AixKit
All-in-One Online Calculators
AixKit
All-in-One Online Calculators
Part of: Math →
This percentage (percent) calculator solves the six most common percentage problems without requiring you to remember any formulas. This tool is part of AixKit's core math and finance calculator suite.
Calculates a portion of a number. Use it for tips (15% of $60), tax (8% of $240), or any situation where you need a specific percentage of a value. Formula: (X ÷ 100) × Y.
Tells you what fraction one number is of another, expressed as a percentage. Useful for exam scores (45 out of 60), completion rates, or tracking progress toward a goal. Formula: (X ÷ Y) × 100.
Measures how much a value has grown relative to its original. Use it for salary raises, price increases, or metric growth — for example, a salary rising from 3,000 to 3,600 is a 20% increase. Formula: ((New − Old) ÷ Old) × 100.
Measures how much a value has fallen relative to its original. Use it for price drops, weight loss, or cost reductions — for example, a price falling from 80 to 60 is a 25% decrease. Formula: ((Old − New) ÷ Old) × 100.
Compares two values without treating either as the "original." Unlike percentage change, it uses the average of both values as the base — useful when comparing data from two independent sources. Formula: |A − B| ÷ ((A + B) ÷ 2) × 100.
Shows exactly how much you save and what you pay after a discount. Enter the discount percentage and the original price to see both the saving and the final amount. For more detailed shopping calculations, see our Percent Off Calculator.
| What You Want to Find | Formula | Example |
|---|---|---|
| X% of Y | (X ÷ 100) × Y |
20% of 150 = 30 |
| X is what % of Y | (X ÷ Y) × 100 |
45 is 75% of 60 |
| Percentage increase | ((New − Old) ÷ Old) × 100 |
60 to 75 = +25% |
| Percentage decrease | ((Old − New) ÷ Old) × 100 |
80 to 60 = 25% decrease |
| Percentage difference | |A − B| ÷ average(A,B) × 100 |
40 vs 60 = 40% difference |
| Percent off (discount saving) | Price × (Discount% ÷ 100) |
20% off $90 = $18 saving |
Percentage change and percentage difference use different bases — change uses the original value; difference uses the average. Always pick the formula that matches your actual question.
A jacket is $120 with a 25% discount. Saving = 120 × 0.25 = $30. Final price = $120 − $30 = $90. Use the "Percent Off" tab above.
A student scores 54 out of 80. What percentage did they score? (54 ÷ 80) × 100 = 67.5%. Use the "X is what % of Y" tab.
A salary rises from $3,000 to $3,600 per month. Percentage increase = ((3600 − 3000) ÷ 3000) × 100 = 20%. Use the "% Increase" tab.
A product drops in price from $250 to $190. Percentage decrease = ((250 − 190) ÷ 250) × 100 = 24%. Use the "% Decrease" tab.
Website traffic is 4,800 this month vs 5,200 last month. Percentage difference = |4800 − 5200| ÷ ((4800 + 5200) ÷ 2) × 100 = 400 ÷ 5000 × 100 = 8%. Use the "% Difference" tab.
Finding a portion of a number — tips, VAT, sales tax, commission, or any fixed-rate deduction. You know the percentage and need the actual amount.
Finding a ratio expressed as a percentage — exam marks, completion rate, budget usage, or market share. You know both numbers and need the percentage relationship.
Measuring growth from a known starting point — salary change, revenue growth, follower count, or any metric that went up. The original value is the reference point.
Measuring a reduction from a known starting point — price drops, expense cuts, weight loss, or traffic decline. Use this when the new value is lower than the original.
Comparing two equal-standing values where neither is the "before" — two products at different prices, two test groups, or two datasets. The result is symmetric: A vs B gives the same answer as B vs A.
Shopping discounts and sale prices. You know the discount percentage and need to know the saving and the price you actually pay. For further discount calculations, see our Percent Off Calculator or use the Average Calculator to compare prices across multiple items.
Percent off, clearance sales, cashback offers, and coupon codes all require percentage calculations to find the actual saving and final price. Quick mental math often leads to errors — the calculator removes that risk.
Convert raw scores to percentages, find the marks needed to hit a target grade, or calculate how much a score needs to improve. "X is what % of Y" covers most grade-related questions.
Track spending as a percentage of income, calculate interest on savings, estimate VAT or GST on purchases, or find the percentage return on an investment. For detailed financial tools, try our Sales Tax Calculator.
Month-over-month revenue growth, customer retention rates, conversion rate improvements, and profit margin calculations are all percentage change problems. Percentage increase and decrease tabs handle these directly.
Compare sessions, bounce rate, or conversion figures between two periods using percentage difference or percentage change. The choice between the two depends on whether there is a clear "before" period.
Sales commissions (X% of revenue), supplier markup (X% added to cost), and retail margins are all "X% of Y" calculations. Enter the rate and the base value to find the final amount instantly.
Business owners often use this alongside the Profit Margin Calculator and Break-even Calculator to cross-check pricing percentages and confirm margin targets before finalising any pricing decision.