Camera Crop Factor Calculator
Compare sensor diagonal and equivalent focal length against a reference format.
Your inputs
Calculation results
Formula & assumptions
Crop factor = reference diagonal/sensor diagonal; equivalent focal length = lens × crop factor.
Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.
Compare your scenarios
Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.
Using Camera Crop Factor Calculator
Compare sensor diagonal and equivalent focal length against a reference format.
- Enter sensor width, sensor height, lens focal length, reference diagonal using the units printed under each field.
- Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
- Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.
Example
Sensor width: 23.5 millimeters Sensor height: 15.6 millimeters Lens focal length: 35 millimeters Reference diagonal: 43.2666 millimeters Crop factor: 1.5339198 Equivalent focal length · millimeters: 53.687193
Questions & answers
What does Camera Crop Factor Calculator calculate?
Compare sensor diagonal and equivalent focal length against a reference format.
Which units should I enter?
Sensor width uses millimeters. Sensor height uses millimeters. Lens focal length uses millimeters. Reference diagonal uses millimeters. Convert values to these units before calculating.
Which formula does it use?
Crop factor = reference diagonal/sensor diagonal; equivalent focal length = lens × crop factor.
What does the included example show?
Sensor width: 23.5 millimeters; Sensor height: 15.6 millimeters; Lens focal length: 35 millimeters; Reference diagonal: 43.2666 millimeters. Result: Crop factor = 1.5339198; Equivalent focal length · millimeters = 53.687193.
Can I compare different settings?
Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.
Can I export the calculation?
Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.
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