What is X% of Y, or how much did it change?
Use PercentCalc for a percentage amount, one number as a percentage of another, percentage change or a reverse-percentage check.
Percentages and price checks
Choose the right percentage and pricing calculator
A percentage amount, a discount, a profit margin and a unit price use different bases. This guide helps you choose the focused calculator and verify the arithmetic without changing any existing product URL.
Calculation base kept visibleWorked checks includedNo account required
Start with the question
Match the price question to the calculator
Name the result you need before entering numbers. That prevents a percentage of cost from being mistaken for a percentage of selling price.
What will I pay after a discount?
Use DiscountCalc for amount saved, final sale price, fixed coupons, stacked discounts or the original price before a reduction.
What are the margin, markup or target price?
Use MarginCalc when cost and selling price are involved. It keeps margin on revenue separate from markup on cost.
Which package costs less per unit?
Use UnitPrice to normalize package price and quantity into the same unit before comparing sizes or multipacks.
Four worked checks
Use the correct base for each calculation
These compact examples make the denominator and final check visible.
- 15% of 240 = 36
- Convert 15% to 0.15, then multiply 240 × 0.15. Check: 36 ÷ 240 = 15%.
- 20% off 80 = 64 final
- The saving is 80 × 0.20 = 16, so the final price is 80 − 16 = 64.
- Cost 60, price 100
- Profit is 40. Margin is 40 ÷ 100 = 40%; markup is 40 ÷ 60 = 66.67%. They are not interchangeable.
- 750 g for 3 vs 1 kg for 3.80
- The normalized prices are 4.00 per kg and 3.80 per kg. Compare only after converting quantities to the same unit.
Focused collection
Four calculators for percentages and prices
Open the tool that matches the question. Each destination keeps its own canonical URL, inputs and limitations.
General percentage
PercentCalc
Calculate percentages of values, ratios, increases, decreases and reverse percentages with a visible formula.
Sale price and savings
DiscountCalc
Calculate percentage or fixed discounts, stacked reductions and original prices without confusing savings with the amount paid.
Margin and markup
MarginCalc
Calculate profit, margin, markup or target selling price while keeping the denominator explicit.
Package comparison
UnitPrice
Normalize package sizes and multipacks to a shared unit price so like-for-like costs can be compared.
Reliable sequence
A four-step percentage and price check
- 1
Name the result
Decide whether you need a percentage amount, final discounted price, margin or comparable unit price.
- 2
Identify the base
Mark the original amount, cost, selling price or normalized quantity that belongs in the denominator.
- 3
Use the focused calculator
Enter the values with their currency or quantity units and retain the formula shown with the result.
- 4
Check the real total
Compare the result with the receipt, fees, taxes, package label or business policy before relying on it.
Common questions
Percentage and pricing calculation basics
Why does the base number matter in a percentage calculation?
A percentage is a fraction of a chosen whole. Forty is 40% of 100 but 66.67% of 60, so the same difference can produce different rates when the base changes.
Do two successive discounts add together?
Usually not. A 20% discount followed by 10% applies the second reduction to the already reduced price, giving a combined 28% reduction, not 30%.
Are margin and markup the same?
No. Margin divides profit by selling price; markup divides profit by cost. With cost 60 and price 100, margin is 40% and markup is 66.67%.
Is the lowest unit price always the best choice?
It is only a like-for-like price comparison. Quality, usable quantity, expiry, fees, taxes and personal or business constraints still need separate verification.
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