1 ac = 0.404686 ha (acre → hectare)
1 ac = 0.404686 ha
1 acre equals 0.404686 hectares. To convert acres to hectares, multiply the acre value by 0.404686. For quick reference: 1 ac = 0.404686 ha, 5 ac = 2.02343 ha, 10 ac = 4.04686 ha, 100 ac = 40.4686 ha.
Hectares = Acres × 0.404686Acres to hectares multiplies by 0.40468564224 (exact). A 100-acre farm is 40.5 ha; a 640-acre section is 259 ha. This is the standard conversion in international agriculture — US farm sizes and yields quoted per acre against the hectare-denominated figures the rest of the world (and the FAO) uses. The quick rule 'an acre is about 0.4 hectares' is accurate to 1 %; keep the full factor for land-registry work.
Start with your value in acres.
Multiply the acre value by 0.404686. This is the exact conversion factor from acres to hectares.
The product is your value in hectares. For example, 5 ac × 0.404686 = 2.02343 ha.
The exact factor from acres to hectares is 0.404686.
Hectares = Acres × 0.404686
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.1 ac | 0.040469 ha |
| 0.25 ac | 0.10117 ha |
| 0.5 ac | 0.20234 ha |
| 1 ac | 0.40469 ha |
| 2 ac | 0.80937 ha |
| 3 ac | 1.2141 ha |
| 4 ac | 1.6187 ha |
| 5 ac | 2.0234 ha |
| 6 ac | 2.4281 ha |
| 7 ac | 2.8328 ha |
| 8 ac | 3.2375 ha |
| 9 ac | 3.6422 ha |
| 10 ac | 4.0469 ha |
| 12 ac | 4.8562 ha |
| 15 ac | 6.0703 ha |
| 20 ac | 8.0937 ha |
| 25 ac | 10.117 ha |
| 30 ac | 12.141 ha |
| 40 ac | 16.187 ha |
| 50 ac | 20.234 ha |
| 60 ac | 24.281 ha |
| 70 ac | 28.328 ha |
| 75 ac | 30.351 ha |
| 80 ac | 32.375 ha |
| 90 ac | 36.422 ha |
| 100 ac | 40.469 ha |
| 120 ac | 48.562 ha |
| 150 ac | 60.703 ha |
| 200 ac | 80.937 ha |
| 250 ac | 101.17 ha |
| 300 ac | 121.41 ha |
| 400 ac | 161.87 ha |
| 500 ac | 202.34 ha |
| 600 ac | 242.81 ha |
| 750 ac | 303.51 ha |
| 800 ac | 323.75 ha |
| 1000 ac | 404.69 ha |
| 1200 ac | 485.62 ha |
| 1500 ac | 607.03 ha |
| 2000 ac | 809.37 ha |
| 2500 ac | 1011.7 ha |
| 3000 ac | 1214.1 ha |
| 4000 ac | 1618.7 ha |
| 5000 ac | 2023.4 ha |
| 7500 ac | 3035.1 ha |
| 10000 ac | 4046.9 ha |
| 20000 ac | 8093.7 ha |
| 50000 ac | 20234 ha |
| 100000 ac | 40469 ha |
| 1000000 ac | 404686 ha |
An American football field (with end zones) is about 1.32 acres. A quarter-acre lot is the classic US suburban plot size. In hectares, that gives you: 1 ac = 0.404686 ha, 10 ac = 4.04686 ha, 100 ac = 40.4686 ha.
The acre is the traditional imperial unit for land, still the standard for US and UK property, farmland, and parkland. One acre is exactly 4,046.8564224 m² — historically the area a yoke of oxen could plough in a day, standardised as 1 chain by 1 furlong (66 × 660 feet, or 43,560 square feet). An American football field including end zones is about 1.32 acres.
The hectare is the metric land unit — exactly 10,000 m², a square 100 meters on each side. It's the standard for farmland, forestry, and land registration in nearly every country outside the US. One hectare is about 2.47 acres. A rugby or soccer pitch is roughly 0.7–1 hectare.