Calculate depth of field
For a given lens, enter the focal length, aperture, the distance to your subject, and the camera’s sensor size. The length of the depth of field is displayed below the fields and updates as you change the values.

Feel free to give each lens a meaningful name to keep track of them.

The depth of field calculation can be expanded to view more related statistics:

Comparing lenses
Click on the "Add Lens" box to add an additional lens, then enter the second lens’ characteristics.

If the lenses are similar (i.e. same focal length) you may save time by using the Copy button to carry over the same values to the second lens.
You can add an unlimited number of lenses.

You can also see how lenses compare at various distances from the subject. The graph will display the length of the depth of field at 5-foot intervals until the length surpasses 200 feet.