Crop Factor Calculator

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Calculates the equivalent focal length and aperture effect for cameras with sensors smaller than full-frame (35mm).

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Lens Focal Length (mm), Lens Aperture (f-number), and Crop Factor in the units shown.

Step 2

Read Equivalent Aperture (f-number) and Equivalent Focal Length (mm) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Lens Focal Length (mm): 50; Lens Aperture (f-number): 1.8; Crop Factor: 1.6

Equivalent Aperture (f-number): 2.88; Equivalent Focal Length (mm): 80 mm

Lens Focal Length (mm): 35; Lens Aperture (f-number): 1.8; Crop Factor: 1.5

Equivalent Aperture (f-number): 2.7; Equivalent Focal Length (mm): 52.5 mm

Lens Focal Length (mm): 25; Lens Aperture (f-number): 1.4; Crop Factor: 2

Equivalent Aperture (f-number): 2.8; Equivalent Focal Length (mm): 50 mm

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