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Lensmaker's Equation

Calculate Lensmaker's Equation instantly with the exact formula and a worked example.

Lensmaker's Equation

Object distancecm
Lens focal lengthcm
Image distance
15cm
1/f = 1/d₀ + 1/dᵢCalculate Lensmaker's Equation instantly with the exact formula and a worked example.

More about: Lensmaker's Equation

What it calculates

The “Lensmaker's Equation” calculator computes Image distance in cm from 2 parameters: object distance (cm), lens focal length (cm).

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Object distance = 30 cm, Lens focal length = 10 cm the result is 15 cm (1/f = 1/d₀ + 1/dᵢ).

How to use

  1. Enter object distance and lens focal length — each field above is adjustable with a slider.
  2. Image distance (cm) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Lensmaker's Equation calculated?
The Lensmaker's Equation calculator computes Image distance (in cm) from object distance, lens focal length. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Lensmaker's Equation calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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