Acres from Feet: How to Calculate Land Area

This calculator converts a rectangular plot’s length and width from feet into acres. You enter the two dimensions in feet, and the calculator returns the area in acres, along with the area in square feet and square meters for reference. This is useful for real estate, farming, landscaping, and any project where you need to know the acreage of a rectangular parcel.

Formula

The area in acres is calculated from the length and width in feet using the formula:

Acres = (Length × Width) / 43,560

Where:

• Length = the length of the rectangular plot in feet (ft)
• Width = the width of the rectangular plot in feet (ft)
• 43,560 = the number of square feet in one acre (a constant)

The result is the area in acres. If you need the area in square feet, simply multiply length × width. To convert square feet to square meters, multiply by 0.092903.

Worked Example

Using the default values from the calculator: length = 200 ft, width = 150 ft.

1. Calculate the area in square feet: 200 × 150 = 30,000 sq ft.
2. Divide by 43,560 to get acres: 30,000 ÷ 43,560 ≈ 0.6887 acres.
3. Rounded to three decimal places: 0.689 acres.

The calculator shows the same result: 0.689 acres. The area in square feet is 30,000, and in square meters it is 30,000 × 0.092903 ≈ 2,787.09 sq m.

When to Use This Calculator

Use this calculator whenever you have the length and width of a rectangular area in feet and need to know the acreage. Common scenarios include:

• Determining the size of a residential lot or farm field.
• Planning land use for gardening, construction, or fencing.
• Comparing property sizes listed in different units.
• Estimating how much seed, fertilizer, or grass to buy.

Remember that this calculator assumes a perfect rectangle. If your land is irregularly shaped, you’ll need to use a different method, such as breaking it into rectangles or using a surveyor.

Common Mistakes

• Using the wrong conversion factor: One acre is exactly 43,560 square feet. Some people mistakenly use 43,560 or 4,840 (square yards in an acre). Always use 43,560.
• Mixing units: If you measure length in feet and width in yards, you’ll get a wrong answer. Convert all measurements to feet first.
• Forgetting to convert from square feet to acres: The result of length × width is in square feet, not acres. You must divide by 43,560.
• Rounding too early: If you round the square footage before dividing, you may get a slightly inaccurate acreage. Keep full precision until the final step.
• Assuming all plots are rectangular: This formula only works for rectangles. For triangles, circles, or irregular shapes, you need other formulas.

Tips

• If your measurements are in feet and inches, convert the inches to a decimal of a foot first (e.g., 6 inches = 0.5 ft).
• For large areas, consider using a GPS device or online mapping tool to get accurate dimensions, especially if the land is not perfectly flat.
• Double-check your measurements—a small error in length or width can lead to a noticeable difference in acreage.
• If you need the area in other units, remember: 1 acre = 4,840 square yards = 0.404686 hectares.

Troubleshooting

If the calculator gives an unexpected result:

• Check that you entered the length and width in feet, not in yards or meters. If you have measurements in other units, convert them to feet first (1 yard = 3 ft, 1 meter = 3.28084 ft).
• Ensure that the values are positive numbers. Negative values don’t make sense for a physical dimension.
• If the acreage seems too large or too small, verify the dimensions. For example, a typical suburban lot is around 0.2 acres, while a large farm can be hundreds of acres.

If you don’t know the exact dimensions:

You can estimate using a measuring wheel, a GPS app, or a satellite map with a measuring tool. For legal purposes, always get a professional survey.

Frequently Asked Questions

How many square feet are in an acre?

There are exactly 43,560 square feet in one acre. This is a standard measurement in the US and other countries that use the imperial system.

Can I use this calculator for irregularly shaped land?

No, this calculator assumes a perfect rectangle. For irregular shapes, you can divide the land into rectangles, calculate each area, and sum them, or use a more advanced method like a surveyor’s formula.

What if my measurements are in yards or meters?

Convert them to feet first. 1 yard = 3 feet, and 1 meter = 3.28084 feet. Then use the calculator.

Is an acre always 43,560 square feet?

Yes, by definition, one acre is exactly 43,560 square feet. This is a fixed conversion factor.

How do I convert acres back to square feet?

Multiply the number of acres by 43,560 to get square feet. For example, 2 acres = 2 × 43,560 = 87,120 sq ft.

What is the difference between an acre and a hectare?

A hectare is a metric unit equal to 10,000 square meters. One acre is approximately 0.404686 hectares, so one hectare is about 2.471 acres.

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in length | Length (ft) | ft | 200 | 0
in width | Width (ft) | ft | 150 | 0
out acres | Area (acres) | acres | (length * width) / 43560 | 3
out sqft | Area (sq ft) | sq ft | length * width | 0
out sqm | Area (sq m) | sq m | (length * width) * 0.092903 | 2