Optics Calculator

• Free online optics calculator supporting lens formula, magnification, Snell's law, critical angle, lens power and combined focal length — six optical calculations
• Each type shows its formula clearly and lets you choose the unknown to solve for (e.g. focal length / object distance / image distance in the lens formula)
• Load sample data with one click; results are annotated with imaging nature (real/virtual image, enlarged/reduced), and the critical angle view includes a common materials refractive-index reference
• All calculations run locally in your browser — nothing is uploaded

1. Open the tool page — no download or installation needed
2. Choose a calculation type at the top (lens / magnification / refraction / critical angle / power / combined focal length), or click "Load example" to try it instantly
3. Fill in the required values; for the lens formula and Snell's law, first select the unknown to solve for. Values must not be zero
4. Click "Calculate" to view the result, review it and copy it with one click if needed

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — nothing is uploaded
• For the lens formula, power and combined focal length, input values must not be zero or a division-by-zero error appears; the critical angle exists only when the refractive index n₁ > n₂, and Snell's law reports total internal reflection when the refraction angle has no real solution

Free online optics calculator supporting lens formula, magnification, Snell's law, critical angle, lens power and other optical parameter calculations. Ideal for physics study, optical design and engineering applications.

Open the tool page — no download or installation needed Choose a calculation type at the top (lens / magnification / refraction / critical angle / power / combined focal length), or click "Load example" to try it instantly Fill in the required values; for the lens formula and Snell's law, first select the unknown to solve for. Values must not be zero Click "Calculate" to view the result, review it and copy it with one click if needed

This tool is completely free and requires no sign-up Everything runs locally in your browser — nothing is uploaded For the lens formula, power and combined focal length, input values must not be zero or a division-by-zero error appears; the critical angle exists only when the refractive index n₁ > n₂, and Snell's law reports total internal reflection when the refraction angle has no real solution

Yes, Optics Calculator is completely free. No download or installation required — it runs right in your browser.