Free Online Calculators for
Finance, Health & Business
Fast, accurate, and beautifully designed calculators for finance, health, business, technology, and everyday life. No sign-up. No ads blocking your results.
Most Popular
Our most-used calculators across all categories.
Mortgage Payment Calculator
Calculate your monthly mortgage payment, total interest, and overall cost of a home loan based on price, down payment, interest rate, and loan term.
Calculate →Tax Refund Calculator 2026
Estimate your 2026 tax refund or amount owed. Enter your income, withholdings, deductions, and credits to see your estimated refund. Free and accurate tax calculator.
Calculate →Body Mass Index (BMI) Calculator
Calculate your Body Mass Index (BMI) to assess whether your weight falls within a healthy range based on your height and weight.
Calculate →Compound Interest Calculator
Calculate how your investments grow over time with compound interest. See the power of compounding with regular monthly contributions and different compounding frequencies.
Calculate →Salary Calculator
Convert your annual salary to hourly, weekly, biweekly, and monthly pay. Estimate take-home pay after federal and state taxes with adjustable tax rates.
Calculate →Daily Calorie Needs Calculator
Estimate your daily calorie needs using the Mifflin-St Jeor equation. Find your BMR, maintenance calories, and targets for weight loss or gain.
Calculate →💰 Financial Calculators
Mortgage, loan, investment, retirement, and savings calculators to help you make smarter financial decisions.
Mortgage Payment Calculator
Calculate your monthly mortgage payment, total interest, and overall cost of a home loan based on price, down payment, interest rate, and loan term.
Calculate →Compound Interest Calculator
Calculate how your investments grow over time with compound interest. See the power of compounding with regular monthly contributions and different compounding frequencies.
Calculate →Loan Payoff Calculator
Find out how long it will take to pay off your loan and how much interest you will pay. Enter your balance, interest rate, and monthly payment to see your payoff timeline.
Calculate →FIRE Calculator - Financial Independence, Retire Early
Calculate your path to Financial Independence and Early Retirement. Determine your FIRE number, projected savings, and how many years until you can retire based on your savings rate and expenses.
Calculate →Salary Calculator
Convert your annual salary to hourly, weekly, biweekly, and monthly pay. Estimate take-home pay after federal and state taxes with adjustable tax rates.
Calculate →Savings Calculator
Calculate how your savings grow over time with compound interest. See future value, total contributions, and interest earned with adjustable compounding frequency and monthly deposits.
Calculate →Paycheck Calculator - Take Home Pay Estimator
Calculate your take-home pay after federal tax, state tax, FICA, 401k contributions, and health insurance deductions. Estimate your net pay per paycheck.
Calculate →401(k) Retirement Calculator
Estimate your 401(k) balance at retirement with employer matching, salary growth, and compound investment returns. See total contributions, growth, and projected monthly income.
Calculate →Rent vs Buy Calculator
Compare the total cost of renting versus buying a home over time. See monthly mortgage payments, equity built, and whether renting or buying is the better financial decision for your situation.
Calculate →Investment Return Calculator
Calculate the future value of your investments with compound growth, monthly contributions, inflation adjustment, and capital gains tax. See nominal, real, and after-tax returns.
Calculate →Credit Card Payoff Calculator
Calculate how long it will take to pay off your credit card balance and how much interest you will pay. Enter your balance, APR, and monthly payment to see your debt-free date.
Calculate →Retirement Calculator
Calculate how much you need to save for retirement based on your current age, savings, monthly contributions, expected returns, and desired retirement income.
Calculate →Income Tax Calculator
Estimate your federal income tax liability based on your gross income, filing status, deductions, and number of dependents using 2025 US federal tax brackets.
Calculate →Inflation Calculator
Calculate how inflation erodes purchasing power over time. See the future cost of goods and how much value your money loses at a given inflation rate.
Calculate →Auto Loan Calculator
Calculate your monthly car payment, total interest, and overall cost of an auto loan based on vehicle price, down payment, trade-in value, interest rate, and loan term.
