Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Horizontal angle of view (°)
54.4
Vertical angle of view (°)
37.8
Diagonal angle of view (°)
63.4
Scene width in frame (ft)
15.43
Scene height in frame (ft)
10.29
Full-frame equivalent focal length (mm)
35.0
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter focal length (mm).
- 2Enter sensor format.
- 3Enter distance to subject (ft).
- 4Read your horizontal angle of view (°) on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Useful for scouting a shot before you carry the lens: enter focal length, sensor size, and distance to see the horizontal and vertical angle of view plus exactly how wide a scene fits in frame.
Worked example
Using the values the calculator loads with:
Inputs
- Focal length: 35 mm
- Sensor format: Full frame 36×24
- Distance to subject: 15 ft
Results
- Horizontal angle of view (°): 54.4
- Vertical angle of view (°): 37.8
- Diagonal angle of view (°): 63.4
- Scene width in frame (ft): 15.43
- Scene height in frame (ft): 10.29
- Full-frame equivalent focal length (mm): 35
What each field means
Inputs
- Focal length (mm)
- The focal length used in the calculation, measured in mm. Starts at 35 mm so you have a working example on load.
- Sensor format
- Pick the option that matches your situation — the maths changes per option. Choices: Full frame 36×24, APS-C 23.5×15.6, Micro Four Thirds 17.3×13, Super 35 24.9×14, Medium format 44×33.
- Distance to subject (ft)
- The distance to subject used in the calculation, measured in ft. Starts at 15 ft so you have a working example on load.
Results
- Horizontal angle of view (°)
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Vertical angle of view (°)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Diagonal angle of view (°)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Scene width in frame (ft)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Scene height in frame (ft)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Full-frame equivalent focal length (mm)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What is a 'normal' lens?
One whose focal length roughly matches the sensor diagonal — about 43 mm on full frame, 28 mm on APS-C, 21 mm on Micro Four Thirds. That is where perspective looks closest to unaided vision.
Does crop factor change perspective?
No. Perspective is set by where you stand. Cropping changes framing only — but since you usually step back to reframe, the resulting images do look different.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Field of View Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/field-of-view
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/field-of-view" target="_blank" rel="noopener">Field of View Calculator — RevenueLab</a> (2026).</p>
Source: [Field of View Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/field-of-view) (2026).