Percentages, made obvious

Percentage Calculator

Calculate percentages, changes, discounts, margins and markups instantly—with live results, formula steps and visuals that make the answer easy to understand.

✓ No signup✓ Mobile friendly✓ Browser-only math
25%of 18045
+37.5% change
30% off
46.7% margin
Core calculator

Calculate any basic percentage

Switch between the three most common percentage questions. Results update automatically.

Live calculation
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Private by design

Your numbers are calculated in this browser. No account or database is required.

Smart percentage input

Type the problem the way you think it.

PercentScope recognizes common percentage, discount, change and margin phrases locally in your browser.

Instant result$149.25

25% off $199.00 saves $49.75.

Open percent-off calculator
All calculators

One percentage toolkit, many real-world problems

Each tool has a focused page, clear formula and live result.

01Change & growth

Percentage Change Calculator

Measure how much a value increased or decreased relative to where it started. Results update instantly as you type.

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02Growth calculator

Percentage Increase Calculator

Enter a starting value and the percentage increase. PercentScope shows the amount added and the new total immediately.

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03Reduction calculator

Percentage Decrease Calculator

Reduce a starting value by any percentage and see exactly how much is removed and what remains.

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04Compare values

Percentage Difference Calculator

Compare two values without treating either one as the original baseline. The order of the values does not change the result.

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05Work backwards

Reverse Percentage Calculator

Recover the original value before an increase or decrease, or calculate the whole from a known percentage part.

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06Shopping calculator

Percent Off Calculator

See exactly how much you save and what you pay after a percentage discount.

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07Advanced shopping

Discount Calculator

Model real checkout math with stacked discounts, fixed coupons, quantity and tax, then compare two offers side by side.

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08Business pricing

Margin Calculator

Turn cost and selling price into profit, margin and markup, or work backwards from a target margin to the price you need.

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09Pricing calculator

Markup Calculator

Add a markup to your cost and instantly see the selling price, profit and equivalent margin.

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10E-commerce & business

Profit Margin Calculator

Go beyond basic gross margin by including common per-order costs such as shipping, payment fees and customer acquisition.

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11Multi-step percentages

Chained Percentage Calculator

Apply several percentage changes in order and see why percentages cannot simply be added together.

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12Batch calculations

Bulk Percentage Calculator

Run a list of percentage calculations at once instead of repeating the same form. Great for pricing tables, reports and quick comparisons.

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13Part of a whole

Percentage of Total Calculator

Turn a part and a total into a percentage, then see the remaining share visually.

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14Rates & statistics

Percentage Points Calculator

See the difference between percentage points and relative percent change—two measurements that are often confused.

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Live results

No extra Calculate click for ordinary inputs.

Visual explanations

Bars, comparisons and formulas use your own numbers.

Save & reopen

Keep useful calculations locally on your device.

Shareable

Copy, share or print a clean result with the PercentScope link.

Why PercentScope covers more than a basic percent calculator

A single two-field calculator can answer simple questions, but real percentage problems often involve direction, multiple steps or business context. PercentScope separates percentage change from percentage difference, shows margin and markup together, handles stacked discounts and reverse percentages, and includes batch and chained calculations.

Shopping & discounts

Calculate percent off, stack discounts, add a tax estimate, compare two deals and work backwards from a final sale price.

Business & pricing

Calculate margin, markup, target selling price and estimated profit after common per-order costs.