Telescope Magnification Calculator

Objective lens diameter (mm):

Eyepiece focal length (mm):


About Telescope Magnification Calculator (Formula)

A telescope magnification calculator is a tool that calculates the magnification of a telescope based on the objective lens diameter and eyepiece focal length. The formula used to calculate the magnification is:

magnification = objective lens diameter/eyepiece focal length

For example, if the objective lens diameter is 50mm and the eyepiece focal length is 10mm, the magnification would be 5x (50/10 = 5). Keep in mind that this is a simplified formula, and other factors such as the telescope’s focal ratio, the field of view, and aberrations also play a role in the final image quality.

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