Voltage Unbalance Percentage Calculator
Calculate voltage unbalance percentage with clear inputs, formula guidance, and practical result checks.
Voltage Unbalance Percentage measurements
Enter your values, then calculate.
Result
How to calculate voltage unbalance percentage
This calculator finds voltage unbalance percentage by dividing the maximum voltage deviation from average by the average voltage — a three-phase power quality diagnostic.
How the calculation works
Voltage unbalance = (Maximum deviation ÷ Average voltage) × 100.
Example
A 4V maximum deviation from a 480V average across three phases: (4÷480)×100 ≈ 0.83%.
Frequently asked questions
How is Result calculated?
Result = ([Maximum voltage deviation] ÷ [Average voltage]) × 100.
Is the Voltage Unbalance Percentage Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Voltage Unbalance Percentage Calculator
Voltage unbalance = (Maximum deviation ÷ Average voltage) × 100.
Let's understand your voltage unbalance percentage result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Voltage Unbalance Percentage
- Voltage unbalance above roughly 1% is commonly flagged as worth investigating for three-phase motor loads, since unbalance significantly stresses motor windings and can shorten motor life.
- Even small voltage unbalance percentages can cause disproportionately larger current unbalance in three-phase motors, a relationship often cited as an approximate 6-10x amplification.
Common Voltage Unbalance Percentage Mistakes to Avoid
- Assuming a small voltage unbalance percentage is automatically harmless, when even modest unbalance can cause substantially larger current unbalance and motor stress due to the amplification effect in three-phase motor windings.
When to Use This Calculator
This calculator finds voltage unbalance percentage by dividing the maximum voltage deviation from average by the average voltage — a three-phase power quality diagnostic.