The tool below calculates the DC voltage from AC voltage.
Background
A full-wave rectifier is an electronic circuit that converts AC to DC by rectifying both halves of the AC waveform, resulting in a more efficient conversion compared to a half-wave rectifier.
The DC or averaged value of the output waveform is given by the formula below.
Formula
VDC = (2/Ï€)*(Vmax)
where Vmax is the peak AC voltage value and VDC is the output. The multiplier in the equation is 2/Ï€ or 0.637.
How is this formula derived?
The area under the curve A is equal to h x w
where h is the height and w is the width. VDC is the height and therefore given by VDC = A/w
 A = 0 ∫ π sin(x) dx = −cos(x)|0π = 2
The width is simply π-0 = π
Therefore VDC = 2/Ï€*Vmax (we have to scale it by Vmax as the calculation above is for a peak value of 1).
Example Calculation
For a peak AC value of 1 Volt, the equivalent DC value is 0.637 Volt.