Square Miles to Acres Converter

Convert square miles to acres instantly. Perfect for understanding large geographical areas and extensive land holdings.

square miles = acres

Result

1 square mile = 640 acres

Formula: Acres = Square Miles × 640

Area Converter Acres to Square Feet Square Feet to Acres Hectare to Acres Acres to Hectare Sq Ft to Sq Meter Sq Meter to Sq Ft Acres to Square Miles Sq Ft to Sq Yards Sq Yards to Sq Ft

Square Miles → Acres — big land made readable

Core idea

Convert square miles to acres with the exact factor 1 sq mi = 640 acres.

How it works

Formula: Acres = Square miles × 640.

Enter square miles
Multiply by 640
UI rounds; internal math keeps full precision

Sanity checks

0.25 sq mi → 160 acres
0.5 sq mi → 320 acres
1 sq mi → 640 acres

Shortcuts

Back‑convert: Sq mi = Acres ÷ 640
Metric note: 1 sq mi ≈ 2.59 km² ≈ 259 ha

Pitfalls

Using rounded 600 for final results
Mixing km²/ha without clear conversion

Micro‑examples

2 sq mi → 1,280 acres
5 sq mi → 3,200 acres
10 sq mi → 6,400 acres

Mini‑FAQ

Exact constant? 640 acres per sq mi
Precision? Whole numbers usually suffice at this scale
Cross‑units? 640 acres ≈ 259 hectares

Action tip

For public docs, show both sq mi and acres to improve readability and context.