---
title: "Photon Flux calculator — AperiOptic"
description: "Photons per second from optical power. Free online optics calculator, with the formula and code snippets."
url: "https://aperioptic.com/calculators/photon-flux"
---

# Photon Flux calculator

Photons per second from optical power.

Category: [Photonics](https://aperioptic.com/calculators)

Formula: `Φ = P·λ / (h·c)`

## Inputs

| Input | Parameter | Unit | Default |
| --- | --- | --- | --- |
| Power | `P` | mW | 1 |
| λ | `lam` | nm | 633 |

## Result with the default inputs

- Flux: 3.1866e+15 ph/s

Open it with your own values: put each input in the address as a parameter, for example [`/calculators/photon-flux?P=1`](https://aperioptic.com/calculators/photon-flux?P=1). A unit other than the listed one goes in `<parameter>_unit`.

Read more: [Wikipedia: Photon](https://en.wikipedia.org/wiki/Photon)

[All optics calculators](https://aperioptic.com/calculators)

---

The interactive page: https://aperioptic.com/calculators/photon-flux (AperiOptic runs in the browser; free, no account). Every page of the site as Markdown: https://aperioptic.com/llms.txt