The Focal Length Calculator is an easy-to-use physics tool that calculates the focal length of a lens using the Lens Maker’s Formula 1f=(n−1)(1R1−1R2)\frac{1}{f} = (n – 1)\left(\frac{1}{R₁} – \frac{1}{R₂}\right)f1​=(n−1)(R1​1​−R2​1​). Here, fff is the focal length, nnn is the refractive index of the lens material, and R1R₁R1​ and R2R₂R2​ are the radii of curvature of the two surfaces of the lens. By entering these values, the calculator quickly determines the focal length, making it ideal for optical experiments and lens design. This tool is perfect for students, teachers, and physics enthusiasts studying lenses and image formation.