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Best Free Everyday Online Calculators

The calculators you actually use: percentages, tips, discounts, loans and mortgages, age and dates, BMI and everyday math. Each is a fast, focused page with no clutter, free and private in your browser, so you get the answer and move on. All 94 tools below are free, run in your browser, and need no sign-up.

BMI CalculatorCalculate your Body Mass Index in metric or imperial units and see your weight category instantly. Private, no sign-up.Percentage CalculatorWork out what X% of Y is, what percent one number is of another, and percentage increase or decrease instantly.Tip CalculatorCalculate the tip and split the bill between any number of people. Choose a tip percentage and see per-person totals instantly.Loan / EMI CalculatorCalculate your monthly payment, total interest and total repayment for any loan amount, rate and term instantly.Age CalculatorFind your exact age in years, months and days from your date of birth, plus total days, hours and your next birthday.Mortgage CalculatorEstimate your monthly home loan payment, total interest and payoff over the full term in seconds.Car / Auto Loan CalculatorEstimate your monthly auto payment from the vehicle price, down payment, trade-in, interest rate and loan term instantly.Compound Interest CalculatorSee how savings grow with regular contributions, compounding frequency, rate and time, plus interest earned instantly.Simple Interest CalculatorCompute interest and final balance from principal, annual rate and time using the classic I = P x r x t formula.Sales Tax CalculatorAdd sales tax to a price or work backwards from a tax-inclusive total to find the net amount and the tax portion.Discount / Sale Price CalculatorEnter an original price and a percent off to see the sale price and exactly how much money you save. Supports stacked discounts.Investment / Savings CalculatorProject the future value of an initial deposit plus recurring contributions at a given annual return over time.Retirement CalculatorEstimate your nest egg at retirement from your current savings, monthly contributions, expected return and years remaining.ROI CalculatorMeasure return on investment as a percentage and net profit from an initial cost and final value, with optional annualized ROI.VAT CalculatorAdd VAT to a net price or remove VAT from a gross price to find the net amount and the VAT portion at any rate you enter.Markup / Margin CalculatorFrom cost and price get profit, markup percent and gross margin percent, and see how the two differ clearly.Salary CalculatorConvert an hourly wage into weekly, monthly and annual pay, or go from a yearly salary back to an hourly rate instantly.Debt Payoff CalculatorSee how many months to clear a balance at a fixed monthly payment, the total interest paid and the true payoff time.Percentage Change CalculatorFind the percent increase or decrease between two numbers and the absolute difference, with the direction shown.Fraction CalculatorAdd, subtract, multiply or divide two fractions and get the answer reduced to lowest terms plus a decimal value instantly.Scientific CalculatorEvaluate expressions with trig, logarithms, exponents, square roots, pi and e, plus parentheses, all in your browser.Ratio CalculatorSimplify a ratio to its lowest terms and solve proportions by finding the missing value in an equivalent ratio instantly.Average / Mean CalculatorEnter a list of numbers to get the mean, median, mode, range, sum and count instantly, separated by commas or spaces.Standard Deviation CalculatorGet population and sample standard deviation, variance, mean and count from a list of numbers, computed instantly.Square Root CalculatorFind the square root of any number to high precision, plus the cube root, square and whether it is a perfect square.GCD / LCM CalculatorFind the greatest common divisor and least common multiple of two or more integers using the Euclidean algorithm instantly.Quadratic Equation SolverEnter a, b and c to solve ax squared plus bx plus c equals zero, with real or complex roots and the discriminant.Calorie / TDEE CalculatorEstimate your daily calorie needs from BMR and activity level, plus targets for cutting, maintaining or bulking.BMR CalculatorEstimate your basal metabolic rate, the calories your body burns at complete rest, using the accurate Mifflin-St Jeor equation.Body Fat Percentage CalculatorEstimate body fat percentage from simple tape measurements of neck, waist and hips instantly.Ideal Weight CalculatorEstimate a healthy target weight from your height and sex using the Devine, Robinson and Hamwi formulas plus a BMI range.Pregnancy Due Date CalculatorEstimate