Calculators
Floor Plan Scale Calculator
Convert measurements between a scaled floor plan and real size for architectural and metric scales.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Measuring rooms from a plan
- Drawing a layout to scale
- Checking furniture fits
- Architecture coursework
About this tool
What the Floor Plan Scale Calculator does
Floor plans are drawn to scale: 1/4 inch to 1 foot in US architectural drawings, or ratios such as 1:50 and 1:100 in metric drawings. This calculator converts a distance measured on the drawing into real size, and a real size into the length to draw.
Formula
- Architectural: real feet = drawing inches × scale ratio ÷ 12
- Metric: real metres = drawing centimetres × scale ratio ÷ 100
- Reverse the calculation to find the drawing length
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Drawing scale | 1/4 in = 1 ft (1:48) |
| Length on the drawing | 3.5 |
| Real length to draw | 14 |
| Result | Value |
|---|---|
| Real length | 14.00 |
| Length to draw | 3.50 |
How to read the result
Printed or PDF plans may not be at their stated scale. Check against a known dimension on the drawing before measuring.
A scale ruler with the same scale avoids the arithmetic for quick checks.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Every quarter inch on the drawing represents one foot of real length, a ratio of 1:48.
Each centimetre on the drawing is one metre in real life.
The drawing may have been printed at a different size from the original scale.
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