Square miles to hectares

hectares = square miles × 258.998811

How to convert square miles to hectares

One square mile is 258.998811 hectares, so multiply the number of square miles by 258.998811. For example, 20 square miles is 20 × 258.998811 = 5,179.98 hectares. To go back, divide by the same number, or multiply by 0.00386102.

Quick estimate

Multiplying by about 300 gets within 15.8% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Area conversions come up when buying flooring, paint or turf, comparing house and flat sizes, and measuring land and gardens.

square miles	hectares
1 mi2	258.998811 ha
2 mi2	517.997622 ha
3 mi2	776.996433 ha
4 mi2	1,036 ha
5 mi2	1,294.99 ha
6 mi2	1,553.99 ha
7 mi2	1,812.99 ha
8 mi2	2,071.99 ha
9 mi2	2,330.99 ha
10 mi2	2,589.99 ha
11 mi2	2,848.99 ha
12 mi2	3,107.99 ha
13 mi2	3,366.98 ha
14 mi2	3,625.98 ha
15 mi2	3,884.98 ha
16 mi2	4,143.98 ha
17 mi2	4,402.98 ha
18 mi2	4,661.98 ha
19 mi2	4,920.98 ha
20 mi2	5,179.98 ha
25 mi2	6,474.97 ha
30 mi2	7,769.96 ha
40 mi2	10,359.95 ha
50 mi2	12,949.94 ha
60 mi2	15,539.93 ha
70 mi2	18,129.92 ha
75 mi2	19,424.91 ha
80 mi2	20,719.9 ha
90 mi2	23,309.89 ha
100 mi2	25,899.88 ha
120 mi2	31,079.86 ha
150 mi2	38,849.82 ha
200 mi2	51,799.76 ha
250 mi2	64,749.7 ha
300 mi2	77,699.64 ha
400 mi2	103,599.52 ha
500 mi2	129,499.41 ha
750 mi2	194,249.11 ha
1,000 mi2	258,998.81 ha
1,500 mi2	388,498.22 ha
2,000 mi2	517,997.62 ha
5,000 mi2	1,294,994.06 ha
10,000 mi2	2,589,988.11 ha

Questions

How many hectares are in a square mile?

258.998811 hectares.

How do I convert square miles to hectares in a spreadsheet?

Put the value in A1 and type =A1*258.998811, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.