Acreage Calculator
Measure the size of a plot of land from its width and length, in any combination of metric or imperial units, then convert the result to acres, hectares, square metres, square miles and more — plus estimate total land cost.
✓ 9 length units supported ✓ Converts to 8+ area units ✓ Works on mobile
Acreage Calculator
Enter width and length to get area, or enter a price per unit area for a total cost.
What Is an Acreage Calculator?
Turning a width and a length into a real, usable land area.
An acreage calculator measures the size of a rectangular plot of land based on its width and length, and converts that area into whichever unit you actually need — acres, hectares, square metres, square feet, square miles, and more. It's built for the everyday reality that land is often measured in one unit (a tape measure in feet, a survey in metres) but needs to be understood or priced in another (a real estate listing in acres, a farm record in hectares).
The acre itself has had several historical definitions, but the version in common use today is the international acre, defined as exactly 4,046.8564224 square metres. This calculator uses that standard definition throughout, so every acre-based conversion is consistent with modern land records and real estate listings.
Beyond simple area conversion, this calculator can also estimate the total cost of a plot once you know a price per unit area — useful for comparing land listings priced in different units, or estimating a total budget from a known per-acre or per-hectare rate.
Acreage Formulas
The area formula and the key conversion factors this calculator applies.
The basic area formula for any rectangular plot — multiply the two side lengths together, in matching units, to get the total area.
The international acre's exact definition in square metres, which every other acre conversion in this calculator is built from.
Multiply a hectare figure by 2.471054 to get the equivalent in acres — or divide by the same factor to go from acres to hectares.
Multiply an acreage figure by 0.0015625 to get the equivalent in square miles, since one square mile contains exactly 640 acres.
How the Acreage Calculator Works
Three steps from a tape measure reading to a usable area figure.
Enter Width and Length
Type in your plot's width and length, using any of nine supported length units, from millimetres to nautical miles.
Choose Your Output Unit
Select acres, hectares, square metres, square feet, or any of several other area units for the result.
Automatic Calculation
The calculator converts both measurements to a consistent base unit, multiplies them, and converts the result to your chosen area unit instantly.
Estimate Total Cost
Optionally enter a price per unit area to see the total estimated cost of the plot, in real time.
Complete Guide to Acreage and Land Area
What the acre actually is, and how to convert it confidently.
What Is an Acre, Exactly?
The acre has a surprisingly old, practical origin: historically, it represented roughly the area a team of oxen could plough in a single day. Because it grew out of that practical, imprecise tradition, several slightly different "acre" definitions existed historically (the survey acre, for instance). Today, the international acre — defined as exactly 4,046.8564224 square metres — is the standard used in the US, UK, Canada, Australia, and other English-speaking countries, along with places like Jamaica, Ghana and India.
Hectares to Acres, and Why the Conversion Isn't Round
A hectare is a purely metric unit, defined as exactly 10,000 square metres (a 100 m × 100 m square). Because the acre and the hectare come from entirely different historical systems, the conversion factor between them isn't a clean round number: 1 hectare equals approximately 2.471054 acres, and 1 acre equals approximately 0.4047 hectares. This is exactly why most people convert between the two with a calculator rather than mental math.
Acres to Square Metres
Since 1 acre is defined as exactly 4,046.85642 square metres, converting from acres to square metres is a direct multiplication by that figure, and converting the other direction is a direct division. This conversion is especially useful when comparing a US or UK land listing (in acres) against a metric land survey or plan (in square metres).
Acres to Square Miles
One square mile contains exactly 640 acres, which makes the acres-to-square-miles conversion factor exactly 1 ÷ 640 = 0.0015625. This relationship is a holdover from historical land surveying in the US, where land was often divided into square-mile "sections," each containing exactly 640 acres — a system still visible in how many rural US counties are laid out today.
Working with Non-Rectangular Plots
This calculator's width-times-length formula works directly for rectangular (or square) plots. For irregularly shaped land, the most straightforward approach is to break the plot into a series of rectangles or triangles, calculate each section's area separately, and add them together — or use a surveyed area figure directly if one is already available from a land title or plat map.
Estimating Land Cost from a Price per Unit Area
Once you know a plot's area and a price quoted per acre, per hectare, or per square metre, the total estimated cost is simply the area multiplied by that price, after converting both to the same unit. This is particularly useful when comparing two land listings quoted in different units — say, one priced per acre and another per hectare — since converting both to a common unit first avoids an easy and costly comparison mistake.
Step-by-Step Acreage Examples
Eight worked calculations across common land-measurement scenarios.
Example 1 — Basic Rectangular Plot
Width = 200 m, Length = 400 m.
Example 2 — Small Residential Lot
Width = 60 ft, Length = 120 ft.
Example 3 — Hectares to Acres
Convert 20 hectares to acres.
Example 4 — Acres to Square Metres
Convert 5 acres to square metres.
Example 5 — Acres to Square Miles
Convert 1,280 acres to square miles.
Example 6 — Large Farm Plot
Width = 0.5 mi, Length = 1 mi.
Example 7 — Estimating Land Cost
A 12-acre plot is priced at $6,000 per acre.
Example 8 — Comparing Two Listings
Listing A: 3 hectares at $15,000/hectare. Listing B: 8 acres at $6,500/acre.
