Percentage Decrease Calculator

Calculate the percentage decrease between two values. This calculator helps you determine how much one value has decreased relative to another, expressed as a percentage.

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$

Value Difference

$0.00

Percentage Change

0%

Enter values to see the percentage decrease

How to Calculate Percentage Decrease:

  1. Subtract final value from starting value
  2. Divide by the absolute value of the starting value
  3. Multiply by 100 to get the percentage
  4. If result is negative, it indicates an increase instead

Formula:

Percentage Decrease = ((Starting Value - Final Value) / |Starting Value|) × 100

Example Calculation

Let's say you want to calculate the percentage decrease in energy consumption when switching from a 60-watt traditional bulb to an 8-watt LED bulb:

Starting Value = 60 watts

Final Value = 8 watts

Difference = 60 - 8 = 52 watts

Percentage = (52 / |60|) × 100 = 86.67%

Result: 86.67% decrease in energy consumption

Common Applications

Business and Finance

  • Price reductions and discounts
  • Cost savings analysis
  • Budget cuts
  • Revenue decline analysis
  • Market value depreciation

Science and Engineering

  • Energy consumption reduction
  • Efficiency improvements
  • Environmental impact reduction
  • Resource usage optimization

Personal Finance

  • Expense reduction
  • Savings goals
  • Debt reduction
  • Investment losses

Important Notes

  • A negative percentage indicates an increase rather than a decrease
  • The starting value cannot be zero (division by zero)
  • The calculator handles both small and large value differences
  • Results are rounded to 2 decimal places for clarity
  • Both positive and negative input values are supported