# Specific Absorption Rate (SAR) Calculator

Specific Absorption Rate (SAR) is the unit of measurement for the amount of radio frequency energy absorbed by a body when using a wireless device. The SAR Calculator requires you to enter the Electric Field (V/m), Conductivity of the Material (S/m) and Mass Density (Kg/m3). It gives the SAR value in W/Kg and the power density.
• V/m
• S/m
• Kg/m3

### Result

• Specific Absorption Rate (W/kg)
• Incident Power Density
Click here to view image

Where,

σ = Conductivity of Material

E = Electric Field(RMS)

m= Mass Density

Example:

If Electric field(rms)= 4 V/m, conductivity of  material =150 S/m, mass density = 1250 Kg/m3

Then, Specific Absorption Rate = 1.92 W/kg and

Power Density = 0.042

What is SAR?

Specific Absorption Rate (SAR) is the unit of measurement for the amount of radio frequency energy absorbed by a body when using a wireless device. The SAR value is measured in terms of watts per kilogram (W/kg). The RF exposure limits used are expressed in the terms of SAR, which is a measure of the electric/magnetic field strength and power density for transmitters operating at frequencies from 300 kHz to 100 GHz. The FCC and federal governmental agencies around the world require that any wireless device be evaluated to meet the RF exposure limits set forth in the governmental SAR regulations. Click here to learn more about SAR.

## Get the RF Calculator App

Download the RF Calculator App on Android or iOS devices