Signal levels and decibels
Convert RMS/peak levels, dBV, dBu, dBm and voltage ratios using an explicit waveform and load.
Development preview. Check the assumptions below before relying on a result. Calculations run in your browser.
How it calculates
Model: dBV=20log10(Vrms/1V); dBu=20log10(Vrms/0.775V); dBm=10log10(P/1mW); P=Vrms²/R
Assumptions
- Waveforms are symmetric about zero with no DC component. dBm uses delivered power in the entered resistive load; dBu uses the conventional 0.775 V reference. Voltage ratios and power ratios have different dB factors.
Worked example
These are the calculator's default inputs. Change any input above to recalculate.
Inputs
- Input representation
- Vrms
- Input level in selected representation
- 1
- Waveform
- sine
- Resistive load
- 50 Ω
- Voltage-ratio reference RMS
- 1 V
Results
- Peak-to-peak voltage
- 2.82843 V
- dBV
- 0 dB
- dBm
- 13.0103 dB
- RMS voltage
- 1 V
- Peak amplitude
- 1.41421 V
- Load power
- 0.02 W
- dBu
- 2.21397 dB
- Voltage ratio
- 1