your due date from your last menstrual period using Naegele rule, plus current week and trimester.Date Difference CalculatorCount the days, weeks, months and years between two dates, with or without including the end date, instantly.Time Zone ConverterConvert a date and time from one time zone to another using your browser, with common cities and live daylight saving handling.Countdown Timer to a DateCount down to any future date and time and watch the days, hours, minutes and seconds tick down in real time in your browser.GPA CalculatorEnter each course grade and its credit hours to compute your grade point average on the standard 4.0 scale, with total credits shown.Final Grade CalculatorFind out exactly what score you need on your final exam to reach the overall course grade you are aiming for.Weighted Grade CalculatorCombine assignments, quizzes and exams with their own weights to find your overall course grade, computed instantly.Test Grade / Percentage CalculatorEnter the number of questions and how many were wrong or right to get your percentage score and letter grade instantly.Cumulative GPA CalculatorCombine your previous GPA and total credits with this term to find your new overall cumulative grade point average.Refinance CalculatorCompare your current loan payment against a new rate and term to see monthly savings, break-even point and lifetime interest.APR CalculatorInclude upfront fees in a loan to find the true annual percentage rate, so you can compare offers on an equal, honest basis.401k CalculatorProject your retirement balance from your salary, contribution percent, employer match and expected return over the years to retirement.Paycheck / Take-Home Pay CalculatorEstimate net pay per period after taxes and deductions using your own editable tax rate. No live tax lookup, fully private.Overtime Pay CalculatorWork out your total pay from regular and overtime hours at any overtime multiplier such as time-and-a-half or double time.Down Payment CalculatorFind your down payment amount and loan needed from a home price and percent down, or work backwards from savings you have.Net Worth CalculatorAdd up your assets and subtract your liabilities to see your total net worth, with a clear assets versus debts breakdown.Rent vs Buy CalculatorCompare the total cost of renting against buying a home over a set number of years to see which comes out cheaper.Credit Card Payoff CalculatorSee how long a card takes to clear at a fixed payment, the interest cost, and how a bigger payment saves you money.Water Intake CalculatorEstimate how much water to drink per day based on your body weight and exercise, shown in liters, ounces and cups.Macro CalculatorSplit your daily calories into grams of protein, carbs and fat for cutting, maintenance or bulking using your chosen ratio.Running Pace CalculatorEnter any two of distance, time and pace and it solves the third, for miles or kilometers, with a finish time projection.One Rep Max CalculatorEstimate your 1RM from a weight and reps using the Epley and Brzycki formulas, plus a full percentage training chart.Calories Burned CalculatorEstimate calories burned during an activity from your body weight, duration and the activity MET value, computed instantly.Gas / Fuel Cost CalculatorEstimate the fuel cost of a trip from distance, your vehicle fuel economy and the price you pay, plus cost per person.Electricity Cost CalculatorWork out what an appliance costs to run per hour, day, month and year from its wattage, usage and your price per kWh.Time Card CalculatorAdd up daily clock-in and clock-out times minus breaks to get total hours worked for the week, plus estimated gross pay.Debt-to-Income (DTI) CalculatorEnter your monthly debt payments and gross monthly income to get your DTI percent and a lender-style rating.CAGR CalculatorEnter a start value, end value and number of years to get the compound annual growth rate as a clean percentage instantly.Rule of 72 CalculatorEnter an annual return rate to estimate how many years it takes your money to double, or find the rate to double by a target.Dividend Yield CalculatorEnter the annual dividend per share and share price to get the yield percent, plus optional shares for annual income.Mortgage Payoff CalculatorSee how many months to clear your balance with extra payments, the total interest, and interest saved versus no extra.Car Affordability CalculatorEnter a monthly payment budget, loan rate, term and down payment to find the maximum car price you can afford.Freelance Hourly Rate CalculatorTurn your target income, billable hours, expenses and tax rate into the hourly rate you need to charge to hit your goal.Break-Even CalculatorEnter fixed costs, price