Calculate →Tax Refund Calculator 2026
Estimate your 2026 tax refund or amount owed. Enter your income, withholdings, deductions, and credits to see your estimated refund. Free and accurate tax calculator.
Calculate →FAFSA SAI Calculator 2026-2027
Estimate your Student Aid Index (SAI) for the 2026-2027 FAFSA. Input income, assets, and family size to plan your college financial aid using the updated SAI methodology.
Calculate →Capital Gains Tax Calculator 2026
Calculate short-term and long-term capital gains taxes for 2026. Enter your purchase price, sale price, and holding period. Free capital gains estimator.
Calculate →Student Loan Interest Calculator
Calculate total interest paid on student loans. Compare federal and private loan costs, see amortization schedules, and plan your repayment strategy.
Calculate →Debt-to-Income Ratio Calculator
Calculate your debt-to-income ratio for mortgage qualification and financial health assessment. See how lenders view your creditworthiness and get qualification recommendations.
Calculate →Net Worth Calculator
Calculate your total net worth by summing assets and subtracting liabilities. Track your financial health with comprehensive asset and debt tracking.
Calculate →Dividend Calculator
Calculate dividend income and portfolio growth with and without dividend reinvestment (DRIP). See how dividends compound over time with projections and detailed analysis.
Calculate →APY Calculator
Calculate Annual Percentage Yield (APY) and project savings growth with regular deposits. Compare compounding frequencies and see the true annual return on your savings.
Calculate →Car Affordability Calculator
Calculate the maximum car price you can afford based on monthly budget, down payment, and loan terms. See total loan cost, monthly payments, and debt-to-income impact.
Calculate →Home Equity Calculator
Calculate your home equity, loan-to-value (LTV) ratio, available HELOC, and projected equity growth. Understand how much of your home you own.
Calculate →Debt Payoff Planner
Plan your debt payoff using the snowball or avalanche method. Calculate months to debt freedom, total interest paid, and see how extra payments accelerate your timeline.
Calculate →US Tariff & Import Duty Calculator
Estimate US import tariffs, customs duties, and total landed cost by country and product type. Updated for 2026 tariff rates including Section 122 and Section 232.
Calculate →Car Payment Calculator
Calculate your monthly car payment, total interest, sales tax, and overall vehicle cost based on price, down payment, trade-in value, interest rate, loan term, and sales tax rate.
Calculate →Amortization Schedule Calculator
Generate a detailed loan amortization schedule showing how each monthly payment splits between principal and interest. See your payoff date, total interest, and savings from extra payments.
Calculate →50/30/20 Budget Calculator
Use the 50/30/20 rule to create a balanced budget. Enter your monthly income and see exactly how much to allocate toward needs, wants, and savings or debt repayment.
Calculate →Refinance Calculator
Calculate your mortgage refinance savings, break-even point, and determine if refinancing makes financial sense with this comprehensive refinance calculator.
Calculate →Savings Goal Calculator
Calculate how much to save each month to reach your savings goal. Plan for emergency funds, down payments, vacations, or any financial target with interest growth.
Calculate →Mortgage Affordability Calculator
Determine the maximum home price and loan amount you can afford based on your income, debts, down payment, and interest rate using lending ratios.
Calculate →Loan Comparison Calculator
Compare two loans side-by-side. Calculate monthly payments, total costs, and total interest to determine which loan option saves you money.
Calculate →Stamp Duty Calculator
Calculate UK stamp duty on property purchases. Estimate tax for England, Scotland, and Wales with first-time buyer and investor considerations.
Calculate →OBBBA Tax Calculator 2026
Calculate your tax savings under the One Big Beautiful Bill Act (OBBBA). Compare your taxes under the old law vs. the new 2026 tax provisions including no tax on tips, overtime tax exemption, increased child tax credit, and higher SALT cap.
Calculate →❤️ Health & Fitness Calculators
BMI, calorie, macro, body fat, and wellness calculators to track your health goals.
