Acreage Calculator
Acreage Calculator: Calculate Land Area in Acres Instantly
Whether you’re buying a property, planning a fence, or simply trying to figure out acreage from a parcel description, knowing how to measure land accurately matters. This guide explains everything you need to know — from the basic formula to using Google Maps as a free acreage calculator — so you can determine acreage with confidence.
What Is an Acre?
An acre is a unit of land area used primarily in the United States, United Kingdom, Canada, and other countries historically tied to the imperial system. One acre equals 43,560 square feet, which also converts to approximately 4,047 square meters or 0.405 hectares.
To put it in perspective: a standard American football field (without end zones) covers roughly one acre. A typical suburban lot sits between 0.10 and 0.25 acres, while farm parcels often start at one acre and go far beyond.
An acre measures area, not shape. That’s an important distinction. A perfectly square acre is about 208 feet on each side. But an acre could also be 100 feet wide and 435 feet long — same total area, completely different lot dimensions.
How to Calculate Acreage
The Basic Formula
Figuring acreage from a rectangular plot is straightforward. The calculation is based on width and length expressed in feet:
Acres = (Length in Feet × Width in Feet) ÷ 43,560
So if your lot is 150 feet long and 100 feet wide:
- 150 × 100 = 15,000 square feet
- 15,000 ÷ 43,560 = 0.344 acres
This is how the acreage calculator works for standard rectangular lots. Enter the dimensions and the product you’ve got — area expressed in square feet — is divided by 43,560 to give you the final acreage.
Acreage Calculator by Feet — Other Shapes
Not every parcel is a perfect rectangle. Here’s how to handle common irregular shapes:
- Triangle: Multiply base × height, divide by 2, then divide by 43,560
- Circle: Use π × radius² to get square feet, then divide by 43,560
- Irregular polygon (4 sides): Break it into triangles or rectangles, calculate each section separately, then add the results
For an acreage calculator with four sides that aren’t parallel, you’ll need all four side lengths and at least one diagonal or angle. The most practical solution for irregular parcels is to use a map-based measurement tool.
Unit Conversion Reference Table
The acreage converter below shows how common units relate to each other. This is especially useful when your deed or survey uses a mix of metric and imperial measurements.
| Unit | Equivalent in Acres |
|---|---|
| 1 Square Foot | 0.0000230 acres |
| 43,560 Square Feet | 1 acre |
| 1 Square Meter | 0.000247 acres |
| 4,047 Square Meters | 1 acre |
| 1 Hectare | 2.471 acres |
| 1 Square Mile | 640 acres |
| 1 Square Yard | 0.000207 acres |
Supported Input Units
A good acreage measurement tool accepts width and length expressed in any of the following units, converting automatically before calculating:
millimeters (mm) → centimeters (cm) → meters (m) → kilometers (km) → inches → feet (ft) → yards (yd) → miles (mi) → nautical miles (nmi)
If your measurements come in mixed units — say, the deed says 150 feet deep and a neighbor described the frontage in meters — the calculator handles the conversion before computing the area expressed in acres.
Acreage to Square Feet — Quick Reference
This is one of the most common lookups. Use this table instead of doing the math manually:
| Acres | Square Feet | Square Meters |
|---|---|---|
| 0.10 | 4,356 | 404.7 |
| 0.25 | 10,890 | 1,011.7 |
| 0.50 | 21,780 | 2,023.4 |
| 1.00 | 43,560 | 4,046.9 |
| 2.00 | 87,120 | 8,093.7 |
| 5.00 | 217,800 | 20,234.3 |
Converting acres to square meters or from square meters to acres uses the same 4,046.86 factor defined by the international acre standard.
How to Measure Acreage with Google Maps
One of the most searched questions around this topic is how to find acreage on Google Maps — and for good reason. It’s free, accessible from any device, and works on properties you can’t physically visit.
Using Google Maps as an Acreage Calculator
Google Maps has a built-in measurement tool that lets you calculate acreage directly on the map. Here’s how:
- Open Google Maps on a desktop browser
- Right-click on a starting point on the property
- Select “Measure distance”
- Click around the boundary of the land to trace the shape
- Close the shape by clicking the starting point — Google Maps will display the enclosed area in both square feet and acres
This makes Google Maps a practical acreage calculator map tool for lots, farms, and any parcel with visible satellite boundaries. The acreage measurement on Google Maps is approximate — useful for estimation, not for legal surveys.
