Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
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Paint Calculator — Gallons, Liters, Cans & Cost
Discount Calculator — Percent Off, Coupons & Tax
Adult BMI Calculator — BMI, Healthy Weight & Chart
Grade Calculator — Weighted Grades, Final Exam & GPA
Margin Calculator
Profit Calculator — Gross, Net Profit & Break-Even
ROI Calculator
Currency Converter - Rates, Fees & History
Fraction Calculator — Mixed Numbers, Steps & Visuals
Percentage Calculator - Change, Points & More
Mortgage Calculator — Payment, Affordability & Extra Savings
Car Loan Calculator — Payment, Budget, Payoff & Offers
Calculator descriptions
Paint Calculator — Gallons, Liters, Cans & Cost
Estimate paint for rooms, walls, and ceilings. Subtract doors and windows, set coats and coverage, and see gallons or liters, cans, leftover paint, and cost.
Discount Calculator — Percent Off, Coupons & Tax
Edit price, quantity, stacked discounts, coupons, tax and shipping beside a live checkout total, savings, effective discount, and per-item price.
Adult BMI Calculator — BMI, Healthy Weight & Chart
Calculate adult BMI in metric or US units. See the CDC category, healthy weight range for your height, distance to the range, formula, and a visual BMI chart.
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.
Margin Calculator
Analyze gross margin, markup, net profit, fees, discounts, tax, overhead, break-even quantity, target prices, and pricing scenarios.
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.
ROI Calculator
Calculate total and annualized ROI, model recurring project cash flow, find simple and discounted payback, compare scenarios, and review NPV.
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.
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.
Percentage Calculator - Change, Points & More
Choose a percentage question and edit its values beside a live answer, supporting change, difference, percentage points, reverse, and compound modes.
Mortgage Calculator — Payment, Affordability & Extra Savings
Edit home price, down payment, rate, taxes, insurance and fees beside a live monthly payment, affordability, cash-to-close and extra-payment plan.
Car Loan Calculator — Payment, Budget, Payoff & Offers
Calculate a car payment from the complete deal, reverse a monthly budget, test extra-payment payoff, compare two offers, or estimate a lease.
