Crop Factor Calculator
Convert focal length and aperture to their full-frame equivalents for any sensor.
Crop Factor Explained: Full Frame vs APS-C vs Micro Four Thirds →
What is crop factor?
Crop factor is how much smaller a sensor is than a full-frame (35 mm) sensor, expressed as a multiplier. APS-C is about 1.5x (1.6x on Canon), Micro 4/3 is 2x, and a 1-inch sensor is about 2.7x. It lets you compare lenses and cameras across formats on the same scale.
Equivalent focal length and aperture
Multiply the focal length by the crop factor to get the full-frame-equivalent field of view: a 35 mm lens on APS-C frames like about a 53 mm lens on full frame. Multiply the f-number by the crop factor to compare depth of field and total light gathered - f/2.8 on Micro 4/3 gives depth of field like f/5.6 on full frame.
What crop factor does not change
Equivalent aperture describes depth of field and light gathering, not exposure. A 50 mm f/1.8 still meters and exposes at f/1.8 on every format. Crop factor also does not literally change a lens's focal length - it only changes the field of view you capture because the sensor is smaller.
How this calculation works
Formula: f_equiv = f × crop
where:
f= focal lengthcrop= crop factor
Sources:
FAQ
Does crop factor change my exposure?
No. A 50 mm f/1.8 still meters at f/1.8. The equivalent aperture only describes depth of field and total light gathered, not the exposure setting.
What is the crop factor of APS-C?
About 1.5x for Nikon, Sony and Fuji, and 1.6x for Canon. Micro 4/3 is 2x.
How do I calculate equivalent focal length?
Multiply the lens focal length by the crop factor. A 35 mm lens on a 1.5x sensor frames like a 52.5 mm lens on full frame.
Does a crop sensor give more reach?
Effectively yes for distant subjects: the tighter field of view makes the subject fill more of the frame, which helps for wildlife and sports.