Select a category and enter your values below
To convert from Watt-second (Ws) to Gigajoule (GJ), use the following formula:
Gigajoule (GJ)
= 1109× Watt-second (Ws)
= 10-9× Watt-second (Ws)
Let's convert 5 Watt-second (Ws) to Gigajoule (GJ).
Using the formula:
5 × 10-9 = 5× 10-9
Therefore, 5 Watt-second (Ws) is equal to 5× 10-9 Gigajoule (GJ).
How many watt-seconds are in one gigajoule? One Gigajoule (GJ) contains 109 Watt-seconds (Ws) — the inverse of the factor above. Multiplying by 10-9 takes you from watt-seconds to gigajoules; multiplying by 109 brings you back.
Put in words: one watt-second equals 10-9 gigajoules, so the watt-second is the smaller unit of this pair. Converting between them never changes the amount of energy being measured — only the size of the unit you count it in.
A Watt-second (Ws) is a unit of energy in the International System of Units (SI), equal to exactly one Joule (J).
It is a fundamental measurement used to quantify energy transfer, especially in fields like physics and photography.
The relationship is simple: one Watt-second is precisely equal to one Joule.
This 1:1 equivalence means the two units are entirely interchangeable. So, if you have 100 Ws of energy, you also have 100 J of energy.
This makes it a straightforward and reliable unit for any precise energy calculation.
In photography, the Watt-second is the standard for measuring the maximum energy output of a studio strobe or electronic camera flash.
Essentially, a higher Watt-second rating means a more powerful flash.
For example, a 500 Ws strobe has more flash power than a 200 Ws unit, allowing it to produce a much brighter burst of light.
This extra power is crucial for illuminating larger scenes or overpowering ambient light, like bright sunshine.
The name "Watt-second" perfectly describes its own formula.
It is the amount of energy used when one Watt of power is applied for exactly one second.
This gives us the fundamental equation for energy transfer:
Energy (Ws) = Power (W) × Time (s)
To sum up, while the Watt-second is a universal unit of energy equivalent to a Joule, its most common practical use is in photography.
When choosing a studio strobe or camera flash, a higher Ws rating gives you more lighting power, offering greater creative control over your shots.
Ever looked at your energy bill and wondered what a Gigajoule (GJ) is?
It's a standard unit used to measure energy, just like a kilowatt-hour is for electricity or a gallon is for gasoline.
Specifically, a Gigajoule (GJ) is a metric unit of energy in the International System of Units (SI).
One gigajoule is equal to one billion Joules (109 J).
A single gigajoule contains a significant amount of energy. To put it into perspective, one GJ is roughly equivalent to:
This makes it an efficient unit for measuring large-scale energy consumption, such as heating your home or powering industrial processes.
You'll most commonly encounter the gigajoule in a few key areas:
Understanding how the gigajoule compares to other units helps compare the costs and efficiencies of different energy sources.
Here are some key gigajoule conversions:
Here are some quick reference conversions from Watt-second (Ws) to Gigajoule (GJ):
| Watt-seconds | Gigajoules |
|---|---|
| 0.000001 Ws | 10-15 GJ |
| 0.001 Ws | 10-12 GJ |
| 0.1 Ws | 10-10 GJ |
| 1 Ws | 10-9 GJ |
| 2 Ws | 2× 10-9 GJ |
| 3 Ws | 3× 10-9 GJ |
| 4 Ws | 4× 10-9 GJ |
| 5 Ws | 5× 10-9 GJ |
| 6 Ws | 6× 10-9 GJ |
| 7 Ws | 7× 10-9 GJ |
| 8 Ws | 8× 10-9 GJ |
| 9 Ws | 9× 10-9 GJ |
| 10 Ws | 10-8 GJ |
| 20 Ws | 2× 10-8 GJ |
| 30 Ws | 3× 10-8 GJ |
| 40 Ws | 4× 10-8 GJ |
| 50 Ws | 5× 10-8 GJ |
| 100 Ws | 10-7 GJ |
| 1000 Ws | 10-6 GJ |
| 10000 Ws | 10-5 GJ |
For all Energy converters, choose units using the From/To dropdowns above.