How to use the magnifying glass power calculator
Find the angular magnification and lens power of a simple magnifier. Enter focal length in the field above; the angular magnification, lens power are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “magnifying glass power”, “loupe magnification”, “magnifier focal length”, “calculate magnifying glass power”, “find angular magnification”.
Formula
Variables
- f — Focal length (cm)
Worked example
With focal length = 5 cm, the calculator gives angular magnification ≈ 5 ×; lens power ≈ 20 D.
Frequently asked questions
What is the magnifying glass power calculator used for?
Find the angular magnification and lens power of a simple magnifier. It helps with questions such as “magnifying glass power”, “loupe magnification”, “magnifier focal length”.
What is the formula for the magnifying glass power calculation?
Angular magnification (×) = 25 / f. Lens power (D) = 100 / f. Here f is focal length (cm).
What inputs do I need for the magnifying glass power calculator?
You need focal length in cm. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the magnifying glass power calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the magnifying glass power result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.