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Calcimator

Lens Equivalent Calculator

Convert focal lengths between camera sensor sizes. Find the equivalent field of view and crop factor when switching between camera systems.

Inputs

mm

Results

Equivalent Focal Length

25 mm

Conversion Factor

2

Full-Frame Equivalent50 mm
Source Crop Factor1
Target Crop Factor2
Field of View (source)46.8°
Field of View (target)46.8°
Lens Category (FF equiv)Normal / Standard

Equivalent Focal Length

25 mm

Conversion Factor

2

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Focal Length — The focal length of the lens you want to convert. Accepts values from 1 mm to 2,000 mm (default: 50 mm).
  3. Source Sensor (lens is on) — The sensor size of the camera the lens is currently on. Choose from: Full Frame (36x24mm), APS-C Canon (22.3x14.9mm), APS-C Nikon/Sony (23.5x15.6mm), Micro Four Thirds (17.3x13mm), 1-inch (13.2x8.8mm), 1/2.3-inch (6.17x4.55mm), Medium Format (44x33mm). default: 1.
  4. Target Sensor (convert to) — The sensor size you want to find the equivalent focal length for. Choose from: Full Frame (36x24mm), APS-C Canon (22.3x14.9mm), APS-C Nikon/Sony (23.5x15.6mm), Micro Four Thirds (17.3x13mm), 1-inch (13.2x8.8mm), 1/2.3-inch (6.17x4.55mm), Medium Format (44x33mm). default: 4.
  5. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  6. Equivalent Focal Length — shown as a numeric value. This is the primary result of this calculator.
  7. Conversion Factor — shown as a numeric value. This is the primary result of this calculator.
  8. Full-Frame Equivalent — shown as a numeric value.
  9. Source Crop Factor — shown as a numeric value.
  10. Target Crop Factor — shown as a numeric value.
  11. Field of View (source) — shown as a numeric value.
  12. Field of View (target) — shown as a numeric value.
  13. Lens Category (FF equiv) — your calculated result.
  14. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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