square mile to acre
Live square mile (mi²) to acre (ac) converter. Plus a 10-value reference table and FAQs.
Conversion table
Ten sample values from square mile to acre. Use the converter above for arbitrary values.
| square mile (mi²) | → | acre (ac) |
|---|---|---|
| 0.001 mi² | → | 0.64 ac |
| 0.01 mi² | → | 6.4 ac |
| 0.1 mi² | → | 64 ac |
| 0.5 mi² | → | 320 ac |
| 1 mi² | → | 640 ac |
| 2 mi² | → | 1,280 ac |
| 5 mi² | → | 3,200 ac |
| 10 mi² | → | 6,400 ac |
| 100 mi² | → | 64,000 ac |
| 1,000 mi² | → | 640,000 ac |
About the square mile
640 acres. US county/area units.
About the acre
4,047 m². US farmland and lot size.
How square mile to acre conversion works
Both units belong to Area. Unitbox first expresses the input in the category reference unit (m²), then expresses that same quantity in acre.
The right unit depends on the convention used by your industry, country, instrument, or source document.
Unit definitions and conversion factors are maintained in the Unitbox methodology. Last reviewed with the current conversion dataset.
Frequently asked questions
Frequently Asked Questions
How do I convert square mile to acre?
Multiply the square mile value by 640 to get it in acre. For example, 10 mi² = 6,400 ac.
What is 1 mi² in ac?
1 mi² = 640 ac.
What is 100 mi² in ac?
100 mi² = 64,000 ac.
What is the formula?
Linear: multiply by 640 (the unit factor ratio).
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