About the Magnification Calculator
Magnification from image and object size or distances, for lenses, mirrors and microscopes.
Also known as: magnification formula, image size calculator, linear magnification.
How to use this calculator
- Enter calculate from and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
m = h_image / h_object = −v/u
Worked example
Using the values pre-filled in the calculator above:
- Calculate from: Image and object size
- Image height = 6
- Object height = 2
the calculator returns:
- Magnification: 3 ×
- Absolute magnification: 3
- Orientation: Upright
- Image: Larger than object