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Voltage Regulation with No-Load and Full-Load Denominators

Calculate voltage regulation with no-load and full-load denominators using known measurements, selectable units and clear physical assumptions.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Formula and method

No-load 120 V and full-load 100 V give 16⅔% on the no-load basis and 20% on the full-load basis.

Regulationₙₗ = (Vₙₗ−V𝒻ₗ)/Vₙₗ; Regulation𝒻ₗ = (Vₙₗ−V𝒻ₗ)/V𝒻ₗ

Worked example

Enter these known values and leave the other values blank.

No-load voltage
120 V
Full-load voltage
100 V
Step-down voltage regulation
0.1667
Regulation on no-load basis (%)
16.67 %
Step-up voltage regulation
0.2
Regulation on full-load basis (%)
20 %

Assumptions and limitations

  • Use comparable positive RMS or DC voltage measurements. Both results describe the same drop but use different denominator conventions. This retained workflow requires no-load voltage to exceed full-load voltage.
  • Enter mutually consistent measurements and clear a quantity before inferring it. Calculations use 64 significant digits; the displayed result is rounded separately.

Common questions

Why are the two percentages different?

One divides the voltage drop by the no-load voltage; the other divides by the full-load voltage. Report the denominator convention together with the percentage.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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