Free Percentage Calculator
Calculate percent of a number, percentage change, discounts, markups, and share of total.
Calculate percentages, discounts and change
Real-world use case
Useful for supplier price increases, ecommerce discounts, margin comparisons, and ad budget changes.
Common mistakes
- Confusing percentage points with percent change.
- Calculating discount from the wrong base price.
- Rounding too early.
When this tool is not enough
For accounting or tax work, verify the final numbers in your formal spreadsheet.
FAQ
Can I calculate percent increase?
Yes. Enter old and new values.
Can I use it for discounts?
Yes. Enter original price and discount rate.
Percentage calculations for real decisions
Percentages appear in discounts, profit margins, price increases, tax estimates, growth reports, supplier quotes, and campaign results. A quick calculator helps prevent mental math errors before you make a pricing or comparison decision.
Best use cases
- Calculate a discount price or sale reduction.
- Compare percentage increase or decrease between two values.
- Estimate margin, markup, conversion rate, growth rate, or change over time.
Common mistakes to avoid
- Mixing percentage points with percentage change.
- Calculating margin and markup as if they are the same thing.
- Rounding too early when the number will be used in a quote, invoice, or report.
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