Acreage Calculator by Feet
Know the dimensions of your land in feet? Enter the length and width in feet below and this calculator instantly returns the acreage — along with square feet, square meters and hectares. Perfect for rectangular lots, fields and plots.
Length × Width → Acreage
Assumes a rectangular plot. For irregular shapes, measure on a map instead.
How to Calculate Acreage from Feet
For a rectangular plot, acreage is calculated in two steps:
1. Square feet = Length (ft) × Width (ft) 2. Acres = Square feet ÷ 43,560
For example, a lot that is 200 ft × 200 ft is 40,000 square feet. Divide by 43,560 and you get 0.918 acres.
Common Lot Dimensions in Acres
| Dimensions (feet) | Square Feet | Acres |
|---|---|---|
| 50 × 100 | 5,000 | 0.11 |
| 100 × 100 | 10,000 | 0.23 |
| 100 × 150 | 15,000 | 0.34 |
| 150 × 200 | 30,000 | 0.69 |
| 200 × 200 | 40,000 | 0.92 |
| 208.71 × 208.71 | 43,560 | 1.00 |
| 300 × 300 | 90,000 | 2.07 |
| 660 × 660 | 435,600 | 10.00 |
A perfectly square one-acre lot measures about 208.71 ft on each side.
When to Use This vs. a Map
This calculator assumes a rectangular plot defined by a length and a width. That’s ideal for regular building lots and fields. If your land is irregular, angled or has more than four sides, measuring it directly on satellite imagery is far more accurate — use the acreage calculator map to trace the real boundary, or the four-sides acreage calculator if you have four different edge lengths.
Frequently Asked Questions
How do I calculate acres from feet?
Multiply length in feet by width in feet to get square feet, then divide by 43,560 to get acres. For example, 200 ft × 200 ft = 40,000 ft² ÷ 43,560 = 0.918 acres.
What are the dimensions of one acre in feet?
One acre is 43,560 square feet. A square acre measures about 208.71 ft on each side, but an acre can be any rectangle whose sides multiply to 43,560 — for example 100 ft × 435.6 ft.
How many acres is 100 x 100 feet?
A 100 ft × 100 ft plot is 10,000 square feet, which equals about 0.2296 acres.
Does this work for irregular land?
This calculator assumes a rectangle. For irregular or many-sided plots, measure the boundary directly on a map with the Marea acreage calculator for an accurate result.
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