Diopter to Millimeter Focal Length Calculator

This calculator converts diopter (D) to millimeter (mm) focal length. It is useful for optical calculations involving lenses and other optical devices.

Input Parameters

Calculation Results

Calculation Formula

Focal Length (mm) = 1000 / Diopter (D)

Where:
Diopter (D): The optical power of a lens or mirror, measured in diopters.
Focal Length (mm): The distance from the optical element to the focal point, measured in millimeters.

Diopter to Millimeter Focal Length Calculator Calculator Usage Guide

Learn how to use the Diopter to Millimeter Focal Length Calculator calculator and its working principles

How to Use the Calculator

  1. Enter the value of the diopter (D) in the input field.
  2. Click the "Calculate" button to compute the focal length in millimeters.
  3. The result will be displayed in the Focal Length (mm) field.
  4. Click "Reset" to clear all input and result fields.

Understanding Diopters and Focal Length

Diopters (D) measure the optical power of a lens or mirror. It is defined as the reciprocal of the focal length in meters. The formula to convert diopters to focal length in millimeters is:

Focal Length (mm) = 1000 / Diopter (D)

This means that a lens with a higher diopter value has a shorter focal length, making it more powerful for magnification or bending light rays more sharply.

Applications

This calculator is useful in various fields such as:

  • Optometry and ophthalmology for lens prescriptions.
  • Photography for calculating the focal length of camera lenses.
  • Optical engineering for designing optical systems.