Bridge Rectifier Calculator — AC to DC Conversion
Enter the AC RMS voltage, supply frequency, load resistance and diode forward voltage to calculate the average and peak DC output, ripple factor, output ripple frequency, peak inverse voltage per diode, output current, power and rectifier efficiency.
V
Hz
Ω
V
Mean value of the full-wave rectified waveform after diode drops
- 1
Peak input voltage
120 × √2 = 169.706 - 2
Peak DC output
169.706 − 2 × 0.7 = 168.306Two diodes are always in series; each drops Vf on every half-cycle. - 3
Average DC output
2 × 168.306 ÷ π = 107.147
How does this calculator work?
A bridge rectifier converts AC to pulsating DC: average output Vdc = (2/π) × (Vrms√2 − 2Vf), ripple frequency is twice the supply, and each diode must block PIV = Vrms√2. Theoretical efficiency peaks at 81.2%. Enter RMS voltage, frequency, load and diode Vf to get all key parameters.
Formula
How this is calculated
A bridge rectifier uses four diodes arranged so that both half-cycles of the AC input appear as positive half-cycles at the output — this is full-wave rectification. During the positive half-cycle, two diodes (D1 and D2) conduct; during the negative half-cycle, the other pair (D3 and D4) conducts. Because two diodes are always in series with the load, the peak output voltage is reduced by twice the diode forward voltage: Vpeak_out = Vrms × √2 − 2 × Vf. The average (mean) DC output is then (2 × Vpeak_out) / π ≈ 0.636 × Vpeak_out.
The output is not perfectly smooth — it pulses at twice the supply frequency (the ripple frequency). The RMS ripple voltage and ripple factor quantify how much AC remains on the DC rail before filtering. For a full-wave rectifier the theoretical ripple factor is approximately 0.483; adding a smoothing capacitor dramatically reduces this. Each diode must withstand a peak inverse voltage equal to the full peak input voltage (Vpeak), which is the blocking voltage spec to use when selecting components.
Rectifier efficiency (DC power out / AC power in) has a theoretical maximum of about 81.2% for an ideal full-wave bridge. Real efficiency is slightly lower because of diode conduction losses (Vf drop), capacitor ESR, and transformer copper losses. This calculator assumes a purely resistive load and ideal filtering is not applied — it outputs the unfiltered rectified waveform parameters.
Frequently asked questions
A full-wave rectifier flips the negative half-cycles positive, so the average is the mean of a full-wave rectified sinusoid: (2/π) × Vpeak ≈ 0.636 × Vpeak. A half-wave rectifier only passes one half-cycle, giving half that average (0.318 × Vpeak).
PIV is the maximum reverse voltage a diode must block without breaking down. For a bridge rectifier, each diode sees a PIV equal to the peak input voltage (Vrms × √2). Choose diodes with a reverse breakdown voltage comfortably above this — typically 1.5–2× the PIV for safety margin.
Add a smoothing capacitor across the load. A larger capacitance reduces ripple voltage (approximately Vripple ≈ Iload / (2 × f × C) for full-wave). LC or π-filters give even lower ripple, and linear or switching regulators following the rectifier eliminate most of the remaining ripple.
Also known as
TG we-Calculate Editorial Team. (2026). Bridge Rectifier Calculator — AC to DC Conversion [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/bridge-rectifier-calculator
TG we-Calculate Editorial Team. "Bridge Rectifier Calculator — AC to DC Conversion." TG we-Calculate. 2026. https://we-calculate.com/calculator/bridge-rectifier-calculator.
TG we-Calculate Editorial Team, "Bridge Rectifier Calculator — AC to DC Conversion," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/bridge-rectifier-calculator
@misc{wecalculate_bridge_rectifier_calculator, title = {Bridge Rectifier Calculator — AC to DC Conversion}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/bridge-rectifier-calculator}}, year = {2026}, note = {TG we-Calculate} }
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