Math & Shopping

Percentage Calculator

Solve everyday percentage problems—discounts, commissions, and percentage change—with AI-guided explanations.

Calculator modes

Usage examples

  • Apply 20% off to a price before tax.
  • Calculate a 7% sales commission or tip.
  • Use the markup vs margin calculator to compare gross margins.

Enter your values

Result

18

15% × 120

How to work through percentage problems

Pick the scenario that matches your question, then plug in the known values.

  1. Choose a mode

    Select percent of, what percent, percent change, or percent difference.

  2. Enter values

    Fill the labeled fields. The calculator adapts labels for discounts, markups, tips, or grades.

  3. Review outputs

    Read the percentage, decimal, fraction, and sentence explanation.

  4. Save or reset

    Copy the summary for reports or switch scenarios for the next calculation.

Case study: Retail markdown planning

A merchandiser needs to set discount signage during an end-of-season sale.

Original price
$89
Sale price
$62
  1. Percent decrease

    Percent change mode with original 89 and new 62 returns a 30.34% markdown.

  2. Communication

    The sentence output is copied to signage documentation for the store team.

  3. Cross-check

    Fraction output (roughly 3034/10000) helps verify accuracy with manual math.

Store action

The merchandiser confirms the discount labels and updates pricing in the POS system.

Percentage calculator FAQs

Can I tell if the change is an increase or decrease?

Yes. Percent change labels the result as increase or decrease automatically.

Does it support negative values?

Negative numbers work for loss or negative growth scenarios.

How do I share the answer?

Copy the explanation sentence or revisit it in the history list.

Further reading

  • Percentage tutorial
  • Gross margin vs markup
  • Percent error reference

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