Convert any lens between sensors: APS-C to full frame, Micro Four Thirds, 1 inch or medium format, with the equivalent focal length, aperture and angle of view.
APS-C, Micro Four Thirds, 1 inch, medium format and more, in your browser
Pick the sensor your lens sits on, type the focal length and the aperture, and the calculator shows what that lens frames like on full frame, its 35mm equivalent: the equivalent focal length in big type, the crop factor, the equivalent aperture and the angle of view. A 50 mm lens on Micro Four Thirds comes out as 100 mm on full frame, a 35 mm on Canon APS-C as 56 mm, a 24 mm on a 1 inch compact as 65 mm. Every value on the screen copies with a click, so the number you need goes straight into a note or a message.
The list covers the sensor formats people actually shoot: full frame, APS-C for Nikon, Sony and Fujifilm, Canon APS-C, APS-H, Micro Four Thirds, 1 inch and the smaller phone-size formats, digital medium format, Super 35 and 120 and sheet film. For a sensor that is not in it, choose Custom size and type the width and height in millimetres.
Full frame is the default target because that is how lenses are compared, but the Convert to list takes any format, so the tool also answers the questions that do not involve 35 mm at all. Set Micro Four Thirds to APS-C to find the Fujifilm lens that frames like your Olympus 25 mm, or swap the two sensors with the arrows button to go the other way: full frame to APS-C tells you which crop-sensor lens gives the view of the 85 mm you are used to.
The conversion is the ratio of the two sensor diagonals, which is how crop factor is defined. Crop factor is simply the full-frame diagonal (43.3 mm) divided by your sensor's diagonal, so the calculator uses the exact sensor size rather than a rounded number. That is why APS-C shows 1.53 and not the 1.5 printed in the brochure, and a 50 mm on it comes out as 77 mm rather than 75. To see those sensors side by side to scale, use the camera sensor size comparison. The crop factors of the common sensors:
| Sensor | Size (mm) | Crop factor | 50 mm frames like |
|---|---|---|---|
| Medium format 44 × 33 | 43.8 × 32.9 | 0.79 | 39 mm |
| Full frame | 36 × 24 | 1.00 | 50 mm |
| APS-H (Canon) | 27.9 × 18.6 | 1.29 | 65 mm |
| APS-C (Nikon, Sony, Fujifilm) | 23.5 × 15.6 | 1.53 | 77 mm |
| APS-C (Canon) | 22.3 × 14.9 | 1.61 | 81 mm |
| Micro Four Thirds | 17.3 × 13 | 2.00 | 100 mm |
| 1 inch | 13.2 × 8.8 | 2.73 | 136 mm |
| 1/2.3 inch | 6.17 × 4.55 | 5.64 | 282 mm |
The second number is the one lens charts leave out. A smaller sensor needs a shorter lens for the same view, and a shorter lens at the same f-number gives more depth of field, so an f/1.8 lens on Micro Four Thirds blurs the background like f/3.6 on full frame. The calculator multiplies the aperture by the same factor as the focal length and labels it for depth of field, because that is what it describes. The exposure does not change: f/1.8 lets in the same light per square millimetre on any sensor, so shutter speed and ISO stay the same at the same f-number.
The angle of view is worked out from the focal length and the real sensor size: the diagonal angle in the card, with the horizontal and vertical angles under it. A 50 mm lens on full frame covers 46.8 degrees across the diagonal and 39.6 by 27 degrees across and up. The drawing under the numbers shows the lens on both sensors at once, your sensor filled and the other dashed, so you can see how much narrower the view gets on the smaller one.
Diagonals match exactly, but a 4:3 sensor such as Micro Four Thirds is a different shape from 3:2 full frame, so the horizontal angles of two equivalent lenses differ by a few percent. The horizontal and vertical figures are there for when that matters, for a panorama or a video frame.
The calculator is a page of arithmetic that runs in your browser. Nothing you type, not your camera, your lens or your custom sensor size, is sent anywhere, and it keeps working offline once the page has loaded.
On Nikon, Sony and Fujifilm APS-C a 50 mm lens frames like about 77 mm on full frame, since their crop factor is 1.53. On Canon APS-C, which is slightly smaller, it is about 81 mm with a crop factor of 1.61. The lens itself does not change: the smaller sensor records only the middle of the picture it projects.
The crop factor formula is the diagonal of a full-frame sensor, 43.27 mm, divided by the diagonal of your sensor. The diagonal is the square root of width squared plus height squared, so a 23.5 by 15.6 mm APS-C sensor has a 28.2 mm diagonal and a crop factor of 1.53. That is also why it is called the focal length multiplier: multiply a focal length by it to get the full-frame equivalent, and the calculation is done.
It does not change exposure. An f/2 lens gives the same brightness on every sensor. It does change depth of field for the same framing, which is what the equivalent aperture shows: f/2 on Micro Four Thirds gives roughly the depth of field of f/4 on full frame.
Micro Four Thirds is 2.0, so every focal length doubles. A 1 inch sensor is 2.7, so the 8.8 to 36 mm zoom on many compacts frames like about 24 to 100 mm on full frame. Phone sensors are much smaller still, which is why their very short lenses are quoted as 24 or 26 mm equivalents.
Yes. Set Your camera sensor to one format and Convert to to the other, for example Micro Four Thirds to APS-C, and the result is the lens that gives the same view on the second camera. The arrows button swaps them.
No. All of the maths runs in your browser and nothing is uploaded or stored.