Macro Image Magnification Ratio Calculator
Macro Image Magnification Ratio is intended for the specific photography task described by its name. Enter subject image size mm, real subject size mm to calculate a result expressed in x. The formula works entirely in your browser and needs no account or external API. Use sensor-plane image size, not display pixel size. This estimate is useful for comparing scenarios when the supplied measurements follow the stated assumptions.
How to use this calculator
- Measure subject image size mm in the units indicated on the input label.
- Enter Real subject size mm.
- Read the x result, then compare alternative inputs to evaluate your own situation.
Macro Image Magnification Ratio formula
image/subject (x).
- The expression image/subject combines Subject image size mm, Real subject size mm. Follow the units on each input: the answer is expressed in x.
- Use sensor-plane image size, not display pixel size.
Worked examples
Worked example: Macro Image Magnification Ratio
Use these sample measurements: Subject image size mm = 12, Real subject size mm = 8.
Compute image/subject.
Using the example inputs, the result is 1.5 x. Use this value to verify the formula before changing the measurements.
Understanding the result
Interpret the output as x; it is not a measurement taken directly from a physical system.
Use sensor-plane image size, not display pixel size.
Important notes
Use sensor-plane image size, not display pixel size.
Review the input units, any required legal or engineering rules, and unusual edge cases before acting on this estimate.
Frequently asked questions
What does Macro Image Magnification Ratio calculate?
It evaluates image/subject to produce x from the measurements you enter. For the example values shown, the result is 1.5 x.
Which assumptions matter most?
Use sensor-plane image size, not display pixel size.
Can I compare two scenarios?
Yes. Enter another set of measurements in the same units and compare the two outputs.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.