How do I calculate a percentage of a number?

Multiply the number by the percentage divided by 100. For example, 25% of 200 = 200 × (25/100) = 50.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. Positive means increase, negative means decrease.

What is the difference between percentage and percentage points?

Percentage points measure the arithmetic difference between two percentages. Going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.

How do I reverse a percentage?

If you know the result and percentage, divide the result by the percentage (as a decimal). If 30% of X = 60, then X = 60 / 0.30 = 200.

How do I calculate a percentage of a number?

Multiply the number by the percentage divided by 100. For example, 25% of 200 = 200 × (25/100) = 50.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. Positive means increase, negative means decrease.

What is the difference between percentage and percentage points?

Percentage points measure the arithmetic difference between two percentages. Going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.

How do I reverse a percentage?

If you know the result and percentage, divide the result by the percentage (as a decimal). If 30% of X = 60, then X = 60 / 0.30 = 200.

Educational Tool — Estimates for educational purposes only. Not financial advice.Disclaimer

Percentage calculations come up everywhere — shopping discounts, grade calculations, financial analysis, and more. This calculator handles all common percentage problems quickly.

Percentage Calculator

Calculate percentages, percentage changes, and "what percent" questions.

January 2026

Calculation Type

First Value

Second Value

Your Results

Result

Description

Wally's Analysis

AI-powered interpretation of your results

AI Summary

Key Insights

Optimization

What-If Scenarios

Financial Planning Tools

Take control of your finances with comprehensive planning tools.

Explore Tools

We may earn a commission from partner links. This does not affect our recommendations.

AI Disclosure

Wally's Analysis uses GPT-4o-mini for educational interpretations. AI responses are not personalized financial advice and may be inaccurate. All core calculations are deterministic — AI only interprets results.AI Transparency →

Accuracy Commitment

Industry-standard formulas vetted against IRS, SSA, BLS, CFPB. Client-side calculations. Regularly updated.

Results are mathematical calculations.

Updated: January 2026 · Methodology

Frequently Asked Questions

Related Calculators

🏷️

Discount

Calculate the final price after one or two discounts are applied.

🍽️

Tip

Calculate tip amounts and split bills between multiple people.

🧾

Sales Tax

Calculate sales tax on purchases or extract the tax from a total price.

Boost Productivity

Free typing, grammar, and focus tools.

SkillFocusLab