---
title: "Floor Plan Scale Calculator: 1:50, 1:100 and More"
url: https://floorto3d.com/tools/floor-plan-scale-calculator/
description: "Turn a length measured on a floor plan into the real size at 1:50, 1:100 or any scale, the other way round, or find the scale from one known dimension."
---

# Floor plan scale calculator

Measured a wall on the drawing? Get its real length at 1:50, 1:100 or any scale. Or find the scale of a plan from one dimension written on it.

Scale

1:

On the drawing → real

Measured on the plan,

In reality

Find the scale

Real length,

Drawn on the plan,

The scale is

## How plan scales work

A scale of 1:100 means every length on the drawing is a hundredth of the real one. To get a real length, multiply what you measured on the paper by the scale’s second number; to draw something, divide. Keep the units the same on both sides: 36 mm on a 1:100 plan is 3,600 mm, which is 3.6 m.

The scale printed on a plan is only true on paper at the size it was drawn for, usually A3 or A4. A PDF on screen or a plan printed “fit to page” has a different scale, so check it against a dimension written on the drawing before relying on it. More on reading the numbers in [how to read floor plan dimensions](https://floorto3d.com/guides/floor-plan-dimensions/) and [how to read a floor plan](https://floorto3d.com/guides/how-to-read-a-floor-plan/).

## Got a plan? See it in 3D.

Drop the floor plan from the listing or the developer and it opens as a furnished 3D flat in seconds: walk through it, check the sun, try a renovation style.

[Upload your floor plan](https://app.floorto3d.com/#from=tool%3Ascale%3Ainline) [No plan at hand? Get a sample](https://floorto3d.com/samples/warsaw-flat-plan.png)

$29 a flat, paid after you see it · Read in seconds · No install

## Questions, answered

### What does 1:100 mean on a floor plan?

One unit on the drawing is 100 of the same units in reality: 1 cm on the plan is 100 cm, or 1 m, in the flat. At 1:50, 1 cm is 50 cm; at 1:200, 1 cm is 2 m.

### How do I find the scale of a floor plan with no scale written on it?

Measure on the drawing a wall whose real length is written beside it, then divide the real length by the drawn one, in the same units. A 3.6 m wall drawn 36 mm long is 3,600 ÷ 36 = 1:100. The calculator’s third box does exactly this.

### Can I scale a plan I see on a screen?

Not by its printed scale: zooming changes the size on screen. Use a known dimension instead, such as a written room size or a door, about 80–90 cm wide in most flats, and work out the scale from that.

### What are the usual scales for house plans?

1:50 for a single flat or room in detail, 1:100 for a whole flat or house floor, 1:200 or 1:500 for a building or site. US plans write scales as 1/4″ = 1′-0″ (which is 1:48) or 1/8″ = 1′-0″ (1:96).

## Stop squinting at the plan. Walk in.

It takes less time than reading this page, and you see your plan read before you pay anything.

[Upload your floor plan](https://app.floorto3d.com/#from=final%3Atool%3Ascale) [No plan at hand? Get a sample](https://floorto3d.com/samples/warsaw-flat-plan.png)

$29 a flat, paid after you see it · Read in seconds · No install