Percentage Calculator
Calculate percentages, margin vs markup, compound increase or decrease, tips, sales tax, discount, and GST with shareable calculation state.
What this calculator gives you
Core percentage math
Find percentages of values, reverse percentages, and percentage changes quickly.
Business pricing modes
Switch between margin and markup, compare discount, GST, and sales tax outputs.
Share exact state
Copy a share link with the current mode and values preserved in the URL.
Results update automatically as you change values.
Percentage of a value
10.00
10.00% of 100.00
Decimal multiplier: 0.10
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.
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.