How Many Square Feet Is 20 Acres? Dimensions & Comparisons

There are exactly 871,200 square feet in 20 acres. Multiply the number of acres by 43,560:

20 acres × 43,560 square feet per acre = 871,200 square feet.

If you want to picture the dimensions, a rectangular 20-acre area can measure 1,320 feet by 660 feet. A square containing the same area measures approximately 933.38 feet on each side.

The conversion factor comes from NIST's general tables of units. The parcel dimensions on this page are calculated examples, not measurements of a specific property.

Use square feet = acres × 43,560 to convert an area expressed in acres. To reverse the calculation, use acres = square feet ÷ 43,560.

For this example:

• 20 × 43,560 = 871,200 square feet.
• 871,200 ÷ 43,560 = 20 acres.

A nearby-size comparison can help you check the scale of your answer:

Each additional acre adds 43,560 square feet. This conversion does not depend on whether the boundary is square, rectangular, or irregular.

One way to visualize 20 acres is to place two 660-by-660-foot, 10-acre squares side by side. Together they form a rectangle 1,320 feet long and 660 feet wide.

                   1,320 feet total
        +----------------+----------------+
        |                |                |
        |    10 acres    |    10 acres    |
660 ft  |   660 x 660 ft |   660 x 660 ft |
        |                |                |
        +----------------+----------------+
                     20 ACRES

Labeled schematic; not a scale drawing or a property survey.

You can explore the smaller unit in our 10 acres visualized guide. The combined rectangle above is exactly twice that area while keeping the same 660-foot width.

There is no single length and width for 20 acres. Rectangles with different proportions can enclose the same 871,200 square feet.

The square's side length is √871,200 ≈ 933.38 feet. Its displayed dimensions are rounded; use the unrounded square root for exact calculations.

For a rectangle with one known side, calculate:

Other side in feet = 871,200 ÷ known side in feet.

For example, a rectangular parcel 1,000 feet long would need to be 871.2 feet wide. The same area can have a much longer boundary if the shape becomes narrow. Acreage therefore cannot determine a fencing length by itself.

Twenty acres has twice the area of 10 acres. But when both parcels are squares, its sides are only about 1.414 times as long.

Doubling both the length and width of a 660-foot square produces a 1,320-foot square. That multiplies the area by four, giving 40 acres, rather than 20.

To double the area while keeping one dimension unchanged, double only the other dimension. That is how the two-square diagram creates a 20-acre rectangle.

Metric figures use the international acre. See NIST's conversion tables for the base definitions.

For a sports comparison, the NFL lists a complete football field as 360 feet by 160 feet. Including the end zones, that is 57,600 square feet. Dividing 871,200 by 57,600 gives 15.125 full football-field areas.

This compares total area only. It does not establish that 15 complete fields, surrounding space, and access routes will fit within a particular boundary.

How many feet are in 20 acres?

If you mean area, the answer is 871,200 square feet. If you mean a side length, you need the shape: a square is about 933.38 feet per side, while a rectangle could be 1,320 by 660 feet.

How many miles is 20 acres?

Twenty acres is 1/32 of a square mile, an area measurement. It has no fixed length in miles. A one-mile-long rectangle could contain 20 acres if it were 165 feet wide.

How long does it take to walk around 20 acres?

For the square example, the perimeter is about 3,733.52 feet. At an assumed constant walking speed of 3 mph, one lap would take approximately 14 minutes 9 seconds. This is a calculation for an unobstructed square boundary, not a measured travel time. Shape, terrain, and pace change the result.

Is 20 acres a lot of land?

It equals two 10-acre areas or eighty quarter-acre areas. Those comparisons help show its scale; they do not imply that the land can be divided into that many lots.

Does 20 acres mean all the land is usable?

The acreage states the total area, not how much space suits a particular activity. For a specific parcel, the area figure alone cannot tell you its terrain, access, or layout.

• NIST Handbook 44 (2026), Appendix C: unit definitions and conversion factors.
• NFL Play Football: Tackle Football Glossary: full football-field dimensions.

All example dimensions, perimeters, area ratios, and walking times are calculated from the stated values. The square dimensions are rounded; rectangular dimensions shown are exact hypothetical examples. For another visual reference, compare the dimensions and layout of 10 acres.