Percentage Calculator

Percentages are everywhere in daily life: store discounts, restaurant tips, investment returns, exam scores, tax rates, and fitness goals. Despite how often we encounter them, many people still pause when asked to compute 15% of a bill or figure out whether a 25% raise beats a fixed bonus. This free percentage calculator removes the guesswork by handling the four most common percentage operations in one clean interface.

The calculator runs entirely in your browser, so nothing you type is sent to a server. It is equally useful for students checking homework, shoppers comparing sale prices, small-business owners calculating margins, and professionals forecasting growth.

The Percentage Calculator supports four modes. Percentage Of answers questions such as “What is 18% of $250?” Increase finds the result after adding a percentage, which is useful for raises, inflation adjustments, and investment growth. Decrease finds the result after subtracting a percentage, which is handy for discounts, depreciation, and budget cuts. Difference measures the relative change from one value to another, such as comparing last quarter revenue to this quarter.

Select the mode that matches your problem. Enter the percentage in the first field and the base number in the second field for Percentage Of, Increase, and Decrease. For Difference, enter the two values you want to compare. The result updates instantly as you type, so you can experiment with different numbers without pressing a button.

• Shopping: Find the sale price after a 30% discount or the total after adding 8% sales tax.
• Dining: Calculate a 15%, 18%, or 20% tip on a restaurant bill.
• Finance: Measure investment returns, interest growth, or year-over-year spending changes.
• Education: Convert test scores to percentages and calculate grade improvements.
• Health: Track bodyweight changes or express macronutrients as a percentage of daily calories.

Suppose your current salary is $50,000 and your employer offers a 6% raise. To find your new salary, switch to Increase mode, enter 6 in the percentage field and 50000 in the original value field. The calculation is $50,000 × 1.06 = $53,000. Your annual increase is $3,000.

If you instead want to know what percentage $3,000 is of $50,000, use Percentage Of in reverse: the result of 6% of $50,000 is $3,000, confirming the raise percentage. These cross-checks help prevent payroll or budgeting errors.

• Always identify the base value. A percentage only has meaning relative to the number it is taken from.
• Do not confuse percentage change with percentage points. Moving from 5% to 8% is a 3 percentage point increase but a 60% relative increase.
• Sequential percentages do not cancel out. A 20% increase followed by a 20% decrease leaves you below the original value.
• When reversing a percentage, divide by the remaining factor. For a 25% discount, divide the final price by 0.75 to recover the original price.