Your result
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Enter your values, then click Calculate result.How this calculator helps
Calculate acreage and area units from an ordered measured plot boundary in feet or metres, with crossing-boundary validation. Enter one x,y coordinate pair per line or separate pairs with semicolons. Walk around one boundary in either direction and list each successive corner in that order. Three to one hundred vertices are supported. You may repeat the first corner at the end, but it is not required. The final edge closes automatically from the last unique corner back to the first.
How to use it
- 1
Select the correct input roles for acreage calculator and enter the values described below. The demonstration defaults illustrate the method; they are not independently verified personal measurements or live market data.
- 2
Review planar length units and the original source record. Match units, signs and the chosen mode before submitting, rather than relying on a familiar-looking default number.
- 3
Click Calculate result to submit the current fields. Editing an input preserves the prior submitted output until you calculate again; the pending-change message distinguishes that saved output from the new values.
- 4
Check the labeled output against the worked example and independent verification steps. Review measurement limits before using the result in another document, and keep the complete input basis with a copied answer.
Formula and methodology
Polygon area = ½|Σ(xᵢyᵢ₊₁−yᵢxᵢ₊₁)|. Convert feet² through 0.3048² to m²; one acre = 4046.8564224 m².
The calculator applies the displayed arithmetic to the values entered on this device. It does not silently load a local tax rate, currency conversion or commercial assumption.
Worked calculation example
A rectangle with boundary vertices (0,0), (100,0), (100,200), (0,200) in international feet encloses 20000 square feet. That equals about 0.459136823 acres and 1858.0608 square metres. Listing those same vertices in the opposite boundary order preserves area. Shuffling them into crossing order is rejected rather than reported as an apparent zero-area plot.
How to interpret your result
The boundary may be concave, but nonadjacent edges must not cross or touch. Consecutive duplicate points and zero-area boundaries are rejected. The implementation checks those conditions before taking the absolute signed area. A single plot with an internal hole is not represented by one list; calculate justified separate simple regions and subtract the excluded region separately. Do not join unrelated parcels with invented connecting edges.
For different inputs or formulas, use Square Footage Calculator; Length Conversion Calculator; Slope Calculator.
Related questions this calculator covers
- acreage calculator
Scenario comparison
| Scenario | What it shows |
|---|---|
| Rectangle | 100 by 200 feet gives 20000 ft². |
| Triangle | (0,0),(100,0),(0,100) encloses 5000 ft². |
| Boundary reversal | reversing all vertices preserves area. |
Common mistakes to avoid
- Using geographic degrees as measured linear coordinates.
- Shuffling vertices instead of walking the boundary.
- Converting area with a linear factor rather than its square.
Compare a rectangular or triangular test boundary with elementary geometry. Reverse the vertex list and translate every coordinate by a common offset; both should preserve area. Convert square feet to acres independently by dividing by 43560. Confirm the actual measurement system and boundary evidence separately, since arithmetic checks cannot certify a property survey.
Authoritative reference. Method and scope reviewed on 5 October 2026. SolvePilot provides the original worked example and bounded browser implementation. Editorial and arithmetic review by Mohammad Qasim does not certify user measurements, a real contract or an individual professional decision. The reference supplies method, unit or source-record context; it does not approve this implementation or its inputs.What can affect the result?
Ordered boundary coordinates
Enter one x,y coordinate pair per line or separate pairs with semicolons. Walk around one boundary in either direction and list each successive corner in that order. Three to one hundred vertices are supported. You may repeat the first corner at the end, but it is not required. The final edge closes automatically from the last unique corner back to the first.
Planar length units
Coordinates must be Cartesian distances in international feet or metres using one consistent origin and axis system. These are not latitude and longitude degrees, and the calculator does not project a map. Negative coordinates are allowed because the origin can lie outside the plot. Coordinate magnitudes are bounded to one million. Translating every corner by the same offset preserves area, provided numerical precision remains adequate.
Simple polygon validation
The boundary may be concave, but nonadjacent edges must not cross or touch. Consecutive duplicate points and zero-area boundaries are rejected. The implementation checks those conditions before taking the absolute signed area. A single plot with an internal hole is not represented by one list; calculate justified separate simple regions and subtract the excluded region separately. Do not join unrelated parcels with invented connecting edges.
Area conversions
The primary result is acres, with square metres, square feet and hectares as supporting units. One acre is 43560 square international feet, and one hectare is 10000 square metres. These are area units, so a linear conversion factor must be squared before applying it. The output is horizontal planar area, not slope-surface area or a volume. It includes no building setbacks, ownership exclusions or zoning deductions.
Measurement limits
The calculator does not establish a legal property boundary or replace a survey. Coordinate accuracy, projection, rounding and corner placement determine the reliability of the supplied polygon. Historical survey-foot records need their own correctly established conversion before using the international-foot option. Keep the coordinate list and unit with the result. A detailed number cannot compensate for a plot that was measured or traced inaccurately.
Privacy and browser processing
Values entered on this page are processed in the current browser session. SolvePilot does not require an account and does not receive the values entered into the calculator. Refreshing or closing the page clears the working values unless the browser itself restores a previous session. Avoid entering identifying or account information because the calculation needs summary values only.
Accuracy and verification
Accuracy depends first on input quality. Confirm definitions, scales, dates and source information before entering a value. Keep an independent record of any result used for planning because this page does not create an official statement or retain a calculation history.
Limits of this estimate
The calculator does not establish a legal property boundary or replace a survey. Coordinate accuracy, projection, rounding and corner placement determine the reliability of the supplied polygon. Historical survey-foot records need their own correctly established conversion before using the international-foot option. Keep the coordinate list and unit with the result. A detailed number cannot compensate for a plot that was measured or traced inaccurately.
Sources and review information
Frequently asked questions
Can I use latitude and longitude?＋
No. Convert through an appropriate projected coordinate system before this planar worksheet; geographic degrees are not linear feet or metres.
Can the plot be irregular?＋
Yes, if it is one simple polygon whose vertices follow the actual boundary without crossing or touching nonadjacent edges.
Should I repeat the first point?＋
It is optional. A final point matching the first is removed and the boundary is closed automatically.
Does reversing the list change area?＋
No. It reverses signed orientation, but the reported area uses its absolute magnitude.
Does acreage certify ownership?＋
No. This is area arithmetic for supplied coordinates, not a survey, title assessment or legal parcel determination.