Crop Factor Calculator
Crop factor, equivalent focal length and f-number, and horizontal, vertical and diagonal field of view for eleven sensor sizes or a custom one. How it works
Use the Crop Factor Calculator
About the Crop Factor Calculator
A 50 mm lens on a full-frame camera has a field of view of 39.60° horizontal, 26.99° vertical and 46.79° diagonal. On the tool’s Canon APS-C sensor (22.3 × 14.9 mm) the crop factor is 1.61×, so the same lens frames like an 80.7 mm lens on full frame. Crop factor is the full-frame diagonal, 43.27 mm, divided by the sensor’s diagonal.
Crop factor and what a 50 mm lens equals on each sensor
| Sensor | Size (mm) | Diagonal (mm) | Crop factor | 50 mm lens equals | Horizontal field of view |
|---|---|---|---|---|---|
| Full frame | 36 × 24 | 43.27 | 1.00× | 50.0 mm | 39.60° |
| APS-C (Canon) | 22.3 × 14.9 | 26.82 | 1.61× | 80.7 mm | 25.14° |
| APS-C (Sony, Nikon) | 23.5 × 15.6 | 28.21 | 1.53× | 76.7 mm | 26.45° |
| Micro Four Thirds | 17.3 × 13 | 21.64 | 2.00× | 100.0 mm | 19.63° |
| Medium format | 43.8 × 32.9 | 54.78 | 0.79× | 39.5 mm | 47.31° |
| 1-inch | 13.2 × 8.8 | 15.86 | 2.73× | 136.4 mm | 15.04° |
| APS-H (Canon) | 27.9 × 18.6 | 33.53 | 1.29× | 64.5 mm | 31.18° |
| Super 35 (4-perf) | 24.89 × 18.66 | 31.11 | 1.39× | 69.5 mm | 27.95° |
| Medium format 645 | 56 × 42 | 70.00 | 0.62× | 30.9 mm | 58.50° |
| 1/1.7-inch | 7.6 × 5.7 | 9.50 | 4.55× | 227.7 mm | 8.69° |
| 1/2.3-inch | 6.17 × 4.55 | 7.67 | 5.64× | 282.2 mm | 7.06° |
The eleven presets in the tool, at its two-decimal rounding. Crop factor = 43.27 mm ÷ the sensor diagonal.
Field of view on full frame by focal length
| Focal length | Horizontal | Vertical | Diagonal |
|---|---|---|---|
| 14 mm | 104.25° | 81.20° | 114.18° |
| 24 mm | 73.74° | 53.13° | 84.06° |
| 35 mm | 54.43° | 37.85° | 63.44° |
| 50 mm | 39.60° | 26.99° | 46.79° |
| 85 mm | 23.91° | 16.07° | 28.56° |
| 135 mm | 15.19° | 10.16° | 18.21° |
| 200 mm | 10.29° | 6.87° | 12.35° |
Rectilinear lens model, 36 × 24 mm sensor: angle = 2 × arctan(side ÷ (2 × focal length)).
How to use this tool
- Enter the focal length of your lens in millimeters, from 1 to 2000.
- Choose a sensor preset, or choose Custom and type the width and height in millimeters, each from 1 to 100. Optionally type the lens aperture, from f/1 to f/64.
- Read the crop factor, the equivalent focal length and the horizontal, vertical and diagonal field of view. The diagram draws the full-frame outline at the same scale as the sensor you picked. With an aperture entered, the equivalent f-number for depth of field shows as well, and a link opens the depth of field calculator with the same lens and sensor.
Frequently asked questions
- What is the crop factor of APS-C, Micro Four Thirds and 1-inch sensors?
- With this tool’s sensor sizes, Canon APS-C is 1.61×, Sony and Nikon APS-C 1.53×, Micro Four Thirds 2.00×, 1-inch 2.73× and the 43.8 × 32.9 mm medium-format preset 0.79×, which is below 1 because that sensor is larger than full frame. Published figures are usually rounded, 1.6 for Canon APS-C, 1.5 for other APS-C and 2.0 for Micro Four Thirds, and the second decimal moves with the exact sensor size.
- What is a 50 mm lens equivalent to on a crop sensor?
- It frames like an 80.7 mm lens on Canon APS-C, 76.7 mm on Sony and Nikon APS-C, 100.0 mm on Micro Four Thirds and 136.4 mm on a 1-inch sensor. On the medium-format preset it frames like a 39.5 mm lens on full frame.
- Does a crop sensor make my lens longer?
- No. The focal length stays the same; the sensor records a smaller part of the image the lens projects, so the field of view narrows. For the same framing and the same depth of field on full frame, the f-number scales by the crop factor too: type the aperture and the tool shows it, so f/2.8 on Canon APS-C gives the depth of field of f/4.5 on full frame and f/1.4 on Micro Four Thirds that of f/2.8. Exposure does not change: the lens still passes the light of its own f-stop, so the shutter speed and ISO stay as metered.
- How is the field of view worked out?
- Angle = 2 × arctan(d ÷ (2 × f)), where d is the sensor width, height or diagonal and f the focal length, for a rectilinear lens. A 50 mm lens on full frame gives 39.60° across the 36 mm width. The result stays under 180°, so a 1 mm lens on full frame shows a diagonal of 174.71° rather than a capped value. Fisheye lenses project differently and are not modeled.
- What field of view does a 24 mm, 35 mm or 85 mm lens give on full frame?
- The horizontal angle is 73.74° at 24 mm, 54.43° at 35 mm and 23.91° at 85 mm. The vertical angles are 53.13°, 37.85° and 16.07°.
- How do I enter my own sensor size?
- Choose Custom and type the width and height in millimeters. A 24 × 16 mm sensor has a diagonal of 28.84 mm and a crop factor of 1.50, so a 50 mm lens frames like 75.0 mm on full frame. Each side must be from 1 to 100 mm.
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