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Area Calculator is a free, browser-based tool for measuring areas and distances on any image. Upload a floor plan, map, aerial photo, satellite image, or site plan, calibrate the scale against a known distance, and draw polygons to instantly calculate area and perimeter — all without installing software or creating an account.

Every calculation happens locally in your browser. Your images are never sent to a server, which makes the tool fast, private, and suitable for sensitive documents like architectural drawings or land surveys.

Common Use Cases

Floor plans and interior design — Upload an architectural drawing, set the scale from a dimension line, and measure individual rooms, open-plan areas, or the entire floor plate. Instantly convert between square metres and square feet for international projects.

Land and property measurement — Trace plot boundaries on a cadastral map or satellite image to calculate the area of a parcel. Useful for conveyancing, planning applications, and real-estate listings where an official survey is not yet available.

Agriculture and field measurement — Draw field boundaries on an aerial photograph to estimate crop area, plan irrigation coverage, or calculate fertiliser requirements. Supports hectares and acres for common agricultural workflows.

Roofing and construction — Measure roof sections, decking areas, or footprints from drone images or architectural elevations to estimate materials, cost, or scheduling.

Ecological surveys and habitat mapping — Outline vegetation zones, wetlands, or study areas on satellite imagery to support environmental impact assessments and wildlife surveys.

Urban planning and site analysis — Quickly measure setbacks, green space ratios, car park footprints, or building envelopes on site plans without needing specialist GIS software.

How to Measure Area in 4 Steps

Upload your image. Click the Upload button or drag an image file onto the canvas. PNG, JPG, WebP, and PDF files are all supported. For multi-page PDFs you can choose which page to use.

Set the scale. Select the Scale tool, then click two points on the image whose real-world distance you already know — for example, the ends of a dimension line, a scale bar, or two property corners. Enter the real distance and unit. The tool uses this ratio to convert pixel measurements into real-world values for every shape you draw.

Draw your shapes. Select the Draw tool and click to place vertices around the area you want to measure. Click the first vertex again (or double-click) to close the polygon. You can draw as many separate shapes as you like — each gets a unique colour and label. Drag any vertex to fine-tune the boundary.

Export your results. Area and perimeter appear instantly in the sidebar. Copy the results to the clipboard, save a labelled PNG image, export a PDF report, or download a CSV file for use in spreadsheets. You can also save the entire project as a JSON file and reload it later.

Frequently Asked Questions

Is Area Calculator free?

Yes, completely free. There are no subscriptions, usage limits, or premium tiers. The tool is supported by advertising, which keeps it free for everyone.

Do my images get uploaded to a server?

No. All processing happens in your browser using the HTML5 Canvas API. Your images, measurements, and project files never leave your device. This also means the tool works offline once the page has loaded.

How accurate are the measurements?

Accuracy depends on the quality of your scale calibration and how precisely you draw the polygon vertices. If the reference distance you enter is accurate and the image is an undistorted top-down view (orthographic projection), results are typically accurate to within 1–2% for well-drawn shapes. Distorted or perspective images will produce less accurate results.

What image formats are supported?

PNG, JPEG, WebP, and PDF. For PDFs, a page picker lets you choose which page to work on. There is no maximum file size enforced by the tool, though very large images may be slow to load depending on your device.

Can I measure multiple areas at once?

Yes. Draw as many polygons as you need on a single image. Each shape is listed separately with its own area and perimeter. When two or more shapes are present, the sidebar also shows the combined total area.

What units of measurement are available?

Metres, kilometres, feet, yards, and miles. Area is shown in the corresponding square unit, and large areas are automatically converted to hectares (for metric) or acres (for imperial). You can switch units at any time without redrawing.

Can I save my work and come back later?

Yes. Use the Save Project button to download a JSON file containing your image and all shapes. Load it again at any time with the Load Project button. The app also auto-saves your last session to browser storage so it is restored automatically on your next visit.

Why Use Area Calculator?

Most dedicated area measurement tools are either expensive desktop applications, require registration, or are so limited in their free tier that they are not practical for everyday use. Area Calculator was built to fill that gap: a capable, no-friction tool that respects your privacy and works on any device with a modern browser. There is nothing to install, no account to create, and no data to hand over.