Macro Magnification
Calculate Macro Magnification instantly with the exact formula and a worked example.
Macro Magnification
Focal lengthmm
Subject-to-lens distancemm
Magnification
1×
Reproduction ratio
1:1
Image distance
200mm
Field width (36 mm sensor)
36mm
Shot type
True macro (1:1 or larger)
More about: Macro Magnification
What it calculates
The “Macro Magnification” calculator computes Magnification in × from 2 parameters: focal length (mm), subject-to-lens distance (mm).
Used by photographers and videographers when setting up a shoot.
Example calculation
With parameters Focal length = 100 mm, Subject-to-lens distance = 200 mm the result is 1 × (Thin-lens model).
How to use
- Enter focal length and subject-to-lens distance — each field above is adjustable with a slider.
- Magnification (×) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Macro Magnification calculated?
The Macro Magnification calculator computes Magnification (in ×) from focal length, subject-to-lens distance. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Macro Magnification 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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