Acreage Calculator
An acreage estimate begins with the shape on the ground, not with a unit conversion table. This calculator takes the length and width of a rectangular plot, converts the chosen length unit to feet, multiplies the sides, and reports the area in acres. It also displays square feet, hectares, and square meters, so the same measurement can be checked against a US real estate listing, a farm budget, a metric site plan, or a land-improvement estimate.
The page is written for practical land questions: How many acres are in a 300 ft by 200 ft parcel? How much would that land cost at a quoted price per acre? How does a meter-based survey compare with a county listing written in acres? If you already know the area and only need unit changes, the area converter is broader. For direct acre conversions, compare the acres to square feet converter and the acres to hectares converter. For a general rectangle-oriented land page, see the land area calculator.
What this acreage calculator does
The calculator assumes a rectangular plot. You enter a plot length, a plot width, a shared length unit, and optionally a price per acre. The supported length units are feet, yards, meters, and kilometers. The code converts each side to feet using these factors: 1 yard = 3 feet, 1 meter = 3.280839895 feet, and 1 kilometer = 3,280.839895 feet. It then multiplies the converted sides to get square feet and divides by 43,560 to get acres.
That order matters. Acres measure area, so a single frontage length is not enough. A lot that is 300 feet deep and 200 feet wide has a very different area from a strip that is 300 feet long and 20 feet wide. The calculator mirrors the same rectangular logic used by many quick real estate sketches, seed estimates, fencing budgets, and preliminary development comparisons.
Land unit definitions
An acre is a land-area unit used heavily in the United States, the United Kingdom, and many property markets influenced by acre-based records. One international acre is 43,560 square feet, or 4,046.8564224 square meters. A hectare is a metric land unit equal to 10,000 square meters, so one acre is about 0.40468564224 hectares. An are is the smaller metric land unit equal to 100 square meters; 100 ares make one hectare. A cent is common in parts of South Asia and is one hundredth of an acre, equal to 40.468564224 square meters. A gaj is a South Asian name commonly used with square yards in land and construction contexts; one square gaj is treated as one square yard on many conversion pages, including our gaj to square yard converter.
Formula
For a rectangular plot measured in feet:
If the chosen unit is not feet, the calculator first converts both sides:
The optional value estimate follows the computed acreage:
Worked example matching the calculator
Use the default acreage example: length 300, width 200, unit feet, and price per acre 12,000. Because the unit is feet, the conversion factor is 1 for both sides. The area is 300 · 200 = 60,000 square feet. Dividing by 43,560 gives 1.377410468 acres, which the result panel rounds to 1.3774 acres. The metric rows are derived from the same acre value: 1.377410468 · 0.40468564224 = 0.557418 hectares, shown as 0.5574 ha, and 1.377410468 · 4,046.8564224 = 5,574.18 square meters. With a price of 12,000 per acre, the estimated total is 1.377410468 · 12,000 = 16,528.93.
Reference table
| Rectangular plot | Square feet | Acres | Hectares | Typical use |
|---|---|---|---|---|
| 100 ft by 100 ft | 10,000 | 0.2296 | 0.0929 | Small residential lot |
| 300 ft by 200 ft | 60,000 | 1.3774 | 0.5574 | Rural home site or field check |
| 660 ft by 660 ft | 435,600 | 10.0000 | 4.0469 | Ten-acre square parcel |
| 1,000 ft by 500 ft | 500,000 | 11.4784 | 4.6452 | Larger farm or development tract |
| 100 m by 50 m | 53,819.55 | 1.2355 | 0.5000 | Metric survey rectangle |
Regional and professional uses
US real estate listings often quote small city lots in square feet and rural land in acres. Agriculture uses acres for seed, fertilizer, irrigation, grazing, and yield comparisons. Metric land records may prefer hectares or ares, especially for farms, parks, and planning maps. South Asian land records may introduce cents, gaj, katha, or other local units, so it is wise to convert the final area rather than guess from a familiar name. When a deed, tax record, and listing disagree, confirm whether each source is describing gross land area, usable area, frontage, built-up floor area, or a rounded marketing figure.
Common pitfalls
The biggest mistake is forgetting that area equals length times width. Do not divide a frontage length by 43,560. Convert both sides to the same length unit, then multiply. Another mistake is assuming the rectangle represents a legal parcel. Real lots can include curves, angled boundaries, access easements, wetlands, setbacks, or steep ground that changes usable acreage. Rounding is also important: carrying four to six decimal places during the calculation and rounding only the final display avoids visible differences when several parcels are added together.
Sources
- NIST, Guide for the Use of the International System of Units — area-unit conversion factors and SI usage guidance.
- NIST, Metric SI units — official overview of SI units and metric practice.
- BIPM, The International System of Units brochure — SI definitions and accepted usage for metric units.