Full-Frame Equivalent Focal Length
Crop factor expresses a field-of-view comparison relative to a chosen full-frame reference.
Full-Frame Equivalent Focal Length
Optics · 2 inputs
How to use this calculator
- Enter actual focal length in mm.
- Enter crop factor in ×.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Keep capture settings, physical dimensions and delivery requirements in separate columns of the job notes. A mathematically equivalent setting may change motion blur, depth of field or noise. Check an actual frame before committing an entire session to a numerical estimate.
The lens's actual focal length does not physically change.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
Related calculations
Horizontal Field of View
A rectilinear lens's horizontal angle of view follows sensor width and focal length.
Open calculator ↗Vertical Field of View
Vertical angle of view uses the sensor's shorter dimension for a landscape-oriented frame.
Open calculator ↗Sensor Diagonal
The sensor diagonal supports format comparisons and diagonal field-of-view calculations.
Open calculator ↗