Scale Conversion Calculator

This is an online scale length converter that calculates the actual length and the scale length according to the scale ratio, scale ratio could be set by yourself, supports different length units, including imperial units and metric units. With visual graphic and formula, it let us more easily understand the calculation process and the result.

How to use this scale converter

Set the scale ratio according your needs, such as 1:10, 1:30, 35:1, 1:100, 1:200, 1:500
Select the unit of real length and scale length
Support multiple unit coversions, such as mm, cm, meter, km, inches, feet, yards, miles, nautical miles
Using different units will automatically convert the result
Enter the number of real length, the scale length will be calculated automatically.
Enter the number of scale length, the real length will be calculated automatically.

How to calculate scale size

To calculate the scale length, use real length multiply the scale factor of it, then divide the scale factor of scale length, for example

Scale ratio 1:12

Real length : 240 inch
Scale length : 240 inch × 1 ÷ 12 = 20 inch

Room scale size at scale 1:100

A room of 5.2 meters by 4.8 meters, what is the scale size for the building plan at scale 1:100 ?

First, we can convert the unit from meter to centimeter.
5.2 m = 5.2 × 100 = 520 cm
4.8 m = 4.8 × 100 = 480 cm
Then, convert by scaling
520 cm × 1 ÷ 100 = 5.2 cm
480 cm × 1 ÷ 100 = 4.8 cm
So we have to draw a room of 5.2 x 4.8 cm

To calculate the real length, use scale length multiply the scale factor of it, then divide the scale factor of real length, for example

Scale ratio 1:200

Scale length : 5 cm
Real length : 5 cm × 200 ÷ 1 = 1000 cm

Door actual width at scale 1:50

On the building plan the width of the front door is 18.6 mm.
and the scale of the plan is 1:50,
what is the actual width of that door ?

First, we convert the unit from millimeter to centimeter.
18.6 mm = 18.8 ÷ 10 = 1.86 cm
Then, convert by scaling
1.86 cm × 50 ÷ 1 = 93 cm
So the actual width of door is 93 cm

If you want to know the scale factor(ratio) between two lengths, try this scale factor calculator, It helps us calculate the scale ratio more easily.

What is a scale in math ?

In math, the term scale is used to represent the relationship between a measurement on a model and the corresponding measurement on the actual object.

What is a scale in map ?

Scale is the ratio that defines the relation between the actual figure and its model. It is used in maps to represent the actual figures in smaller units. For example, a scale of 1:5 means 1 on the map represents the size of 5 in the real world. The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground.

Using your familiar native language

I know many people prefer use their native language, we hope to provide a more user-friendly experience, are you willing to offer a native language version for your country ? We are looking for volunteer to improve the content in your native language, if you are interested to help this, please visit this translation page. Below are some other language version.

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Online rulers

Actual size online ruler : the most accurate size ruler on the web.
Metric scale ruler : variable scale ruler with metric units(cm, m, km)
Imperial scale ruler : variable scale ruler with imperial units(in, ft, yd, mi)
Online Protractor : use this transparent protractor to measure the angle of anything

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Scale Ratio	:
Real Length
Scale Length