Free Online Calculators
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Fast, accurate, and beautifully designed calculators for finance, health, business, technology, and everyday life. No sign-up. No ads blocking your results.
💰 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 →❤️ 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 →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 Zone Calculator
Calculate your target heart rate zones for exercise based on your age. Supports both standard and Karvonen methods for personalized training zones.
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 →📊 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 →💻 Technology Calculators
AI API costs, cloud computing, bandwidth, storage, and developer-focused calculators.
🔢 Everyday Calculators
Tip, split bill, unit conversion, age, and day-to-day calculators for common needs.
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 →Why CalcCenter?
Lightning Fast
Results calculate instantly as you type. No loading screens, no waiting. Built on cutting-edge web technology.
Shareable Results
Every calculation generates a unique URL. Share your exact inputs and results with anyone — just copy the link.
Modern Design
Clean, accessible, and mobile-first. Dark mode supported. No intrusive ads cluttering your calculations.