Quick Reference Tables
Common area conversions and plot size benchmarks.
| Acres | Hectares | Sq Metres | Sq Miles |
|---|---|---|---|
| 1 | 0.4047 | 4,046.86 | 0.0015625 |
| 5 | 2.0234 | 20,234.3 | 0.0078 |
| 10 | 4.0469 | 40,468.6 | 0.0156 |
| 100 | 40.469 | 404,686 | 0.1563 |
| 640 | 259.0 | 2,590,000 | 1 |
| Plot Type | Approx. Size |
|---|---|
| Small urban residential lot | 0.1–0.25 acres |
| Suburban house lot | 0.25–0.5 acres |
| Hobby farm | 1–10 acres |
| Small working farm | 10–100 acres |
| Large commercial farm | 100+ acres |
| Unit | Equivalent in Metres |
|---|---|
| 1 foot | 0.3048 m |
| 1 yard | 0.9144 m |
| 1 mile | 1,609.344 m |
| 1 nautical mile | 1,852 m |
Benefits of Using an Acreage Calculator
Why a dedicated tool beats manual unit conversion for land measurement.
Instant Area Calculation
Get your plot's area the moment you enter width and length, in any unit combination.
8+ Area Units Supported
Convert freely between acres, hectares, square metres, square feet, square miles and more.
9 Length Units Built In
Measure in millimetres, feet, miles, nautical miles and more without a separate conversion step.
Built-In Cost Estimator
Enter a price per acre, hectare, or square metre to see total land cost instantly.
Great for Comparing Listings
Quickly compare land priced in different units on a like-for-like basis.
Mobile-Friendly
Measure and calculate right from a job site, farm, or property viewing on any device.
Practical Applications of the Acreage Calculator
Where land-area calculations come up in real property and farming decisions.
Real Estate & Land Sales
Buyers and sellers convert listed acreage into familiar units and compare pricing across different-sized plots.
Farming & Agriculture
Farmers calculate field area to plan seed, fertilizer, and equipment needs proportional to acreage.
Construction & Site Planning
Developers and contractors calculate site area for permitting, zoning, and material estimates.
Land Surveying
Surveyors and land assessors use area conversion to prepare reports across metric and imperial systems.
Property Tax & Valuation
Local governments and appraisers use accurate acreage figures as an input to land tax assessments.
Conservation & Land Management
Land trusts and conservation organizations track protected acreage across international, metric and imperial reports.
Common Acreage Calculation Mistakes
Avoid these errors when measuring or converting land area.
Mixing units before multiplying
Multiplying a width in feet by a length in metres without converting first produces a meaningless area — always match units before calculating.
Confusing acres and hectares
A hectare is larger than an acre by a factor of about 2.47 — treating the two as interchangeable significantly over- or under-states area.
Using an outdated acre definition
Older regional "acre" definitions vary slightly — for most modern purposes, the international acre (4,046.8564224 m²) is the standard to use.
Applying width × length to irregular land
The basic rectangle formula only works for rectangular plots — irregular shapes need to be broken into smaller rectangles or triangles first.
Comparing prices without converting to the same unit
A price per hectare and a price per acre aren't directly comparable — convert both to the same area unit before judging which is the better deal.
Rounding conversion factors too early
Using an overly rounded acre-to-hectare factor (like 2.5 instead of 2.471054) introduces a small but avoidable error, especially over large areas.
Frequently Asked Questions
Everything people ask about acreage and land area conversion.
How do I convert hectares to acres?
Multiply the area in hectares by 2.471054 to get the equivalent in acres. For the reverse conversion, divide by 2.471054 instead.
How do I convert acres to square metres?
Multiply the area in acres by 4,046.85642, since one international acre is defined as exactly that many square metres.
What is 20 hectares in acres?
Approximately 49.42 acres, found by multiplying 20 by 2.471054.
What is bigger, 1 acre or 1 hectare?
1 hectare is bigger. One hectare equals about 2.471054 acres, so one acre is a little over 0.4 of a hectare.
How do I convert acres to square miles?
Multiply the area in acres by 0.0015625 (or divide by 640), since one square mile contains exactly 640 acres.
What's the formula for calculating acreage from width and length?
Area = Width × Length, using matching units, then convert the result to acres using the appropriate conversion factor for whatever unit you measured in.
How many square feet are in an acre?
One acre equals 43,560 square feet.
Can this calculator handle irregularly shaped land?
Not directly — the width × length formula applies to rectangular plots. For irregular shapes, break the land into rectangles or triangles, calculate each area separately, and add them together.
Which countries commonly use acres?
Acres are used mainly in English-speaking countries such as the US, UK, Canada, and Australia, as well as Jamaica, Ghana, and India, even though most of these countries otherwise use the metric system.
How do I estimate the total cost of a plot of land?
Multiply the plot's area by the price per unit area, making sure both are expressed in the same area unit (for example, price per acre × total acres).
What is the exact definition of an acre?
The international acre is defined as exactly 4,046.8564224 square metres, the standard definition used in most modern conversions today.
Why isn't the acre-to-hectare conversion a round number?
Because the acre originates from an older imperial land-measurement tradition and the hectare is a purely metric unit, the two systems don't align to a clean round ratio.
Is this calculator accurate?
Yes. It uses the exact international acre definition and standard conversion factors for every supported area and length unit.
Is it free to use?
Yes, the Acreage Calculator is free, with no signup required.
Does it work on mobile?
Yes. The calculator and plot diagram are fully responsive and work well on phones and tablets.
Calculate Acreage Instantly
Enter a width and length in any unit and get an exact area — and total cost — in seconds.