How to Use the Lens Field of View Calculator

1. Pick a sensor preset. Full frame, Super 35, APS-C (1.5x or 1.6x crop), Micro Four Thirds, or 1-inch — or select Custom and enter your own sensor dimensions.
2. Enter the focal length. The lens’s focal length in millimeters.
3. Set anamorphic squeeze (if applicable). Spherical lenses stay at 1.0x; anamorphic lenses use 1.3x, 1.5x, 1.8x, or 2.0x depending on the glass.
4. Read your results instantly. Horizontal, vertical, and diagonal field of view in degrees, plus the 35mm-equivalent focal length, update live as you type — no button to press.
5. (Optional) Enter a comma-separated list of focal lengths in the compare field to build a side-by-side table of every lens in your kit on the same sensor.

Tip: Editing sensor width or height directly automatically switches the preset to Custom, so you can start from a known format and fine-tune it without losing your place.

Understanding Field of View and Lens Equivalence

A lens’s field of view (FOV) is the angle of the scene it captures, and it depends on two things: the lens’s focal length and the physical size of the sensor recording the image. The same 35mm lens frames a much tighter shot on a crop-sensor camera than it does on full frame, because the smaller sensor only records the center portion of the image circle. The Lens Field of View Calculator computes the exact horizontal, vertical, and diagonal angle of view for any lens and sensor pairing, so you know precisely what you’re framing before you get on set.

The calculator also reports the 35mm-equivalent focal length — the lens you’d need on a full-frame sensor to get the same horizontal field of view. For example, a 35mm lens on an APS-C sensor (1.5x crop) has roughly the same horizontal FOV as a 53mm lens on full frame. This is the number most photographers mean when they talk about “crop factor,” and it’s essential for translating your lens instincts between camera systems.

For cinematographers working with anamorphic lenses, the squeeze factor matters just as much as the sensor size. An anamorphic lens optically compresses a wider field of view onto the sensor width, so a 2.0x squeeze lens captures a much wider horizontal angle than its focal length alone would suggest on a spherical lens. The calculator applies your chosen squeeze factor before computing the horizontal and diagonal field of view, so anamorphic shooters get an accurate number instead of a spherical approximation.

New in this version: the lens comparison table. Enter a comma-separated list of focal lengths — your whole prime kit, or the zoom range you’re considering — and the calculator builds a sorted table showing the field of view and 35mm equivalent for every lens at once, on the same sensor and squeeze settings. It’s a fast way to decide which focal length actually gets you the framing you want before you pack the bag.

This calculator is especially useful for:

• Photographers switching camera systems who need to translate familiar focal lengths to a new sensor size.
• Cinematographers planning anamorphic or spherical lens packages and matching FOV across formats.
• Location scouts and DPs pre-visualizing coverage before a shoot, without a lens in hand.
• Anyone buying a lens who wants to know exactly how wide or tight it will frame on their specific camera.

Field of view is purely a function of focal length, sensor dimensions, and squeeze — it doesn’t change with aperture, focus distance, or subject distance. Once you know your sensor’s physical dimensions (check your camera’s spec sheet if you’re not sure which preset applies), this calculator gives you a fast, accurate way to plan your shots and compare lenses before you’re ever on location.