Google Earth Acreage Calculator
Google Earth offers a more precise measurement experience, especially for rural or large parcels. Use the polygon ruler tool to trace property lines in satellite view. Like the Google Maps acreage estimator, results are approximate, but Google Earth tends to be more accurate for large-area acreage measurement of land.
For GPS-based acreage, dedicated acreage calculator apps on smartphones use your device’s GPS to trace property boundaries as you walk them. These GPS acreage calculators are popular with farmers, land managers, and outdoor professionals who need on-the-go acreage measurement.
Converting Hectares to Acres
If you’re dealing with international land descriptions, you’ll often see hectares rather than acres. Converting hectares to acres is simple:
Acres = Hectares × 2.471
So 10 hectares equals approximately 24.71 acres. The reverse — convert acres to hectares — uses the factor 0.4047:
Hectares = Acres × 0.4047
The question of what’s bigger — 1 acre or 1 hectare — has a clear answer: a hectare is bigger. One hectare equals about 2.47 acres, making it considerably larger than a single acre.
Lot Size Reference: What Does an Acre Look Like?
Understanding actual lot sizes helps put acreage in context. This table covers typical lot size acreage across different property types:
| Property Type | Typical Lot Size |
|---|---|
| Urban apartment parcel | Under 0.05 acres |
| Suburban single-family home | 0.10 – 0.25 acres |
| Quarter-acre suburban lot | 0.25 acres (10,890 sq ft) |
| Half-acre lot | 0.50 acres (21,780 sq ft) |
| Standard rural lot | 1 – 2 acres |
| Small hobby farm | 5 – 10 acres |
| Small commercial ranch | 50+ acres |
Frequently Asked Questions
How do you calculate acreage of land?
To calculate acreage, multiply the length and width of the land in feet to get square feet, then divide by 43,560. For example, a lot that is 200 feet long and 100 feet wide equals 20,000 square feet, which is 0.459 acres. For irregular or non-rectangular plots, break the area into simpler shapes, calculate each separately, and add the results together.
Is 200 ft by 200 ft an acre?
A 200-foot by 200-foot lot equals 40,000 square feet. Since one acre equals 43,560 square feet, a 200×200 lot is approximately 0.918 acres — just under one full acre. It is not a complete acre but very close to it.
How do I calculate lot size to acres?
Start with your lot dimensions in feet. Multiply length by width to get square feet, then divide by 43,560 to convert to acres. If your lot dimensions are in meters, multiply length by width to get square meters, then divide by 4,047 to get acres. An online acreage calculator handles all unit conversions automatically.
What is the best free land area calculator?
The best free online acreage calculator combines two modes: a dimension-based calculator (enter width and length to get acres) and a map-based tool (draw on a satellite map to measure irregular parcels). Tools that support multiple units — including feet, meters, yards, and kilometers — and display results in acres, square feet, square meters, and hectares offer the most flexibility.
Can Google Maps calculate acreage?
Yes. Google Maps has a built-in distance measurement tool that can be used to outline a parcel and display its area. Right-click on the map, choose “Measure distance,” trace the property boundary, and close the polygon. Google Maps will show the area in acres and square feet. For larger parcels, the Google Maps acreage estimator works well for rough planning, though it should not replace a professional land survey for legal or construction purposes.
What lot size is 1 acre?
One acre equals 43,560 square feet. A square one-acre lot would measure approximately 208.7 feet on each side. However, a one-acre lot can take many shapes — it could be 100 feet wide and 435 feet long, or 66 feet wide by 660 feet long. The shape affects the perimeter and fencing costs significantly, even though the total area stays the same.
Tips for Accurate Acreage Measurement
- Use survey documents when available. Your county assessor’s office or land registry often has legal lot dimensions on file.
- Don’t rely solely on reported acreage. Property lines can drift over time due to surveying discrepancies. Always measure directly for fencing, construction, or boundary-related work.
- For satellite acreage measurement, tools like Google Maps or Google Earth are best for estimation. A professional surveyor is the gold standard for legal accuracy.
- For an acreage calculator with four sides that aren’t parallel, use the diagonal method or a dedicated irregular polygon area tool.
- A GPS acreage calculator app is the most practical option when you need to measure acreage of land on-site without a tape measure.
Measuring land doesn’t have to be complicated. Whether you’re using this online acreage calculator to convert dimensions, figuring acreage from a satellite map, or converting between hectares and acres — understanding the underlying formula gives you full control over the result.