FREE · CALCULATORS & CONVERTERS
Crop Factor Calculator.
Convert a focal length and an aperture to full-frame equivalents with a crop factor.
Equivalent f-number compares depth of field. Exposure stays at the marked aperture. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
- Equivalent focal length
- 75 mm
- Equivalent f-number
- 4.2
Equivalent focal length is the lens focal length times the crop factor. The equivalent f-number compares depth of field; the exposure stays at the marked aperture.
How to use Crop Factor Calculator
Pick a sensor or enter a crop factor, then the focal length and f-number marked on the lens.
How it works
Convert a focal length and an aperture to full-frame equivalents with a crop factor. Equivalent f-number compares depth of field. Exposure stays at the marked aperture. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional.
Example
A 50 mm f/2.8 lens on a 1.5× sensor.
Questions about Crop Factor Calculator
Is Crop Factor Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Equivalent f-number compares depth of field. Exposure stays at the marked aperture. Local arithmetic only. This is a quantity or geometry estimate, not a code check and not a substitute for a licensed professional. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.