Free Percentage Calculator Online

Calculate percent of a number, what percent A is of B, and percentage increase or decrease. Also discount and tip with tax. Fast, accurate, ad-free.

Popular Calculators

Percentage Increase Calculator

Calculate percentage increase instantly.

What Percent is A of B Calculator

See what percent one number is of another fast.

Percentage of a Number Calculator

Quickly find X% of any number in seconds.

Percentage Decrease Calculator

Find percentage drops quickly and easily.

Percentage Change Calculator

Calculate percentage increase or decrease instantly.

Discount Calculator

Easily calculate final price and savings.

All Calculators

Percentage of a Number Calculator

Quickly find X% of any number in seconds.

What Percent is A of B Calculator

See what percent one number is of another fast.

Percentage Increase Calculator

Calculate percentage increase instantly.

Percentage Decrease Calculator

Find percentage drops quickly and easily.

Percentage Change Calculator

Calculate percentage increase or decrease instantly.

Discount Calculator

Easily calculate final price and savings.

Tip Calculator with Tax

Split bills and calculate tips with tax fast.

Tax Calculator

Quickly estimate taxes and net income.

Percentage Points Calculator

Find the absolute difference between two percentages.

Percentage Difference Calculator

Compare two values and find their percentage difference.

BMI Calculator

Calculate your Body Mass Index with category and health insights.

Roman Numeral Calculator

Convert numbers to Roman numerals and dates instantly.

All Calculators

Explore all percentage tools in one place — find, compare, and calculate easily.

Comparing Tools

Not sure which calculator fits your situation? Here's a quick way to tell them apart — with a few real-life hints.

Percentage Increase
When something goes up — salary, revenue, or prices.
Example: $50 → $60 is a 20% increase.
Percentage Decrease
When something drops — sales, expenses, or weight.
Example: 200 → 180 is a 10% decrease.
Percentage Change
Works both ways — increase or decrease in one simple formula.
Example: $80 → $100 (25% up) or $100 → $80 (20% down).
Percentage Difference
Compare two independent values, like test scores or quotes.
Example: 240 vs 252 = 4.8% difference.
Percentage Points
Shows the absolute gap between two percentages — like 4% vs 6%.
That's a 2-point difference, not a 50% increase.
What Percent is A of B
Perfect for quick, everyday questions.
"25 is what percent of 100?" → 25%.

Which Calculator Does What?

Scenario	Use this	Why	Example
Old value → new value	Percentage Increase	Directional growth from a baseline	50 → 60 = +20%
Drop from original	Percentage Decrease	Directional decline from a baseline	200 → 180 = −10%
General increase or decrease	Percentage Change	Single formula for both directions	72 → 90 = +25%
Compare two independent values	Percentage Difference	Symmetric comparison using the average	2.40 vs 2.52 = 4.92%
From 2% to 3%	Percentage Points	Absolute difference between percentages	+1 pp, +25% relative
Find X% of Y / What percent is A of B?	Percentage of a Number or What Percent is A of B	Part-of-whole ratios	25 is 25% of 100

Worked Example

Question: Is B 18% higher than A, or ~16%?

A = 200, B = 236
Change = 236 − 200 = 36

Percent change (directional):
36 ÷ 200 × 100 = 18%

Percent difference (symmetric):
36 ÷ ((200 + 236)/2) × 100 ≈ 16.28%

Different questions, different answers. Use Percentage Change for directional change, and Percentage Difference for a symmetric comparison.

Real-World Scenarios

Salary offer comparison

Offer A: $78,500 vs Offer B: $82,000. Use Percentage Difference → result ≈ 4.46% higher.

Ad campaign lift

CVR 2.4% → 3.1%. Use Percentage Points (+0.7 pp) and Percentage Increase (+29.2%).

Price drop at checkout

$129 with 15% off. Use Discount → final $109.65.

Traffic change MoM

12,400 → 11,050. Use Percentage Change → −10.89%.

Portfolio growth

$10,000 grows 8% then 6%. Compound → $11,648 total, not 14% simple.

Is 25 of 100 the same as 25%?

Use What Percent is A of B → 25%. Be careful with decimals and units.

Methodology & Accuracy

Our calculators use standard percentage formulas with banker's rounding to two decimals by default. For multi-period growth we compound (Value × (1 + r) per period). Percentage points measure absolute changes in rates; percentage change measures relative change from the baseline.

Edge cases: division by zero returns "undefined"; negative baselines preserve sign. Examples on each tool page show the exact steps we use.

Common Mistakes

Dividing by the new value instead of the original baseline.
Averaging percentage changes across months instead of compounding.
Confusing percent change with percentage points (pp).
Mixing units (unique visitors vs pageviews, net vs gross).
Ignoring sign when the original value is negative.

Glossary (Quick)

Percent change: Relative change from the original value.
Percentage points: Absolute difference between two percentages.
Compounding: Applying growth sequentially: value × (1 + r) per period.
Baseline: The original value used in the denominator.
Symmetric vs directional: Difference vs change from an original (average vs baseline).
Absolute vs relative: Magnitude vs proportion of the baseline.

Frequently Asked Questions

Which calculator should I use?

For growth use Percentage Increase. For decline use Percentage Decrease. For directional change use Percentage Change. For a symmetric comparison use Percentage Difference. For part-of-whole problems use Percentage of a Number or What Percent is A of B.

What's the difference between percent increase and percentage points?

Percent increase is a relative change; percentage points are an absolute difference. Going from 4% to 5% is +1 pp and a +25% relative increase.

Can I compare two values without choosing an "original"?

Yes. Use the Percentage Difference Calculator. It compares two numbers relative to their average, so A/B order does not matter.

How do I calculate these in Excel/Google Sheets?

Increase: =(B2-A2)/A2, Decrease: =(A2-B2)/A2, Change: =(B2/A2)-1, Difference: =ABS(A2-B2)/((A2+B2)/2). Then format as %.

Still unsure? Start with the Percentage Change Calculator.