What is a femtowatt (fW)?

A femtowatt is an SI derived unit of power equal to 10⁻¹⁵ watt, used to quantify very small rates of energy transfer, particularly in sensitive and nanoscale systems.

Is 1 femtowatt equal to 1 femtojoule per second?

Yes, 1 femtowatt [fW] is equivalent to 1 femtojoule per second [fJ/s] as both represent the same power magnitude.

In which fields is converting femtowatt to femtojoule per second useful?

This conversion is useful in nanoelectronics, quantum computing, single-photon detection, radio astronomy, and precision experimental physics where ultra-low power measurements are critical.

Convert Femtowatt [fW] to Femtojoule/second [fJ/s] - Online Power Converter

Use our online converter to easily transform femtowatt (fW) units into femtojoule per second (fJ/s), essential for nanoscale and ultra-sensitive power measurements.

Femtowatt [fW]

Femtojoule/second [fJ/s]

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Femtowatt [fW] to Femtojoule/second [fJ/s] Conversion Table

Femtowatt [fW]	Femtojoule/second [fJ/s]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Femtowatt [fW] to Femtojoule/second [fJ/s] Conversion Table
Femtowatt [fW]	Femtojoule/second [fJ/s]

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What Is This Tool?

This unit converter changes values from femtowatt (fW) to femtojoule per second (fJ/s), both units measuring extremely small power levels, frequently used in advanced scientific and technological applications.

How to Use This Tool?

Enter the power value in femtowatt (fW) you wish to convert
Select femtowatt as the input unit and femtojoule per second as the output unit
Click the convert button to get the equivalent power value in femtojoule per second (fJ/s)

Key Features

Converts femtowatt (fW) directly to femtojoule per second (fJ/s) with a one-to-one conversion rate
Supports measurements applicable in nanoelectronics, quantum physics, and radio astronomy
Browser-based and user-friendly design for quick and accurate conversions

Examples

5 femtowatt [fW] converts to 5 femtojoule/second [fJ/s]
0.1 femtowatt [fW] converts to 0.1 femtojoule/second [fJ/s]

Common Use Cases

Measuring received signal power and noise floors in radio astronomy and microwave receivers
Quantifying output or background power levels in ultra-sensitive photodetectors and single-photon counters
Estimating energy dissipation in ultra-low-power nanoelectronic devices and molecular-scale systems
Reporting tiny heat loads and background power in precision quantum experiments

Tips & Best Practices

Ensure input values are within the sensitive measurement range for accurate use
Use this conversion to compare power expressed as energy transfer per unit time in nanoscale contexts
Be aware of instrument limitations when working with extremely low magnitude power units

Limitations

Measurement accuracy may be affected by instrument sensitivity and noise at these extremely low power levels
The conversion assumes ideal conditions and full applicability of joule and watt definitions at nanoscale energy rates

Frequently Asked Questions

What is a femtowatt (fW)?: A femtowatt is an SI derived unit of power equal to 10⁻¹⁵ watt, used to quantify very small rates of energy transfer, particularly in sensitive and nanoscale systems.
Is 1 femtowatt equal to 1 femtojoule per second?: Yes, 1 femtowatt [fW] is equivalent to 1 femtojoule per second [fJ/s] as both represent the same power magnitude.
In which fields is converting femtowatt to femtojoule per second useful?: This conversion is useful in nanoelectronics, quantum computing, single-photon detection, radio astronomy, and precision experimental physics where ultra-low power measurements are critical.

Key Terminology

Femtowatt [fW]: An SI derived unit of power equal to 10⁻¹⁵ watts, used to measure extremely small power levels.
Femtojoule/second [fJ/s]: A unit of power equal to 10⁻¹⁵ joule per second, representing the rate of energy transfer at extremely small scales.

Quick Knowledge Check

What does a femtowatt measure?

Rate of energy transfer

Power at extremely small scales

Voltage levels

What is the conversion rate between femtowatt and femtojoule per second?

1 fW = 10 fJ/s

1 fW = 1 fJ/s

1 fW = 0.1 fJ/s

Which field commonly uses femtowatt measurements?

Radio astronomy

Marine biology

Geology

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