Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Your calculators
Discount Calculator — Percent Off, Coupons & Tax
Calculate checkout totals with stacked discounts, fixed coupons, quantity, tax, and shipping; find percent off, reverse an original price, or compare two deals.
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Volume Calculator — Cubic Feet, Gallons, Tanks & Materials
Calculate solid volume, tank and pool capacity, project material quantities, package cost, or a missing dimension with formulas, tables, and diagrams.
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Grade Calculator — Weighted Grades, Final Exam & GPA
Calculate weighted course grades, final exam targets, semester and cumulative GPA, or the GPA needed to reach a goal.
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Profit Calculator — Gross, Net Profit & Break-Even
Calculate gross, operating, pre-tax, and net profit, build a common-size P&L, find break-even and target sales, and compare reporting periods.
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ROI Calculator — Return, Annualized ROI & Payback
Calculate total and annualized ROI, model recurring project cash flow, find simple and discounted payback, compare scenarios, and review NPV.
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Margin Calculator — Profit, Markup & Target Price
Analyze gross margin, markup, net profit, fees, discounts, tax, overhead, break-even quantity, target prices, and pricing scenarios.
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Percentage Calculator - Change, Points & More
Calculate percentages, find a whole, compare percentage change and difference, measure percentage points, reverse a change, and compound successive rates.
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Fraction Calculator — Mixed Numbers, Steps & Visuals
Calculate, simplify, convert, compare, and order exact fractions; generate equivalents and LCD forms or explore an interactive fraction wall.
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Currency Converter - Rates, Fees & History
Convert 27 currencies with dated institutional rates, calculate the amount received after markup and fees, compare providers, and inspect historical trends.
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Inflation Calculator — See How Inflation Affects Your Money
Compare historical prices, purchasing power, salary changes, and future costs with U.S. CPI-U data from 1913 and clearly labeled projections through 2030.
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Scientific & Graphing Calculator — DEG/RAD, History & Memory
Evaluate safe scientific expressions with DEG or RAD mode, memory, history, result formatting, and an interactive graph for up to three functions.
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Compound Interest Calculator — Savings Growth & Goals
Project compound interest with monthly contributions, compare APR and APY, adjust for inflation, or calculate the monthly savings needed for a goal.
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