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Field of View Calculator

Horizontal, vertical, and diagonal angle of view for a lens and sensor.

Focal length

Sensor width

Sensor height

How it works

Angle of view = 2 × arctan(d ÷ 2f), where d is the sensor dimension and f is the focal length. The formula assumes the lens is focused at infinity. Focusing closer narrows the real angle slightly, especially on macro lenses. Full frame is 36 × 24 mm and APS-C is about 23.5 × 15.6 mm. Example: A 50 mm lens on a 36 × 24 mm sensor covers 39.6° horizontally, 27° vertically, and 46.8° diagonally.

FAQ

Is this calculator free?

Yes. No signup is needed and nothing you enter is stored.

Is the result exact?

Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.

Do my numbers leave my device?

No. The calculation runs in your browser.