Photography
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Photography and cinema math: depth of field and hyperfocal distance from sensor format, crop factor and equivalent focal length, print dimensions from pixels and DPI, aspect ratio scaling, megapixels, exposure value, shutter angle, flash guide number, and horizontal field of view. Bench and homework estimates — lens charts and manufacturer specs may differ slightly.
10 tools in this section
Depth of Field
Calculate near focus, far focus, and total depth of field from focal length, aperture, distance, and sensor size. Free DOF calculator for photographers.
Hyperfocal Distance
Calculate hyperfocal distance from focal length, aperture, and sensor circle of confusion. Maximize sharp depth from near foreground to infinity.
Crop Factor
Find crop factor for common sensor sizes and convert lens focal length to full-frame equivalent. Handy when comparing lenses across camera bodies.
Print Size & DPI
Calculate maximum print size in inches and centimeters from pixel dimensions and target DPI. See whether your photo is large enough for wall prints.
Aspect Ratio
Scale image dimensions to fit a target width and height without cropping or distortion. Keeps the original aspect ratio for resize and layout planning.
Megapixel
Convert pixel width and height to megapixels, or solve dimensions from a target megapixel count and aspect ratio. Useful for camera and print planning.
Exposure Value (EV)
Calculate exposure value (EV) from aperture, shutter speed, and ISO using the standard APEX formula. Compare exposure settings across lighting setups.
Shutter Angle
Convert cinema shutter angle to shutter speed and back at any frame rate. Useful for matching motion blur between video cameras and film-style settings.
Flash Guide Number
Solve flash guide number, flash-to-subject distance, or required f-number with GN = distance × f-number. Free strobe exposure calculator for photographers.
Field of View
Calculate horizontal field of view in degrees from focal length and sensor width. Pick presets for full-frame, APS-C, Micro Four Thirds, and 1-inch sensors.