What is a crop factor and why does it matter?

Crop factor is the ratio of your camera's sensor size to a full-frame 35mm sensor. It matters because it tells you how a lens's focal length and aperture will appear on your camera compared to a full-frame, helping you match exposure and field of view across different systems.

Can I use this calculator for video?

Yes. The crop factor affects both still and video by changing the effective focal length. Videographers use it to understand how a lens will frame on different sensors and to keep consistent exposure settings when switching cameras.

Do I need to know my sensor dimensions to use these tools?

It depends on the tool. Some let you input any width and height, while others offer a list of common sensor sizes. If your camera is not on the list, you will need to find the sensor dimensions from the manufacturer specs and enter them manually.

Will the calculator give me the exact aperture f-stop for my lens?

The calculator converts your lens's f-stop to what it would be on a full-frame camera. The actual aperture opening of the lens does not change, but the effective f-stop number changes because the sensor size alters how that opening is perceived.

Are these calculators free to use?

Both tools listed are free online calculators. One requires no signup, and the other is ad-supported but does not require an account to access the calculations.

Photography & Video2 options compared

Crop Factor Calculator

Calculates the effective focal length and aperture f-stop of your camera in terms of standard 35mm lenses using your camera's crop factor. Enter your camera's make and model, and the tool provides a conversion to help you understand how different focal lengths would perform on a full-frame camera. Photographers and videographers will use this calculator to determine equivalent exposure settings...

Photo and video calculators

Editors’ Top PickBased on community votes

Number Convert

numberconvert.com

Calculate your crop factor with our free online tool. Get accurate results instantly. No signup required.

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Omni Calculator
omnicalculator.com
The crop factor calculator tells you the effective focal length and aperture f-stop of your camera in terms of standa...
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Crop Factor Calculator options compared

Tool	Best for	Strengths	Limitations
Number Convert numberconvert.com	Custom sensor dimensions	No signup required Accepts any numeric sensor width/height	Manual entry needed Plain interface without visual picks
Omni Calculator omnicalculator.com	Quick sensor selection	Predefined sensor list Shows equivalent focal length and aperture	Fixed sensor options only Ads on the page

Buyer's guide

How to choose a crop factor calculator

When picking a crop factor calculator, the key decision is whether you know your exact sensor dimensions or you want to browse common formats. If you are working with a niche or custom sensor, you need a tool that lets you type in the width and height manually. If you are comparing typical consumer cameras, a dropdown list saves time and shows you the standard crop factors at a glance.

Questions

Crop Factor Calculator FAQ

What is a crop factor and why does it matter?: Crop factor is the ratio of your camera's sensor size to a full-frame 35mm sensor. It matters because it tells you how a lens's focal length and aperture will appear on your camera compared to a full-frame, helping you match exposure and field of view across different systems.
Can I use this calculator for video?: Yes. The crop factor affects both still and video by changing the effective focal length. Videographers use it to understand how a lens will frame on different sensors and to keep consistent exposure settings when switching cameras.
Do I need to know my sensor dimensions to use these tools?: It depends on the tool. Some let you input any width and height, while others offer a list of common sensor sizes. If your camera is not on the list, you will need to find the sensor dimensions from the manufacturer specs and enter them manually.
Will the calculator give me the exact aperture f-stop for my lens?: The calculator converts your lens's f-stop to what it would be on a full-frame camera. The actual aperture opening of the lens does not change, but the effective f-stop number changes because the sensor size alters how that opening is perceived.
Are these calculators free to use?: Both tools listed are free online calculators. One requires no signup, and the other is ad-supported but does not require an account to access the calculations.

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