Percentage, Ratio & Finance Calculators
These calculators use straightforward arithmetic relationships but answer different practical questions: reducing ratios, finding a percentage, calculating discounts and tips, or separating markup from margin. Each page shows the exact formula it applies.
These calculators separate related ideas that are often confused, including percentage change, percentage increase, markup and margin. Use the visible formula on each page to confirm which base value is being used before applying a result to pricing, budgeting, reporting or another financial decision.
Key reference points
| Reference | Equivalent / method |
|---|---|
| 20% of 150 | 30 |
| 25% discount on 80 | 60 sale price |
| Cost 60 → sell 100 | 40% margin; 66.67% markup |
Percentage & Finance Formula Guide
Compare percentage, percentage change, discount, tip, markup, margin and ratio formulas with worked examples and links to calculators.
Read the reference guideTools in this topic
Ratio Calculator
Simplify a ratio, compare its parts, and see the decimal relationship between two non-zero values.
EverydayDiscount Calculator
Calculate the sale price and amount saved from an original price and percentage discount.
EverydayTip Calculator
Calculate a tip amount, total bill, and per-person share from a bill amount, tip percentage, and group size.
FinanceMarkup Calculator
Calculate selling price and markup amount from a cost and markup percentage, with the resulting gross margin shown for comparison.
FinanceMargin Calculator
Calculate gross profit, gross margin percentage, and markup percentage from cost and selling price.
MathPercentage Calculator
Solve common percentage questions: a percentage of a value, one value as a percentage of another, or the base value from a part and percentage.
MathPercentage Increase & Decrease Calculator
Apply a chosen percentage increase or decrease to an original value and see the change amount and resulting value.
MathPercentage Change Calculator
Calculate the percentage change from an old value to a new value and identify whether the result is an increase or decrease.
How Solveberry handles this topic
Each calculator keeps its formula visible, links to related calculations, and avoids separate reverse-direction pages. When regional definitions can change a result, the relevant standard is selected explicitly.