Angle of View Calculator
Enter a lens focal length, measured sensor width and height, and subject distance. The calculator uses rectilinear thin-lens geometry and shows the covered scene size.
A QUICK WALKTHROUGH
How to use this tool
- Enter focal length, sensor width and height, and subject distance in millimetres or metres.
- Review horizontal, vertical, and diagonal angles and the scene width, height, and diagonal at that distance.
- Check the assumptions before using the estimate for a real camera setup.
Use measured sensor dimensions
Choose a known sensor format only when you have a reliable source, or enter the measured active width and height yourself. This tool intentionally does not guess a brand or camera sensor table.
Geometry and limits
Angles use 2·atan(sensor dimension ÷ (2·focal length)); scene coverage uses 2·distance·tan(angle ÷ 2). Focal length, sensor dimensions, and distance must be positive and within practical input limits. The estimate assumes a rectilinear lens, a centered subject, and a flat plane perpendicular to the optical axis.
Approximation
Actual lenses can differ because of distortion, focus breathing, crop modes, stabilization, and the manufacturer’s stated focal length. Use this result as a planning estimate, not a calibration certificate.
GOOD TO KNOW
Common questions
Can I enter a camera brand or model?
No. Enter the active sensor width and height from a trustworthy specification or your own measurement; no unverified sensor table is assumed.
What does subject distance mean?
It is the distance from the lens’s effective projection point to the flat subject plane. The simple model does not account for near focusing geometry.
Why is my real framing different?
Lens distortion, focus breathing, crop settings, and imprecise sensor or distance values can change the measured result.