Percentage Calculator
Calculate a percentage of a number, or find what percent one number is of another. Free percentage calculator for discounts, tips, and stats.
A percentage calculator solves the most common percentage problems in one step. Enter a base number and a percentage, and the calculator gives you three results: the percentage value (e.g. 15% of 200 = 30), the total including that percentage (200 + 30 = 230), and the remaining amount (200 − 30 = 170). This covers virtually every everyday percentage question — from calculating a tip, to figuring out a sale discount, to computing a grade. This tool handles negative percentages too, so you can compute decreases and reductions. It is much faster than opening a spreadsheet and typing a formula, and the three-output format means you get every useful number from one calculation. Free, private, and no sign-up required.
base
rate
Result
Breakdown
- Total With Percent
- 230.00
- Remaining
- 170.00
About Percentage Calculator
What is percentage calculator?
A percentage calculator solves the most common percentage problems in one step. Enter a base number and a percentage, and the calculator gives you three results: the percentage value (e.g. 15% of 200 = 30), the total including that percentage (200 + 30 = 230), and the remaining amount (200 − 30 = 170). This covers virtually every everyday percentage question — from calculating a tip, to figuring out a sale discount, to computing a grade. This tool handles negative percentages too, so you can compute decreases and reductions. It is much faster than opening a spreadsheet and typing a formula, and the three-output format means you get every useful number from one calculation. Free, private, and no sign-up required.
How to use this calculator
- Enter your base number.
- Enter your percentage.
- Click the "Calculate" button.
- View your result instantly — the main result is displayed prominently at the top with a detailed breakdown below it.
When to use this calculator
- Calculating tips, discounts, and sale prices while shopping
- Computing percentage scores on tests and assignments
- Finding the percentage increase or decrease between two values
- Calculating markups and margins for small business pricing
- Teaching students the concept of percentages with instant feedback
How the calculation works
The percentage calculator uses three direct formulas from two inputs. Percent value = base × percent / 100. Total with percent = base + percent_value. Remaining = base − percent_value. For example, a base of 200 and 15%: percent_value = 200 × 15/100 = 30, total_with_percent = 200 + 30 = 230, remaining = 200 − 30 = 170. For a negative percent (−20%): percent_value = 200 × (−20)/100 = −40, total = 160, remaining = 240. The simplicity of these formulas is why percentage math is universal — the same operation powers tips, discounts, taxes, grades, and statistics.
Frequently Asked Questions
How do I calculate a percentage?▼
What is the difference between percent and percentage points?▼
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