Acres to Hectares Converter (Site Area)
1 acre equals 0.4047 hectares (4046.86 m²). Multiply acres by 0.4047 for hectares; multiply hectares by 2.4711 for acres.
Open the acres to hectares calculator →Worked example
A 5.25 acre parcel is 5.25 x 0.4047 = 2.1247 hectares, or 21,246.0 m². For a Canadian Development Permit, a 0.85 acre lot reads as 0.3440 ha (3440.04 m²). Arch Convert's Area tab shows all four units side by side so you can match whichever the planning department expects.
Conversion reference
| Acres | Hectares |
|---|---|
| 0.5 acres | 0.2023 ha (2023.43 m²) |
| 1 acre | 0.4047 ha (4046.86 m²) |
| 2.5 acres | 1.0117 ha (10,117.14 m²) |
| 5 acres | 2.0234 ha (20,234.28 m²) |
| 10 acres | 4.0469 ha (40,468.56 m²) |
Land registries in BC, Ontario, and most of Canada list rural parcels in hectares, while older title documents and US references use acres. Arch Convert's Area tab keeps acres, hectares, square metres, and square feet in lockstep, so a single site area entry populates everything you need for zoning, density, or floor area ratio calculations.
Frequently asked
- How many hectares are in an acre?
- 1 acre equals 0.4047 hectares (more precisely, 4046.8564224 m² / 10,000). Going the other way, 1 hectare equals 2.4711 acres. Arch Convert uses the exact value 4046.8564224 m² per acre so round-tripping does not drift.
- How do I convert site area from acres to hectares for a Canadian DP submission?
- Multiply the parcel area in acres by 0.4047 to get hectares, or run the value through Arch Convert's Area tab to see acres, hectares, square metres, and square feet at once. Most BC and Ontario Development Permit submissions accept either, but consistency across the drawing set matters more than which unit you pick.
- What is the exact size of one acre in square metres?
- One acre is exactly 4046.8564224 m², derived from 43,560 square feet x 0.3048² m/ft. This is the ISO definition. For quick mental math, 1 acre is roughly 4047 m² or 0.4 ha.