Body Mass Index (BMI) Calculator
Calculate your Body Mass Index (BMI) to assess whether your weight falls within a healthy range based on your height and weight.
Calculate →Daily Calorie Needs Calculator
Estimate your daily calorie needs using the Mifflin-St Jeor equation. Find your BMR, maintenance calories, and targets for weight loss or gain.
Calculate →Body Fat Percentage Calculator (Navy Method)
Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat, lean mass, fat mass, and body fat category.
Calculate →Pregnancy Due Date Calculator
Calculate your estimated due date based on your last menstrual period using Naegele's rule. See how many weeks pregnant you are, your current trimester, and days remaining until delivery.
Calculate →Total Daily Energy Expenditure (TDEE) Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Find out how many calories you burn per day.
Calculate →Calorie Deficit Calculator
Calculate your calorie deficit for weight loss using the Mifflin-St Jeor equation. Find your daily calorie target and estimated time to reach your goal weight.
Calculate →Macronutrient Calculator
Calculate your ideal daily macronutrient breakdown for protein, carbs, and fat based on your calorie target and fitness goals.
Calculate →Daily Water Intake Calculator
Calculate how much water you should drink per day based on your body weight, activity level, climate, and exercise habits.
Calculate →Heart Rate Zones Calculator
Calculate your 5 heart rate training zones based on age and resting heart rate. Find your Zone 2 fat burning range, cardio zone, and max effort zone using standard or Karvonen methods.
Calculate →Ideal Body Weight Calculator
Calculate your ideal body weight using four evidence-based formulas: Devine, Robinson, Miller, and Hamwi. Includes healthy BMI weight range.
Calculate →Calories Burned Calculator
Estimate calories burned during activities based on weight, activity type, duration, and intensity. Use MET values to calculate energy expenditure for various exercises.
Calculate →Weight Loss Calculator
Calculate how long to reach your target weight based on your calorie deficit and activity level. Uses the Mifflin-St Jeor formula to calculate TDEE and project weight loss timeline.
Calculate →Sleep Calculator
Calculate optimal sleep and wake times based on sleep cycles. Find the best time to go to bed or wake up to complete full sleep cycles.
Calculate →Protein Requirement Calculator
Calculate your daily protein requirements based on your weight, age, gender, activity level, and fitness goals. Get personalized protein targets for muscle building, fat loss, or maintenance.
Calculate →Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI and gestational week using IOM guidelines. Get personalized targets for single and multiple pregnancies.
Calculate →Running Pace Calculator
Calculate your running pace per mile or kilometer, projected finish times for 5K, 10K, half marathon, and full marathon races.
Calculate →One Rep Max (1RM) Calculator
Estimate your one rep max (1RM) using the Epley formula. Calculate training percentages and determine appropriate weights for strength training programs.
Calculate →BMR Calculator
Calculate your Basal Metabolic Rate (BMR) and daily calorie needs based on your age, gender, weight, and height using the Mifflin-St Jeor formula.
Calculate →Ovulation Calculator
Calculate your ovulation date and fertile window based on your menstrual cycle. Determine when you are most fertile for family planning or contraception tracking.
Calculate →📊 Business Calculators
Break-even, markup, margin, ROI, and employee cost calculators for smarter business decisions.
Markup & Margin Calculator
Calculate markup percentage, gross margin, and profit per unit. Enter cost and selling price, or cost and markup percentage, to see a full breakdown.
Calculate →Freelancer Hourly Rate Calculator
Calculate the hourly rate you need to charge as a freelancer to meet your income goals. Factor in business expenses, time off, and billable hours to find your ideal rate.
Calculate →ROI Calculator
Calculate your return on investment including ROI percentage, profit or loss, annualized ROI, and monthly equivalent return. Enter your initial investment and final value to see a full breakdown.
Calculate →Break-Even Calculator
Calculate your break-even point in units and revenue. Enter your fixed costs, variable cost per unit, and selling price to find out how many units you need to sell to cover all costs.
