About MetricCanvas
MetricCanvas is a free, browser-based image measurement tool built for anyone who needs accurate real-world dimensions from a photograph, floor plan, blueprint, map, or technical drawing — without specialist software.
What the tool does
You upload an image, click two points whose real-world distance you know (a door frame, a printed scale bar, a ruler in shot), enter the measurement, and MetricCanvas establishes the scale for the entire image. From that single calibration you can draw as many measurement lines as you need, anywhere on the image. Every line shows its real-world value in metres, feet, centimetres, or any unit you choose.
The canvas is infinite and supports multiple images as independent layers. Each layer keeps its own calibration, so you can work with a site plan and a detailed floor plan side by side on the same session. Measurements can be labelled, exported as an annotated PNG, or downloaded as a CSV or TXT data table.
Who it is for
MetricCanvas is used across a wide range of fields:
- Architecture and interior design — measure floor plan scans, verify room proportions, and annotate drawings for client presentations without CAD software.
- Construction and engineering — read dimensions from blueprint scans, check material take-offs, and cross-reference measurements when the original CAD file is unavailable.
- Real estate — measure room sizes from listing photos or agency-provided plans before visiting a property in person.
- Research and science — measure features in microscopy images, satellite photographs, experimental diagrams, or any image with a known reference object.
- DIY and home improvement — photograph your space, calibrate against a tape measure, and plan furniture placement before buying materials.
- Education — a quick, free way to introduce scale, calibration, and measurement concepts using real images in class.
Privacy by design
MetricCanvas runs entirely in your browser. Your images are never uploaded to any server, never transmitted over the network, and never stored anywhere except your own device.
Session data is saved in your browser's local storage so you can close the tab and return to your work later.
Advertising
MetricCanvas is free and supported by display advertising through Google AdSense. You can control ad and analytics cookies through the cookie preferences banner.
Contact
General enquiries: hello [at] metriccanvas.app
Privacy requests: privacy [at] metriccanvas.app