Skip to content

PhysRefPhysics reference

Home Formulas Search Constants Tools Guides Sheets Practice Saved Premium

Lens Power

P = \frac{1}{f}

P = 1/f

The power of a lens in diopters is the reciprocal of focal length in meters.

Variables

P

Power

D (diopters)

f

Focal length

m

Your notes

0/5000

Calculator

Solves for P - Power (D (diopters))

fm

Enter f to calculate P.

Related formulas

\frac{1}{f}Thin Lens EquationLenses P_{total}Combined Lens PowerLenses

Tags

lens power diopters optics

PhysRef

A physics formula reference that works offline-first: your saved formulas and notes stay in this browser and are never uploaded.

Reference

Formulas Constants Unit converter Formula sheets

Learn

Study guides Search Saved Restore access

Site

Privacy Terms Support

© 2026 PhysRef. Values follow CODATA and SI; always check against your own course notation.More study tools: CalcRef · ChemTable · Octet · Trigonify · EngiRef · StatRise · OpticBench