Calculate →Profit Margin Calculator
Calculate gross profit, gross margin percentage, net profit, net margin percentage, and markup. Understand your business profitability with a complete margin analysis.
Calculate →Sales Tax Calculator
Calculate sales tax for any US state. Enter the price and tax rate to find the total cost, or reverse calculate the pre-tax price from a total amount.
Calculate →Employee Cost Calculator
Calculate the true cost of hiring an employee including salary, benefits, taxes, and overhead. Understand the real cost beyond just the base salary.
Calculate →💻 Technology Calculators
AI API costs, cloud computing, bandwidth, storage, and developer-focused calculators.
AI API Cost Calculator 2026
Estimate the cost of using AI APIs from OpenAI, Anthropic, Google, and xAI. Calculate per-request, daily, monthly, and annual costs for GPT-5, Claude 4.6, Gemini 3, and Grok models based on token usage.
Calculate →Cloud Compute Cost Calculator
Estimate your monthly and annual cloud computing costs. Calculate expenses for compute instances, storage, and data transfer across AWS, GCP, and Azure.
Calculate →Password Strength Calculator
Check how strong your password is and estimate how long it would take to crack. Calculate password entropy and get security recommendations.
Calculate →Download Time Calculator
Calculate how long it will take to download a file based on your internet speed. Supports all file sizes and connection types.
Calculate →Data Storage Converter
Convert between data storage units instantly. Convert bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes with both binary and decimal standards.
Calculate →Bandwidth Calculator
Calculate the bandwidth you need for streaming, video calls, gaming, and more. Estimate total household bandwidth requirements based on connected devices and activities.
Calculate →Home Theater Viewing & Speaker Distance Calculator
Calculate the optimal TV viewing distance, ideal screen size, and speaker placement for your home theater setup. Based on THX, SMPTE, and Dolby recommendations.
Calculate →Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses, and usable host ranges from an IP address and CIDR notation.
Calculate →🔢 Everyday Calculators
Tip, split bill, unit conversion, age, and day-to-day calculators for common needs.
Car Lease vs Buy Calculator
Compare the total cost of leasing a car versus buying one. See monthly payments, total expenses, and determine which option saves you the most money based on your driving habits and timeline.
Calculate →Tip Calculator
Quickly calculate tip amounts, total bills, and per-person splits. Adjust the tip percentage with a slider and divide the bill among any number of people.
Calculate →Percentage Calculator
Calculate percentages instantly. Find what percent one number is of another, compute percentage of a value, or determine the percentage change between two numbers.
Calculate →Age Calculator
Calculate your exact age in years, months, and days from your date of birth. See total days and weeks lived, and compute age on any target date.
Calculate →GPA Calculator
Calculate your semester and cumulative GPA. Enter up to four course grades and credit hours to see your grade point average, quality points, and Dean's List eligibility.
Calculate →Date Calculator - Days Between Two Dates
Calculate the number of days, weeks, months, and years between two dates. Find business days, remaining days, and more with this free date calculator.
Calculate →Discount Calculator
Calculate the sale price after a discount, including support for stacked discounts and sales tax. Enter the original price, discount percentage, and optional second discount to see your total savings.
Calculate →Percentage Change Calculator
Calculate the percentage increase or decrease between two values. Perfect for tracking price changes, growth rates, and comparing metrics over time.
Calculate →Hours Calculator
Calculate total hours and minutes between two times. Perfect for tracking work shifts, overnight hours, project duration, and time tracking. Handles overnight shifts automatically.
Calculate →Gas Cost Calculator
Calculate the cost of fuel for your trip or commute. Enter distance, fuel efficiency, and gas price to see total fuel costs and per-mile expenses.
Calculate →Paint Calculator
Calculate how much paint you need for your room. Enter room dimensions, openings, and number of coats to determine gallons and cans required.
Calculate →Random Number Generator
Generate random numbers within a custom range. Specify minimum and maximum values, quantity, and whether duplicates are allowed.
