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Lensmaker's Equation

Calculate Lensmaker's Equation instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.

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. Free online calculator — no signup, works on mobile.

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 the parameter values — every field above is adjustable with a slider.
  2. The result and related metrics are calculated automatically as you type.
  3. Use the additional metrics shown (if any) where needed.
  4. Copy the result or bookmark the page.

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