per unit and variable cost per unit to find the break-even units and the revenue needed to cover costs.Profit Margin CalculatorEnter your cost and selling price to get profit, gross margin percent and markup percent, with the difference made clear.Savings Goal CalculatorEnter your target, current savings, monthly contribution and optional return to find how many months to reach your goal.Emergency Fund CalculatorEnter your monthly essential expenses, months of coverage and current savings to get your target fund and remaining gap.Days Until DateCount how many days are left until any future date. A live countdown showing days, weeks, hours and minutes remaining until your target day.Add Days to DateAdd a number of days, weeks, months or years to any date and get the exact resulting calendar date, including the day of the week.Subtract Days from DateSubtract days, weeks, months or years from any date to find a past calendar date, complete with the exact day of the week it falls on.Business Days CalculatorCount the working days between two dates, excluding weekends. See business days, total days, weekend days and full weeks in the range.Add Business Days to DateAdd a number of working days to a start date, skipping weekends, to find the resulting business date and the day of the week it lands on.ISO Week Number CalculatorFind the ISO 8601 week number for any date, plus the week year, the day of the week and the range of dates that week covers.Day of the Week FinderFind out what day of the week any date falls on, past or future. Enter a birthday or historic date and see the exact weekday instantly.Leap Year CheckerCheck whether any year is a leap year and see why. Lists the next several leap years and shows how many days that year has.Days in Month CalculatorSee how many days are in any month of any year, including February in leap years, plus the first and last weekday of that month.Time Duration CalculatorAdd or subtract times in hours, minutes and seconds. Combine multiple durations and get the total in HH:MM:SS and in decimal hours.World Time Zone ConverterConvert a time from one time zone to another using real IANA zones. Pick a date and time, choose two cities, and see the matching local time.Hours Worked CalculatorCalculate total hours worked from a clock in and clock out time, minus break minutes. Shows hours and minutes plus decimal hours for pay.Weekly Timesheet CalculatorAdd up hours across a full week from daily clock in and clock out times with breaks. See each day and the weekly total in decimal hours.Sleep Bedtime CalculatorFind the best times to go to sleep or wake up based on 90 minute sleep cycles, so you wake between cycles feeling more refreshed.Countdown to Date and TimeA live countdown to any date and time. Watch the days, hours, minutes and seconds tick down to a launch, event or deadline in real time.Time Lived CalculatorSee how long you have been alive in total days, hours, minutes and seconds from your birth date, updated live down to the second.Day of the Year CalculatorFind which numbered day of the year any date is, from 1 to 365 or 366, plus how many days are left in the year and the percentage elapsed.Next Birthday CountdownCount down to your next birthday. Enter your birth date to see the days until it, the weekday it falls on, and the age you will turn.Weekday Occurrence CounterCount how many times each weekday occurs between two dates. See exactly how many Mondays, Fridays or any weekday fall in your date range.Duration Between Two TimesWork out how long is between two clock times on the same day or overnight. Get the gap in hours and minutes and in decimal hours.Quarter of the Year FinderFind which fiscal quarter a date falls in. See the quarter number, its start and end dates, and how many days are left in that quarter.Moon Phase CalculatorFind the moon phase for any date. See the phase name, illumination percent and the moon age in days, computed from the lunar cycle.Date to Ordinal and Long FormatConvert a date into ordinal and long written formats. See the 1st, 2nd, 3rd style day, the full spelled out date and other common formats.Week of the Month FinderFind which week of the month a date falls in and which occurrence of that weekday it is, like the second Tuesday or the last Friday.Live Unix Time ClockA live clock showing the current Unix epoch time in seconds and milliseconds, plus the matching UTC and local date and time, updating each second.Time Ago CalculatorTurn a past date and time into a plain time ago phrase like 3 days ago or 5 months ago, plus the exact elapsed days, hours and minutes.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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