100% Free · No Sign-Up · Works In Your Browser
Free Floor Plan Calculator
Upload any floor plan, blueprint, or PDF. Set the scale, trace rooms with polygon and rectangle tools, and get instant square footage.
How It Works
Five simple steps from upload to finished measurement.
Upload
Drag and drop any floor plan, blueprint, or image onto the canvas. Supports JPG, PNG, and PDF files.
Scale
Draw a line along a known dimension and enter the real-world length to calibrate all measurements.
Measure
Outline rooms with polygon or rectangle tools. Area appears instantly in sq ft or sq m.
Organize
Drag measurements into named categories. Each category shows a subtotal for easy comparison.
Save
Projects auto-save to your browser. Download a JSON backup with everything included.
Features
Professional measurement tools, completely free in your browser.
Polygon Tool
Trace irregular shapes point-by-point. Right-click or click the first point to close.
Rectangle Tool
Click and drag for quick rectangular measurements.
Length Measurement
Measure linear distances between any two points.
Scale Calibration
Set a known dimension on the plan to convert pixels to real-world units.
Unit Conversion
Toggle between sq ft and sq m. Supports feet, meters, inches, and centimeters.
Categories
Group measurements by room type or project phase with subtotals.
Project Files
Download projects as JSON. Re-upload to pick up where you left off.
Auto-Save
Work is saved to local storage automatically. Close the tab and come back later.
Zoom & Pan
Scroll to zoom, drag to pan. Pinch and two-finger gestures on touch devices.
JPG, PNG & PDF
Upload images or PDFs. PDFs are rendered at high resolution via PDF.js.
Export & Import
Save and load .json files with image, measurements, categories, and scale.
100% Client-Side
All processing in your browser. No server uploads, no accounts, no tracking.
Use Cases
From real estate listings to construction take-offs.
Real Estate
- Measure room sizes from floor plan PDFs for listings
- Verify square footage for appraisals
- Calculate commercial lease areas from blueprints
Home Improvement
- Calculate flooring, carpet, and tile quantities
- Estimate paint coverage per room
- Plan kitchen and bathroom layouts
Landscaping
- Measure lawn areas for sod, seed, or fertilizer
- Size decks, patios, and driveways
- Plan garden beds and mulch coverage
Construction
- Quick take-offs from architectural plans
- Estimate drywall, insulation, and framing
- Calculate roofing area from plan views
Insurance
- Document damage areas for claims
- Verify property sizes for coverage
- Calculate replacement area for flooring and fixtures
Facility Management
- Plan office layouts and usable area
- Measure warehouse storage zones
- Calculate retail floor space for leases
Understanding Square Footage Measurement
Square footage is the area of a space measured in square feet (sq ft). It is the standard unit for describing room sizes, home listings, and construction quantities in the United States. In most other countries, square meters (sq m) are used instead. One square meter equals approximately 10.764 square feet.
In residential real estate, the most widely recognized measurement standard is ANSI Z765, published by the American National Standards Institute. ANSI Z765 defines finished square footage as living space that is above grade (above ground level), heated, and accessible from the interior of the home. Basements, garages, and unfinished attics are typically excluded from the main square footage number, though they may be listed separately.
Common mistakes when measuring square footage include forgetting to account for wall thickness, misidentifying the scale on a blueprint, and including non-living spaces like open-to-below areas or covered porches. A properly calibrated digital calculator like Areaplane reduces these errors by letting you trace exact room boundaries on the original floor plan, with the scale set once and applied consistently to all measurements.
Frequently Asked Questions
Is the floor plan calculator really free?
Yes, 100% free. There is no sign-up, no watermark, and no usage limit. Everything runs in your browser.
What file types can I upload?
You can upload JPG, PNG, and PDF files. Any floor plan, blueprint, or architectural drawing works.
How accurate are the measurements?
Accuracy depends on your scale calibration. Draw a reference line along a known dimension, enter the real-world length, and all subsequent measurements will be proportionally accurate.
Is my floor plan data private?
Yes. Your images and measurements never leave your browser. Nothing is uploaded to a server.
Can I save and come back later?
Projects auto-save to your browser's local storage. You can also download a JSON backup file to continue on another device.
Does it work on mobile?
The app works best on a desktop or tablet with a larger screen. Mobile devices are supported but the experience is optimized for bigger displays.
How do I calculate the square footage of a room?
For a rectangular room, multiply the length by the width. For example, a 12 ft x 15 ft room is 180 sq ft. For irregular rooms, divide the space into rectangles and triangles, calculate each area, and add them together. With Areaplane, you can trace any room shape on a floor plan and the area is calculated automatically.
How do I convert square feet to square meters?
Divide the area in square feet by 10.764 to get square meters. For example, 500 sq ft equals approximately 46.45 sq m. Areaplane lets you toggle between sq ft and sq m with one click.
From the Guides
Learn how to get the most out of the floor plan calculator.
How Much Sod Do I Need? Measure Your Yard in 10 Minutes
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How to Measure Square Footage from a Floor Plan
A step-by-step guide to measuring square footage from any floor plan using Areaplane.
Start measuring — it's free
Upload a floor plan and get square footage in seconds. No sign-up, no installation.