Photo & Video Calculators
Calculate TV size, aspect ratio, PPI, depth of field, exposure, focal length, and file size estimates — free, in your browser, no account required.
Page verified • Last updated: August 2026
NumCalcX has 9 photography, video, and display calculators for the math behind cameras and screens — from how far to sit from a new TV to how much storage a video shoot will need. Every calculator below runs entirely client-side: nothing you type is sent to a server, and there's nothing to sign up for. Click any calculator to jump straight in.
Camera & Optics
Depth of Field Calculator
Calculate the near and far limits of acceptable sharpness from aperture, focal length, and focus distance.
→Exposure Calculator
Calculate Exposure Value (EV) from ISO, aperture, and shutter speed, and find equivalent exposure settings.
→Focal Length Calculator
Convert a lens's focal length to its full-frame equivalent using your camera's sensor crop factor.
→Screen & Display
TV Size Calculator
Find the recommended TV screen size from your viewing distance.
→Aspect Ratio Calculator
Simplify a resolution or dimension pair into its aspect ratio, or scale one dimension to match a target ratio.
→PPI Calculator
Calculate pixel density (PPI) from a screen's resolution and diagonal size.
→Screen Size Calculator
Calculate a screen's width and height in inches or cm from its diagonal size and aspect ratio.
→File Size
Image File Size Calculator
Estimate an image file's size from resolution, bit depth, and an estimated compression ratio.
→Video File Size Calculator
Estimate a video file's size from bitrate and duration.
→Frequently Asked Questions
Are these photo and video calculators free to use?
Yes. Every calculator on NumCalcX runs entirely in your browser — no sign-up, no account, and no data sent to a server.
Which calculator tells me what size TV to buy?
Use the TV Size Calculator — enter your viewing distance and it recommends a diagonal screen size range.
What is EV in the Exposure Calculator?
Exposure Value (EV) is a single number combining aperture, shutter speed, and ISO into one measure of how much light reaches the sensor — useful for comparing equivalent exposure settings.