EMC Conversion Tables (dBm, dBµV, dBµV/m, dB ratio)

These tables collect the values worth looking up at a glance on the test floor. For anything between the rows, use the calculator linked from each page.

dBm ↔ W

dBm ↔ W Conversion Table (Power Reference)

Reference table of mW and W values from −40 dBm to +60 dBm in 5 dB steps, with the values worth memorizing and the mistakes people make.

dBµV/m ↔ V/m

dBµV/m ↔ V/m Field Strength Conversion Table

Reference table of µV/m, mV/m and V/m from 0 to 140 dBµV/m in 10 dB steps.

dB ↔ ratio

dB ↔ Ratio Conversion Table (Power and Voltage)

Power ratio and voltage ratio side by side from 0 dB to 120 dB, so shielding effectiveness and attenuation can be read directly as a factor.

dBµV ↔ V

dBµV ↔ V Voltage Conversion Table (with 50 Ω dBm)

Reference table of µV, mV, V and the equivalent 50 Ω dBm value from 0 to 140 dBµV.

Cheat sheet

EMC Cheat Sheet (one printable page)

A one-page printable EMC cheat sheet with dB conversions, anchor values, the formulas used most often and measurement bandwidths. Print it and put it on the lab wall.

Table values are generated with the same formulas as the calculators on this site, so they always agree. Only the number of displayed digits may differ because of rounding.

Related calculators

Results and summaries are for reference. For certification and test reports use the latest official standard text and calibrated instrument data. Last updated: 2026-10-10