All calculatorsMath & Percentages
Math & Percentage Calculators
Percentage calculator with five modes plus AI natural-language routing. Instant math results in your browser — free, no signup.
Math & Percentages tools
AI Calculator
Describe your calculation in plain English. AI extracts inputs and CalcVo computes the result.
Percentage Calculator
Calculate percentages five ways: percent-of, reverse, difference, increase, and decrease.
Discount Calculator
Calculate sale price after percent or dollar discounts, with optional stacked discounts and sales tax.
Margin Calculator
Calculate profit margin, markup percent, and profit from cost and selling price.
Markup Calculator
Calculate selling price, profit, and margin from cost and markup percentage.
Profit Margin Calculator
Analyze gross, operating, and net profit margins from revenue, COGS, and expenses.
ROI Calculator
Calculate return on investment as a percentage with optional annualized ROI and after-tax profit.
Break-Even Point Calculator
Find break-even units and revenue from fixed costs, variable cost per unit, and selling price.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions with mixed numbers and decimal equivalents.
Scientific Calculator
Evaluate scientific expressions with PEMDAS, trig, logs, roots, and degree or radian mode.
Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a dataset with population or sample mode.
Square Footage Calculator
Calculate room and floor area in square feet or square meters for rectangular and multi-room layouts.
Concrete Calculator
Estimate concrete volume for slabs, footings, and columns in cubic yards and bags needed.
Random Number Generator
Generate cryptographically strong random integers or decimals in a custom range.
Dice Roller
Roll standard RPG dice (d4–d20) or custom dice with quantity and modifiers.
Business & Pricing
Discounts, margins, markup, ROI, and break-even analysis for retailers and small business.
- Discount CalculatorSale price after percent or dollar discounts
- Margin CalculatorProfit margin and markup from cost and price
- Markup CalculatorSelling price from cost and markup percent
- Profit Margin CalculatorGross, operating, and net profit margins
- ROI CalculatorReturn on investment and annualized ROI
- Break-Even CalculatorUnits and revenue needed to cover costs