 ac | 4.0469 ha | 10 × 0.404686 |
| 15 ac | 6.0703 ha | 15 × 0.404686 |
| 20 ac | 8.0937 ha | 20 × 0.404686 |
| 25 ac | 10.1171 ha | 25 × 0.404686 |
| 50 ac | 20.2343 ha | 50 × 0.404686 |
| 75 ac | 30.3514 ha | 75 × 0.404686 |
| 100 ac | 40.4686 ha | 100 × 0.404686 |
Frequently Asked Questions
How many acres in a hectare?
2.471 acres. A hectare is a square 100 m on each side, or 10,000 square metres.
Where does the acre come from?
From the area a yoke of oxen could plough in a day — historically a long, narrow strip, which is why an acre is 66 ft by 660 ft rather than a square.
What is 5 acres in hectares?
5 acres is 2.02 hectares, near enough two.