Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Photography
Magnification Ratio Calculator
Calculate the magnification ratio of a lens at a given subject distance β the ratio of subject image size on the sensor to actual subject size. Use it for macro photography planning to predict how large your subject will render and to choose between dedicated macro lenses, extension tubes, or close-up filters.
Fill in the required fields to see your result.
Optics
Depth of Field Calculator
Compute the total depth of field for any camera and lens combination using focal length, f-number, focus distance, and circle of confusion. Use it to plan sharp focus zones before a shoot.
Fill in the required fields to see your result.
Key differences
| Magnification Ratio Calculator | Depth of Field Calculator | |
|---|---|---|
| Category | Photography | Optics |
| Inputs required | 2 | 4 |
| Result | Magnification Ratio (:1) | Depth of Field (mm) |
| What it does | Calculate the magnification ratio of a lens at a given subject distance β the ratio of subject image size on the sensor to actual subject size. Use it for macro photography planning to predict how large your subject will render and to choose between dedicated macro lenses, extension tubes, or close-up filters. | Compute the total depth of field for any camera and lens combination using focal length, f-number, focus distance, and circle of confusion. Use it to plan sharp focus zones before a shoot. |