Goal amount for this year: 518 USD, Received: 295.00 USD (57%)
Scalemotorcars is a free and open community devoted to scale modeling. The heart and soul of Scalemotorcars is our global community of over 10,000+ contributors, millions of readers, and donors like yourself all united to share unlimited access to reliable information. Your donations keep Scalemotorcars freely available to everyone.

This years bandwidth costs, hosting service, domain registration, software licensing fees, and maintenance cost have a balance of $518 due by the end of August. Please help us keep Scalemotorcars growing by making a donation today.
Thank you.

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Adjustable Scale Ruler

Your browser does not support the canvas element.

PPI : , scale ratio : (1"=1'-0")

Ruler Adjuster :

This is an online scale ruler that can be calibrated to actual size with a scale ratio that can be set yourself. You can set the scale ratio according to your needs, e.g.. 1:4, 1:8, 1:12...etc. In order to get the most accurate measurement, we bly recommend that you calibrate the ruler first, and set the actual pixels per inch for your device.

How to use this imperial scale ruler ?
  • Calibrate the ruler to actual size.
  • Set the scale ratio, for example "1:12"
  • Black number is inches(in), red number is feet(ft.), blue number is yards(yd.).

How to adjusting this ruler to actual size
There are some ways to know the pixels per inch(PPI) of your device.
  1. The easiest way to figure your PPI is to visit this site. PDI Love. For example my monitor is 1920 x 1080 and is 25" diagonally with a PPI of 88.
  2. The most accurate way is to simply use a real ruler against your screen and adjust the setting until the top of the ruler is exactly the same as your real ruler then click Save PPI.

Save the pixels per inch (PPI) according your own device, then you can use this ruler next time. If you clear your browser cache you will need to set it again.
Pixels per inch :

Scale Conversion Calculator

If you would like calculate the scale length or real length, we have a scale calculator, it can help you quickly and easily calculate the scale length, your welcome to try it.

Quick Scale Calculator

Scale Calculator   Scale Factor   Real Size:     + Deluxe Scale Calculator
  1: th   Which equals Convert measurement: Reset or clear:  
  Any Scale   Scale Size:     + Deluxe Metric Calculator