Working calculators for aperture, shutter speed, depth of field, print size, megapixels, and flash guide number.
Understanding the technical side of photography can dramatically improve your images. Our free photography calculators help you master exposure, depth of field, print sizing, and more — whether you're a beginner or professional.
The exposure triangle consists of three elements: aperture, shutter speed, and ISO. Our calculators help you understand the relationship between these settings. Aperture (measured in f-stops) controls depth of field and light intake — a lower f-stop (e.g., f/1.8) gives blurry backgrounds, while a higher f-stop (e.g., f/16) keeps everything in focus. Shutter speed controls motion blur and exposure time — faster speeds freeze action, slower speeds create motion blur.
Depth of field (DOF) is the distance between the nearest and farthest objects in sharp focus. It's affected by aperture, focal length, and distance to subject. Our DOF calculator helps you predict exactly how much of your image will be in focus before you take the shot — essential for portrait, macro, and landscape photography.
How large can you print your photo without losing quality? The answer depends on megapixels and DPI (dots per inch). For high-quality prints, you typically need 300 DPI. Use our print size calculator to determine maximum print dimensions from your camera's resolution, and our megapixel calculator to understand what different resolutions mean for your work.
The guide number (GN) of your flash tells you how powerful it is. Our flash guide number calculator helps you determine the correct aperture for a given distance, or the maximum flash distance for a given aperture — essential for studio and event photography.
All calculations happen locally in your browser — no images are uploaded, and your data never leaves your device. Bookmark this page for quick reference during photoshoots.