“How much can I crop”, I am often asked.

Depends on what you need – look at the remaining pixels after you crop.

Here’s how many pixels you need:

• A longest dimension of 3,000 pixels is enough for a good 8×10 print or a little larger.
• 1,200 pixels for a web site
• That, or perhaps 1,024 pixels, for an email attachment.

So as long as you crop to at least those kinds of sizes, you can crop all you like. This is one big reason for always shooting RAW, or large jPG,  of course: more pixels to play with.

And it is pixels you should worry about, not DPI. (Or DPI x Inches, but why express it in two numbers when one suffices?)