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Find the output voltage of a two-resistor divider, or the input voltage or either resistor for a target output, with the divider current and power.
Also covers: Resistor divider calculator ยท Vout calculator ยท Potential divider calculator
V_out = V_in ร Rโ / (Rโ + Rโ)
Rโ is the top resistor (to V_in), Rโ the bottom one (to ground). Assumes nothing draws current from V_out: a load in parallel with Rโ lowers it.
Output voltage (V_out)
3.8367347 V
Divider current 816.3 ยตA, dissipating 9.796 mW in total (6.664 mW in Rโ, 3.132 mW in Rโ).
In other units
Working
Choose the voltage divider equation and which quantity to solve for; the form asks only for the others.
Each input has its own unit picker (kฮฉ, ยตF, mH, MPa, GPa, mm, cP and more), so there's nothing to convert first.
You get the result in your chosen unit and every other unit, plus the rearranged equation with your numbers in SI units.
V_out = V_in ร Rโ / (Rโ + Rโ), where Rโ connects to the input and Rโ to ground. 12 V across 10 kฮฉ and 4.7 kฮฉ gives about 3.84 V.
Anything connected to V_out draws current and acts as a resistor in parallel with Rโ, lowering the output. Keep the load's resistance at least ten times Rโ, or buffer the output.
Not for anything that draws real current. Dividers suit reference voltages, sensors, and level shifting; use a regulator to power a circuit.
No. Every calculation runs in your browser.
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