Calculate →Electricity Cost Calculator
Calculate the cost of running electrical appliances and devices. Enter wattage, daily hours of use, and your electricity rate to see daily, monthly, and yearly costs.
Calculate →Square Footage Calculator
Calculate the area of a space in square feet, meters, yards, and acres. Supports rectangles, circles, and triangles for accurate measurements.
Calculate →Currency Converter Calculator
Convert between major world currencies instantly. Use fixed exchange rates based on USD to quickly convert amounts for travel, business, or reference.
Calculate →Hourly to Salary Calculator
Convert your hourly wage to an annual salary, monthly income, biweekly paycheck, and more. Factor in overtime hours and paid time off for accurate results.
Calculate →Fraction Calculator
Calculate operations with fractions instantly. Add, subtract, multiply, or divide fractions and get simplified results with decimal conversions.
Calculate →Grade Calculator
Calculate what grade you need on your final exam to achieve your desired class grade. See how your current grade, final exam weight, and desired grade affect your final outcome.
Calculate →Probability Calculator
Calculate probability of events. Find the probability of combined events, independent events, mutually exclusive events, and conditional probability.
Calculate →Split Bill Calculator
Easily split restaurant bills, shared expenses, or group costs among multiple people with tip calculation. Calculate each person's share instantly.
Calculate →Unit Converter
Convert between metric and imperial units. Convert length, weight, temperature, volume, and speed measurements instantly.
Calculate →Wedding Budget Calculator
Plan your wedding budget by allocating funds across venue, catering, photography, flowers, music, and other categories. Calculate cost per guest and get region-adjusted recommendations.
Calculate →Time Zone Converter
Convert time between different time zones instantly. Calculate time differences and find what time it is in any time zone around the world.
Calculate →Concrete Calculator
Calculate how much concrete you need for driveways, patios, slabs, and other projects. Get estimates in cubic feet, cubic yards, bags, and cost.
Calculate →Typing Speed Calculator
Calculate your typing speed in words per minute (WPM), net WPM, accuracy percentage, and error rate. Measure and improve your typing skills.
Calculate →Scientific Notation Converter
Convert large numbers to scientific notation and engineering notation instantly. See the coefficient, exponent, and standard forms of any number.
Calculate →Dog Age Calculator
Convert your dog's age to human years using the modern formula that accounts for breed size and development stages.
Calculate →Fuel Economy Calculator (MPG)
Calculate your vehicle's fuel economy in MPG and determine the cost per mile and trip cost. Compare efficiency metrics in imperial and metric units.
Calculate →Pool Volume Calculator
Calculate the volume of your swimming pool in gallons, liters, or cubic feet. Enter the pool shape and dimensions to determine how much water and chemicals you need.
Calculate →Quadratic Formula Solver
Solve any quadratic equation using the quadratic formula. Enter the coefficients a, b, and c to find the roots and analyze the parabola vertex.
Calculate →Shoe Size Converter
Convert shoe sizes between US, UK, and EU systems. Find your size in different countries and shoe length in centimeters.
Calculate →Snow Day Calculator
Will there be a snow day tomorrow? Get a fun probability prediction based on temperature, snowfall, wind speed, and school type.
Calculate →📝 Latest Guides & Articles
In-depth guides to help you make smarter financial decisions with our calculators.
OBBBA Tax Calculator 2026: How the One Big Beautiful Bill Affects Your Taxes
The One Big Beautiful Bill Act changes taxes for nearly every American. Learn how the OBBBA affects your bottom line and calculate your personal savings with our free calculator.
Read More →Amortization Schedule Explained: How Your Loan Payments Really Work in 2026
Learn how amortization schedules determine where every dollar of your loan payment goes. Includes the formula, worked examples, and strategies to save thousands by paying off your loan faster.
Read More →The 50/30/20 Budget Rule Explained: How to Budget Your Money in 2026
Discover the 50/30/20 rule—a proven budgeting method to allocate 50% to needs, 30% to wants, and 20% to savings. Learn how to apply it to your life with real examples.
Read More →Why CalcCenter?
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