Welcome to HowToChange.com's free online tool to calculate percentage change. Enter your old and new values to see how much something has increased or decreased as a percentage. Supports numbers and time formats like hh:mm, mm:ss, or hh:mm:ss.
Percentage change measures how much a value has increased or decreased relative to its original (old) value. It's useful for tracking changes in prices, weights, times, or any measurable quantity.
Key Points:
\[ \text{Percentage Change} = \left( \frac{V_2 - V_1}{|V_1|} \right) \times 100 \]
Where:
Change = 2.625 - 3.50 = -0.875
|V₁| = 3.50
Fraction = -0.875 / 3.50 = -0.25
Percentage = -0.25 × 100 = -25%
Result: 25% decrease
Reverse (from 2.625 to 3.50): 33.33% increase
Change = 25 - (-25) = 50
|V₁| = 25
Fraction = 50 / 25 = 2
Percentage = 2 × 100 = 200%
Result: 200% increase
Change = -50 - (-25) = -25
|V₁| = 25
Fraction = -25 / 25 = -1
Percentage = -1 × 100 = -100%
Result: 100% decrease
This calculator does not reverse-solve (e.g., find new value from percent). For time values, we convert to seconds for accurate calculation. If you need improvements, let us know!
Percentage change shows how much a value has increased or decreased compared to its original value, expressed as a percentage. Positive result means increase, negative means decrease.
To correctly handle negative old values (e.g., from -25 to 25 is 200% increase). Without absolute value, the direction can be misleading.
Yes! Enter time as hh:mm:ss, mm:ss, or hh:mm. It converts everything to seconds internally for accurate percentage calculation.
Percentage change is undefined (can't divide by zero). The tool will show an error message. In real scenarios, avoid calculating % change from zero.
Percentage change uses the old value as base (has direction: increase/decrease). Percentage difference uses average of both values (no direction, symmetric).
Because the base value changes. E.g., 25% increase on 100 = 125, but to go back to 100 needs ~20% decrease (not 25%).
No – percentages are not additive in that way. E.g., -40% then +60% is not +20%. Apply each change sequentially on the updated value.
Yes, it uses the standard formula used in finance and statistics. It handles negative values correctly for losses/gains.
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