Airplanes and Rockets' history & copyright Google search American Modeler Air Trails American Aircraft Modeler Young Men Hobbies Aviation Flying Aces Saturday Evening Post Boys' Life Hobby Distributors Amateur Astronomy Engines & Motors Balsa Densities Silkspan Covering Comics Electronics My Models Model Aircraft Articles Plans Model Boat Articles Plans Model Car Articles Plans Model Train Articles Plans 1941 Crosley 03CB Radio Model helicopter articles & plans Crosswords Model Rocket Articles Plans Restoration Projects Photos Peanuts Collection Model Aircraft Articles Plans Sitemap Homepage Hints Amateur Radio Everything from the homepage Airplanes and Rockets Hero Graphic

Scale Calculator for Model Airplane Plans

This calculator was created to help calculate the copier magnification setting for scaling model airplane (or boat, or helicopter, or car, or anything) up or down.

The process is very simple.

  1) Select an object on the plans you already have (e.g., the wingspan) and measure is using length units
      available in the dropdown box. Enter that value and units (inches, meters, etc.) in the FROM area.

  2) Enter the new length and units that you want the object to be in the TO area.

  3) The % value given in the MAGNIFICATION are is the setting for the copier. It also reports the
       scale value.

Copier control panel magnification settingExample: The length of the wing on the plans you have
                now is 10 inches, and you want to increase it
                to 60 inches. The result is a required copier
                setting of 600%. The scale is 6:1 (six-to-one).

The copier control panel to the right is typical of what you would use. If you are taking your plans in to a copy center like Kinkos/FedEx or Staples, you can tell them what magnification setting to use.



Measure the length of the wing on the plan you have with you now and enter it here:Enter the desired wingspan here:This is the percentage setting for the copier (and ratio):

% =

As a real-world example, I have an original Sig Citabria kit with full-size plans that have a wingspan length of 72". I wanted to build a smaller version with a wingspan of 48", so I calculated a magnification value of 72/48 = 66.666%. Since the copier at Staples only did integer magnification values, I told them to do a 67% magnification. That resulted in a wingspan of 48.24 inches - close enough!

Airplanes & Rockets

Kirt Blattenberger, Webmaster - Airplanes and Rockets
Kirt Blattenberger
Carpe Diem!
(Seize the Day!)

Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD ...

1996 - 2026

Kirt Blattenberger
Family Websites:
RF Cafe | Equine Kingdom

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the Airplanes and Rockets website are hereby acknowledged.

Modeling Resources

Academy of Model Aeronautics (AMA) - Airplanes and Rockets
Academy of Model
Tower Hobbies logo - Airplanes and Rockets
Tower Hobbies

Horizon Hobby logo - Airplanes and Rockets
Horizon Hobby
Sig Manufacturing - Airplanes and Rockets
Sig Mfg
Brodak Manufacturing - Airplanes and Rockets
Brodak Mfg