Calculate the percentage increase or decrease between two numbers.
A percentage change calculator determines the percent increase or decrease between two numbers, showing both the percentage difference and absolute change in value. Formula: ((New Value - Old Value) / Old Value) × 100. Essential for comparing values over time: stock price changes, business revenue growth, weight loss progress, salary increases, test score improvements, and any metrics tracked over time. Positive percentage indicates increase, negative indicates decrease. Used by investors analyzing returns, businesses tracking growth metrics, students calculating grade improvements, and anyone comparing before-and-after measurements.
Make accurate comparisons by converting absolute changes into meaningful percentages—$5,000 raise means different things on $30k salary (16.7% increase) versus $100k salary (5% increase). Track business performance objectively: 25% revenue growth year-over-year is excellent, 5% is modest, negative percentages indicate declining performance. Evaluate investment returns properly: portfolio growing from $10k to $15k represents 50% gain, requiring market understanding. Calculate discount or markup percentages for pricing decisions. Understand compounding effects: 10% annual growth for 5 years doesn't equal 50% total growth (actually 61% due to compounding). Avoid percentage confusion in news: "50% increase then 50% decrease" doesn't return to original (actually 25% below starting point).
Enter original value (starting number) and new value (ending number). Calculator shows percentage change (positive for increase, negative for decrease), absolute difference in units, and interpretation. For percentage increase: salary $50k to $65k shows +30% increase ($15k raise). For percentage decrease: weight 200 lbs to 180 lbs shows -10% decrease (20 lbs lost). Use for comparing: sales Q1 $100k versus Q2 $125k = +25% growth. Remember direction matters: 50% increase from 100 to 150, but 33% decrease from 150 back to 100. Can reverse calculate: "I need 20% increase on $60k" = $72k target. Useful for goal setting: lose 10% body weight, increase revenue 25%, improve test scores 15%.
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