Online EMF ICNIRP 1998 based on Ofcom calculator

Calculation of the safe separation distance as per ICNIRP1998 reference levels for general public exposure to EMF from 100 kHz to 300 GHz

The version of the EMF Calculator provided is based on the same logic and numbers from the trial version of the Ofcom EMF Calculator, with many thanks to them. Please see the notes there. This is not for commercial use. You can contact me at web at 2e0ugs.co.uk.

I take no responsibility for any loss, disruption or damage to your data or your computer system which may occur whilst using the Model or material derived from the Model. I do not warrant that the functions contained in the Model will be uninterrupted or error free, or that defects will be corrected, or that the Model provided is free of viruses. In no event will I be liable for any loss or damage including, without limitation, indirect or consequential loss or damage, or any loss or damages whatsoever arising from use or loss of use of, data or profits arising out of or in connection with the use or otherwise of the provided Model. By using this Model, you agree to the above.

Input parameters

Transmitter power EIRP

watts

Enter EIRP (Watts) in the field. EIRP(Watts) = ERP (Watts) x 1.64

Operating frequency

MHz

Enter frequency (MHz) in the field. Valid frequency from 0.1 MHz to 300,000 MHz.

Reference levels from ICNIRP 1998 Guidelines

Frequency range Index

E-field strength limit

- V/m

H-field strength limit

- A/m

Power density limit

- W/m^2

Intermediate parameters used in calculation. For information only.

Calculated result

Separation distance R

- m

- ft

Reference levels for general public exposure to time-varying electric and magnetic fields

Table 7. from The ICNIRP 1998 Guidelines available at https://www.icnirp.org/cms/upload/publications/ICNIRPemfgdl.pdf
Frequency range index	Min frequency MHz	Max frequency MHz	E-field strength V/m	H-field strength A/m	Power density W/m^2
0	0.1	0.15	87.000	5.000	-
1	0.15	1	87.000	-	-
2	1	10	-	-	-
3	10	400	28.000	0.073	2.000
4	400	2000	-	-	-
5	2000	300000	61.000	0.160	10.000

Instructions for use:

Enter the transmitter power EIRP* (Watts) of your equipment
Enter the operating frequency of your equipment (MHz)
The result of the calculation will be given.

This is an estimate of the safe separation distance in metres (compliance distance) to maintain between the radio equipment in question and members of the public.

*In most cases it would be appropriate for licensees (or licence applicants) to enter the maximum EIRP of the radio equipment in the transmitter power field. However, licensees may also choose to enter an average power (e.g. over the six-minute averaging period specified in the ICNIRP Guidelines) which takes account of the duty cycle (or factor) of the equipment and/or the maximum percentage of time that a transmitter will be operating during the averaging period. This can be done by multiplying the maximum transmit power of the equipment by the duty factor of the equipment and then by the maximum percentage of time that the equipment will be operating within the averaging period. For example, taking a transmitter with a maximum EIRP of 100 Watts, a duty factor of 50%, and a maximum percentage of time transmitting of 50%, we can calculate an average power of 25 Watts (100 Watts x 50% x 50% = 25 Watts average power).