Lens Field of View Calculator
Horizontal, vertical and diagonal angles plus scene width at any distance — what the lens actually sees, for any focal length and sensor.
Spec sheets quote the flattering diagonal angle; composition happens in the horizontal. The scene-width output is the working number for jobs: interview framing, surveillance coverage, product-table coverage, group-photo math — multiply your way to the lens before the shoot.
Formula
⚠️ Optical estimates based on standard formulas and circle-of-confusion conventions — lens markings, sensor specs and real-world testing have the final word.
Horizontal, vertical and diagonal angles plus scene width at any distance — what the lens actually sees, for any focal length and sensor.
About Lens Field of View Calculator
A '84° lens' sounds precise until you ask: 84° measured across what? Manufacturers quote the diagonal (the biggest number); cinematographers think horizontal; drone and security planners need metres-of-scene-covered at a working distance. This calculator computes all three angles from focal length and sensor geometry, then converts to the practical question — how wide and tall is my frame at X metres — that decides lens choice for interviews, real-estate rooms, group portraits and camera placement.
How to use Lens Field of View Calculator
- 1Enter — sensible defaults are pre-filled so you see a worked result immediately.
- 2Read the live results: .
- 3Check the "With your numbers" line to see the formula FoV = 2 × atan(sensor dimension / 2f); scene width = 2 × distance × tan(FoV/2) — thin-lens, distant focus substituted step by step.
- 4Adjust inputs (or flip the unit toggle) until the scenario matches yours, then copy or share the result.
Why use Lens Field of View Calculator?
- ✓Instant, free and private — every calculation runs in your browser, nothing is uploaded
- ✓Built on the published formula FoV = 2 × atan(sensor dimension / 2f); scene width = 2 × distance × tan(FoV/2) — thin-lens, distant focus with sources cited on the page
- ✓Spec sheets quote the flattering diagonal angle; composition happens in the horizontal. The scene-width output is the working number for jobs: interview framing, surveillance coverage, product-table coverage, group-photo math — multiply your way to the lens before the shoot.
- ✓Switch units, tweak any input and watch every result update live
Frequently asked questions
Why does my zoom seem to see less when I focus close?+
Focus breathing: the thin-lens FoV formula assumes focus near infinity, and many internal-focus designs shorten effective focal length as they focus closer — some 70-200s famously frame like ~135mm at minimum distance. Video shooters pay for breathing-corrected cine lenses precisely to kill this. For close-range planning (products, macro, interviews under 2 m), test the actual lens; for landscape-to-mid distances this calculator's angles hold within a degree or two.
What focal lengths give what angles — the reference ladder?+
Full-frame horizontals worth memorizing: 14mm → 104°, 24mm → 74°, 35mm → 54°, 50mm → 40°, 85mm → 24°, 135mm → 15°, 200mm → 10°, 400mm → 5°. Halving the angle requires doubling the focal length (the atan flattens out fast past 50mm — that's why tele lenses feel linear: at small angles FoV ≈ sensor/f in radians). Crop sensors slide the whole ladder by their factor.
How do I pick a lens to cover a known scene width?+
Invert the formula: required focal length ≈ sensor width × distance ÷ scene width (small-angle form, fine beyond ~30°... narrower). Example: cover a 4-m interview backdrop from 3 m on full frame → 36 × 3 ÷ 4 = 27mm; the exact atan math this page runs says 26mm. Same arithmetic sizes security-camera coverage, fixes the group-photo lens before the wedding, and explains drone-shot ground footprint (our mapping tools run that variant with overlap).
Do action cameras and phones really have 'wider' lenses?+
They have shorter REAL focal lengths matched to tiny sensors: a GoPro's ~3mm lens on a 1/1.9-inch-class sensor yields a 120°+ diagonal — equivalent to ~16mm full-frame but with enormous DoF for free (crop factor squared works in its favor: everything from 30 cm to infinity is sharp at f/2.8). The cost is the same equivalence arithmetic running backward — tiny total light capture, hence the night-mode computational tricks. FoV math is sensor-agnostic; light-gathering never is.
Related Field tools
Sunrise & Sunset Calculator
Exact rise, set, solar noon and day length for any place and date — the NOAA solar equations with the refraction fine print included.
● LiveGolden Hour & Blue Hour Calculator
Tonight's golden hour and blue hour, computed from sun elevation — the photographer's light windows with the angles that define them.
● LiveDay Length Calculator
Hours of daylight for any date and latitude, how fast it's changing, and the swing between your solstices.
● Live