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Percentage Increase / Markup Calculator

Calculate percentage increases, decreases, changes, and markup percentages quickly and accurately.

All calculations happen in your browser — nothing you enter is sent anywhere.

Results

Absolute Change
20.00
Percentage Change
20.00%
Percentage Increase
20.00%
Percentage Decrease
N/A

About this tool

Calculates the percentage change between two values (with the increase/decrease clearly separated), or a two-way markup calculation: cost and markup % to a selling price, or cost and selling price to a markup %. Percentage change and markup are related but distinct — this tool keeps them clearly separate.

How to use it

  1. Choose "Percentage Change" for any two values, or a markup calculation for pricing.
  2. Enter the values.
  3. Read the result — percentage change, increase/decrease, or markup, as applicable.

The formulas

  • Percentage Change = ((New Value − Original Value) ÷ Original Value) × 100
  • Markup % = ((Selling Price − Cost) ÷ Cost) × 100

FAQ

What is the difference between percentage change and markup?

Percentage change compares any two values (e.g. last month’s sales vs. this month’s). Markup specifically compares a selling price to a cost — they use different formulas and different contexts, even though both are percentages.

How do I calculate percentage increase?

Percentage Change = ((New Value − Original Value) ÷ Original Value) × 100. If the result is positive, that is your percentage increase.

How do I calculate markup from cost and selling price?

Markup % = ((Selling Price − Cost) ÷ Cost) × 100.

What happens if the original value or cost is zero?

The calculator shows the percentage as "N/A" rather than an error or an infinite number, since a percentage change or markup from zero is mathematically undefined.

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This is a free tool provided by Goeroe Digital. All results, generated files, and figures are estimates or drafts for general informational use only. Goeroe Digital accepts no responsibility or liability for any output, outcome, loss, or decision arising from the use of these free tools — always review the results yourself before relying on them.