Percentage Calculator
Calculate percentages, margin vs markup, compound increase or decrease, tips, sales tax, discount, and GST with shareable calculation state
How it works
Solve percent math
Choose a percent mode, enter values, then review the calculated result
- Choose modePick percent, change, tax, or margin math.
- Enter valuesAdd the numbers for the selected mode.
- Review answerCopy, download, or share the result.
Calculate
Choose your percentage mode
Pick the calculation you need, then enter only the relevant values
Results update automatically as you change values.
Result
Results update automatically as values change.Percentage of a value
10.00
10.00% of 100.00
Decimal multiplier: 0.10
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Tool guide
Why use this percentage calculator?
This free percentage calculator helps with quick percent math, margin vs markup pricing, compound growth or decline, tip splitting, discount planning, GST, and sales tax calculations.
Margin and markupTax and GSTShare-ready
FAQs
What is the difference between margin and markup?
Margin is based on selling price, while markup is based on cost. This calculator shows both views.
Can I compound a decrease?
Yes. Use compound mode and switch from increase to decrease to model repeated reduction.
Is sales tax separate from GST?
Yes. Sales tax and GST have separate dedicated modes so they can be used independently.
Does the share link save my exact values?
Yes. The current mode and field values are stored in the URL so the exact calculation can be reopened.
Should I verify financial or tax results?
Yes. Use percentage results as quick estimates and cross-check important financial, tax, billing, or official decisions independently.
Can I copy or download the result?
Yes. Copy the calculation, download its result card, or copy a share link.