Acres → Hectares — imperial to metric made simple
Core idea
Convert acres to hectares using the standard factor 1 acre = 0.4047 ha (precise ≈ 0.40468564).
How it works
Formula: Hectares = Acres × 0.4047.
- Enter acres
- Multiply by 0.4047
- We round the display; calculations maintain precision
Sanity checks
- 1 acre → 0.4047 ha
- 10 acres → 4.047 ha
- 100 acres → 40.469 ha
Shortcuts
- Quick head math: acres ÷ 2.5 ≈ hectares
- Back‑convert: acres ≈ hectares × 2.471
Pitfalls
- Using 0.4 for final numbers—okay for estimates only
- Rounding mid‑calculation—round only for display
Micro‑examples
- 0.25 acre → 0.1012 ha
- 5 acres → 2.0235 ha
- 250 acres → 101.171 ha
Mini‑FAQ
- Exact relations? 1 acre = 43,560 sq ft; 1 ha = 10,000 m²
- Why hectares? International standard for large land areas
- Precision? Use ≥3 decimals for contracts
Action tip
For bilingual documents, include both acres and hectares to avoid confusion.