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Free Space Radio Path Loss Calculator

Use this online free space radio path loss calculator with pasted values. Far-field line-of-sight free space; ignores obstacles, reflection, atmosphere and antenna gains.

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  1. 01

    Add your input

    Choose a tool, enter values or select a file.

  2. 02

    Make it yours

    Adjust the options and run the action.

  3. 03

    Take the result

    Copy the result or download its file.

fspl calculator online online

Use free space radio path loss calculator online to work with your own network values. Far-field line-of-sight free space; ignores obstacles, reflection, atmosphere and antenna gains.

How to use it

Enter Path distance (km). Set Radio frequency (MHz). Select Calculate, check the result units, then copy or download the JSON result.

Options and example settings

OptionChoices / valueExample default
Path distance (km)Main input. Decimal or scientific notation. Positive values only. 1
Radio frequency (MHz)Option. Decimal or scientific notation. Positive values only. 2400

Calculation method

FSPL = 20 log₁₀(4πdf/c)

Worked examples

Worked case for free space radio path loss calculator. Far-field line-of-sight free space; ignores obstacles, reflection, atmosphere and antenna gains.

Free Space Radio Path Loss Calculator — example with explicit inputs

Settings: Radio frequency (MHz): 2400

Input:

1

Expected result for the example input and options:

Output:

{
  "free_space_loss_dB": 100.0520080561155
}

Limitations and common mistakes

  • Far-field line-of-sight free space; ignores obstacles, reflection, atmosphere and antenna gains.
  • Match every input to its displayed unit; scientific notation such as 1e-6 is accepted.

Frequently asked questions

How can I use fspl calculator online online?

Enter Path distance (km). Set Radio frequency (MHz). Select Calculate, check the result units, then copy or download the JSON result.

Which model does Free Space Radio Path Loss Calculator use?

FSPL = 20 log₁₀(4πdf/c). Far-field line-of-sight free space; ignores obstacles, reflection, atmosphere and antenna gains.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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