ONE FORMULA, ONE ANSWER
Unloaded Voltage Divider Calculator
Check an ideal resistive divider before connecting an ADC or sensor load. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Unloaded output voltage V_out
Enter values and select Calculate.
V_out = V_in R₂ / (R₁ + R₂)
Assumptions
Use R₁,R₂>0. Assume two series resistors, an ideal source and no output load. Significant ADC or other loading requires a different model.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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