Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Favorites
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.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate
Margin Calculator — Profit, Markup & Target Price
Analyze gross margin, markup, net profit, fees, discounts, tax, overhead, break-even quantity, target prices, and pricing scenarios.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate
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.
Calculate