Free Online Calculators

Calculate how much you can save with biweekly mortgage payments. See your amortization schedule and payoff date with accelerated biweekly payments.

Calculate your Home Equity Line of Credit (HELOC) payoff timeline. See how extra payments accelerate payoff and save interest on your HELOC balance.

Use the debt snowball method to pay off multiple debts. Compare snowball vs avalanche strategies and see your debt-free date.

Calculate how your savings grow with compound interest. See the power of compounding over time with detailed yearly breakdowns.

Calculate your path to Financial Independence and Early Retirement (FIRE). See when you can retire based on your savings rate, expenses, and investment returns.

Calculate exactly how much paint you need for any room. Enter wall dimensions, doors, and windows to get accurate paint gallon estimates and cost projections.

Estimate flooring materials and costs for hardwood, laminate, vinyl, or tile. Enter room dimensions and get square footage, material quantity, and total cost.

Calculate concrete volume for slabs, footings, columns, and stairs. Get cubic yards/meters and bag estimates for your DIY concrete project.

Plan your deck build with precise material estimates. Calculate deck boards, joists, fasteners, and total cost based on deck dimensions and board type.

Estimate fence materials including posts, rails, pickets, and concrete. Calculate total linear footage and project cost for your fence installation.

Calculate how much mulch, soil, or gravel you need for landscaping. Enter area dimensions and depth to get cubic yards and bag counts instantly.

Estimate wallpaper rolls needed for any room. Account for pattern repeat, doors, and windows. Get accurate roll counts and total project cost.

Calculate tiles needed for floors, walls, or backsplashes. Includes waste factor, grout estimation, and total material cost for any tile size.

Estimate roofing materials including shingles, underlayment, and flashing. Calculate roof area from dimensions and pitch for accurate material ordering.

Calculate how much sod or grass seed you need for your lawn. Get pallet counts, seed pounds, and total cost estimates for a lush new lawn.

Calculate gross margin, net margin, and markup percentages for your business. Enter revenue and costs to instantly see your profit margins and benchmark against industry averages.

Find your break-even point in units and dollars. Enter fixed costs, variable costs, and price per unit to see when your business becomes profitable.

Calculate your return on investment percentage, net gain, and annualized ROI. Perfect for evaluating business investments, marketing campaigns, and capital projects.

Calculate selling price from cost and markup percentage. Convert between markup and margin. Essential for retail pricing, wholesale, and ecommerce product pricing.

Calculate sale price, discount amount, and savings percentage. Enter original price and discount to see final price. Includes multi-tier discount stacking.

Calculate your ideal freelance hourly rate based on desired annual income, expenses, billable hours, and taxes. Perfect for freelancers, consultants, and contractors.

Calculate monthly payments, total interest, and amortization schedule for business loans. Compare SBA loans, term loans, and lines of credit with different rates and terms.

Calculate EBITDA from revenue and operating expenses. See EBITDA margin and understand your business's operating profitability before interest, taxes, depreciation, and amortization.

Calculate total price with sales tax. Enter pre-tax amount and tax rate to see tax amount and final total. Supports multi-state US tax rates and reverse tax calculation.

Calculate your take-home pay after federal tax, state tax, Social Security, and Medicare deductions. See gross-to-net breakdown and effective tax rate for any salary.

Calculate your Body Mass Index (BMI) from weight and height. See your BMI category (underweight, normal, overweight, obese) and the healthy weight range for your height.

Estimate how much water you should drink each day based on body weight, exercise, and climate. Get your daily hydration goal in liters and cups.

Calculate percentages instantly: what is P% of V, X is what % of Y, and X is P% of what. The fastest way to solve any percentage problem.

Calculate your exact age in years, months, and days. Also shows total months, weeks, and days between two dates — perfect for birthdays and anniversaries.

Convert units across length, weight, temperature, volume, area, time, speed, and digital storage. Fast, accurate conversions with live results.

Calculate your Basal Metabolic Rate with the Mifflin-St Jeor equation. See how many calories your body burns at rest based on weight, height, age, and sex.

Estimate your Total Daily Energy Expenditure from BMR and activity level. Get maintenance, cutting, and bulking calorie targets for any fitness goal.

Find your daily calorie target to reach a goal weight in a set timeframe. Works backward from your TDEE using the 7,700 kcal per kg rule.

Estimate body fat percentage from height, neck, waist, and hip measurements using the U.S. Navy formula. See your body fat category.

Estimate your one-rep max from any sub-max set using the Epley formula. Get a percentage load table for 95% down to 60% of your 1RM.

Calculate your max heart rate and five training zones using the Karvonen method. Personalize intensity by including your resting heart rate.

Add, subtract, multiply, and divide fractions, then simplify to lowest terms. Get both the reduced fraction and its decimal value instantly.

Solve any quadratic equation ax² + bx + c = 0. Shows the discriminant, root nature, and real or complex roots via the quadratic formula.

Compute combinations (nCr) and permutations (nPr) for any n and r. Perfect for probability, statistics, and combinatorics problems.

Find the missing side of a right triangle with a² + b² = c². Solve for the hypotenuse or a leg in seconds.

A full scientific calculator with arithmetic, powers, roots, percentages, parentheses, and trigonometry (sin, cos, tan, ln, log). Switch between degrees and radians.