How do I determine the DPI of an image?

Related questions

1. Is PPI and DPI same?
2. Can 72 dpi be high resolution?
3. Is 72 dpi considered high resolution?
4. What are DPI sensitivity levels?
5. Is 200 dpi Good for printing?
6. What DPI is best for gaming?
7. Can I increase dpi of an image?
8. Is 600 dpi good for scanning photos?

Tags

1. #enter
2. #pixels
3. #inches
4. #width
5. #displayed
6. #various
7. #select
8. #formula
9. #section
10. #output
11. #which
12. #calculator
13. #calculate
14. #physical
15. #pixel
16. #printed
17. #devices
18. #resolution
19. #image
20. #height