About the Lens Equation Calculator
A free tool for solving the thin lens equation and interpreting the resulting image.
What it is
This calculator solves 1/f = 1/dโ + 1/dแตข for focal length, object distance, or image distance โ whichever you leave blank โ and also reports magnification, whether the image is real or virtual, and whether it's upright or inverted.
Features
Solve for any variable
Leave f, dโ, or dแตข blank and the calculator finds it.
Magnification
See the image size ratio and orientation.
Image type
Real or virtual, upright or inverted, determined automatically.
Instant, private
Runs entirely in your browser. No data is sent anywhere.