Percentage Calculator
6 modes · Live results · Tip · Discount · Markup · Grade · History · Copy
Free Percentage Calculator — 6 Modes for Every Calculation
Percentages are the most universally useful mathematical concept in everyday life. Whether calculating a restaurant tip, a shopping discount, a salary increase, a business profit margin, or an exam score — percentages are at the centre. The ToolsCoops Percentage Calculator v2 now offers 6 specialized modes with live results, a copy button, and a history of your last 10 calculations.
6 Calculation Modes Explained
| Mode | Formula | Example |
|---|---|---|
| X% of Y | (X ÷ 100) × Y | 15% of 240 = 36 |
| Find What % | (Part ÷ Total) × 100 | 36 of 240 = 15% |
| % Change | ((New - Old) ÷ Old) × 100 | 200 → 250 = +25% |
| Tip Calculator | Tip = Bill × Rate ÷ 100 | $80 bill, 18% tip = $14.40 |
| Discount | Save = Price × % ÷ 100 | $120 at 30% off = $84 |
| Markup/Margin | Markup = (S-C)/C × 100 | Cost $50, sell $70 = 40% markup |
New in v2 — Tip Calculator
The Tip Calculator mode shows tip amount, total bill, and per-person share all at once. Enter the bill amount, tip percentage, and number of people. Perfect for splitting restaurant bills quickly and accurately without mental math.
New in v2 — Discount Calculator
Enter the original price and discount percentage to instantly see the discount amount, final price after discount, and how much you save. Useful when shopping, comparing offers, or evaluating promotional prices.
New in v2 — Markup vs Margin Calculator
Markup and margin are often confused but they measure different things. Markup is calculated on the cost price: (Selling - Cost) ÷ Cost × 100. Margin is calculated on the selling price: (Selling - Cost) ÷ Selling × 100. A 40% markup gives only a 28.6% margin. Enter your cost and selling price to see both simultaneously.
New in v2 — Calculation History
Your last 10 calculations are saved in the session. This is especially useful when comparing multiple scenarios — for example, comparing discounts from different stores, or calculating tips at different percentages. Click Clear to reset the history at any time.
Common Percentage Mistakes to Avoid
- Percentage points vs % change: A rate rising from 3% to 5% is +2 percentage points but +66.7% as a percentage change.
- Asymmetric changes: +20% then -20% ≠ original value. $100 → $120 → $96.
- Markup ≠ Margin: A 50% markup ≠ 50% margin. Always clarify which one you mean.
- Reversing part and total: (25 ÷ 100) and (100 ÷ 25) give completely different answers.
Percentages in Real Life
- Finance: Interest rates, investment returns, tax calculations, salary increases.
- Shopping: Discount amounts, cashback, sale prices, VAT.
- Business: Profit margins, conversion rates, year-over-year growth.
- Education: Exam scores, grade weightings, attendance rates.
- Health: Body fat %, medication dosages, clinical trial results.
