Flash energy to watt seconds calculator

Convert flash energy measurements to watt seconds (joules), useful for photography, lighting, and energy calculations

Input Parameters

Calculation Results

Calculation Formula

Watt Seconds (Ws) = Flash Energy (J) × Flash Duration (s)

Where:
Flash Energy: Energy output of the flash in joules
Flash Duration: Time duration of the flash in seconds
Watt Seconds: Energy equivalent in joules (Ws = J)

Result

Watt Seconds (Ws): 0.00
Luminous Efficacy Result (lm/W): 0.00
Total Energy Output (J): 0.00

Flash energy to watt seconds calculator Calculator Usage Guide

Learn how to use the Flash energy to watt seconds calculator and its working principles

How to use the calculator

  1. Enter the Flash Energy in Joules (J). This is the total energy output of your flash.
  2. Input the Flash Duration in seconds. This is how long the flash is active.
  3. Provide the Luminous Efficacy in lm/W if you want to calculate the luminous efficacy result.
  4. Click the "Calculate" button to compute the results.
  5. Use the "Reset" button to clear all inputs and start over.

Calculator Formula Explained

The calculator uses the following formula:

Watt Seconds (Ws) = Flash Energy (J) × Flash Duration (s)

Since 1 Joule = 1 Watt Second, this conversion is straightforward. The calculator also provides an additional luminous efficacy calculation that shows the luminous efficiency of the flash.

When to use this calculator

  • Photographers calculating flash power requirements
  • Electrical engineers working with energy storage systems
  • Researchers studying lighting efficiency
  • Anyone needing to convert flash energy measurements to standard energy units