All calculators
99 free calculators, grouped by topic. Search by name or by what you need to figure out.
Time and Work Hours
Time CalculatorAdd and subtract durations in hours, minutes and seconds, and see the running total.Time Duration CalculatorFind the elapsed time between two times, or between two dates and times.Decimal Hours ConverterConvert between hours and minutes and decimal hours, with a printable minutes chart.Military Time ConverterConvert between 12-hour and 24-hour (military) time, with a chart you can print.
Time Cards and Timesheets
Time Card CalculatorEnter your clock-in and clock-out times for the week to total hours, split overtime and estimate gross pay.Hours CalculatorFind the hours between a start and end time, with unpaid breaks, for one shift or several.Timesheet CalculatorTotal a weekly or biweekly timesheet with split shifts, overtime for each workweek and a printable PDF.
Pay and Salary
Overtime CalculatorWork out overtime pay at time and a half for hours over 40 in a workweek, under federal rules.Hourly to Salary CalculatorConvert between hourly, weekly, biweekly, monthly and annual pay. Gross pay before taxes.Pay Raise CalculatorFind your new pay after a raise, or the percent raise between two pay amounts.Gross Pay CalculatorEstimate gross pay for a week or a two-week pay period from hours and an hourly rate.Commission CalculatorCalculate commission at a flat rate or with tiered rates, or find the sales needed for a commission goal.PTO Accrual CalculatorEstimate PTO earned each pay period and project your balance to a future date.
Dates and Business Days
Business Days CalculatorCount business days between two dates, or find the date a number of business days away.Days Between Dates CalculatorCount the days between two dates, with the answer in weeks, months and years too.Date CalculatorAdd or subtract days, weeks, months or years from any date.Age CalculatorFind an exact age in years, months and days, the next birthday, or the age gap between two people.Time Zone ConverterTurn a time in one zone into the same moment in up to six other zones, with the UTC offset and daylight saving status for that exact date.Unix Timestamp ConverterPaste a timestamp to see the date in UTC and in a zone you choose, or enter a date and time to get the timestamp.Day of the Week CalculatorPick a date to see which day of the week it falls on and where it sits in the year.Week Number CalculatorLook up the week number of a date, or the first and last day of a week number, using ISO or US numbering.Julian Date CalculatorGet the astronomical Julian Date for a moment in UTC, convert one back to a calendar date, or find the ordinal day of the year.
Percentages and Math
Percentage CalculatorFind a percent of a number, what percent one number is of another, or the whole from a part.Percent Change CalculatorCalculate the percent increase or decrease between two numbers, or the percent difference.Average CalculatorPaste a list of numbers for the mean, median, mode and range, or switch to a weighted average.Fraction to Decimal ConverterConvert fractions to decimals and decimals to fractions, with inch rounding and a chart.Ratio and Proportion CalculatorSolve proportions, simplify ratios and split a total by a ratio.GPA CalculatorEnter your courses, letter grades and credit hours to get a semester and cumulative GPA with the quality points shown.Fraction CalculatorAdd, subtract, multiply and divide fractions or mixed numbers with exact answers and the steps behind them.Scientific CalculatorType an expression or use the keypad. Trig, logs, roots, factorials, memory and a history of recent calculations.Standard Deviation CalculatorPaste a list of numbers for sample and population standard deviation, variance, mean and standard error.Grade CalculatorCalculate a weighted course grade, or the final exam score you need to reach the grade you want.Rounding CalculatorRound to decimal places, to the nearest ten or hundred, or to significant figures, and compare every rounding mode.Quadratic Equation SolverEnter a, b and c to get the roots, discriminant, vertex and factored form with the steps shown.Pythagorean Theorem CalculatorEnter two sides of a right triangle to find the third, along with area, perimeter and angles.GCF and LCM CalculatorEnter up to eight whole numbers for the GCF, LCM, prime factorizations and Euclid steps.Area CalculatorPick a shape and a unit to get its area, perimeter and the area in square feet, square meters and acres.Combinations and Permutations CalculatorEnter n and r for combinations and permutations, with or without repetition, as exact integers.
Business and Pricing
Profit Margin CalculatorFind profit margin from cost and price, or the price needed for a target margin, with markup shown alongside.Markup CalculatorFind the selling price from cost and markup, or the markup from cost and price.Discount CalculatorFind the sale price after a percent-off discount, with an optional stacked discount and sales tax.Sales Tax CalculatorAdd sales tax to a price, or work backward from a total to find the tax inside it.Break-Even CalculatorFind how many units you need to sell to cover your costs, and the sales needed for a profit target.
Everyday Utilities
Tip CalculatorCalculate the tip and split the bill between any number of people.Unit Price CalculatorCompare up to six products by price per ounce, pound, gram, liter or item.Fuel Cost CalculatorEstimate the fuel cost of a trip from distance, MPG and price, or work out your MPG.Unit ConverterConvert between units of length, mass, volume, temperature, area, speed, time, data and energy using exact definitions.Pace CalculatorSolve for pace, finish time or distance, with race presets, speed in mph and kph, and a split table.
Finance and Budgeting
Mortgage CalculatorEstimate your monthly mortgage payment, total interest and payoff time, with a full amortization schedule you can download.Loan CalculatorFind the monthly payment, total interest and payoff date for a fixed-rate loan, with an optional extra payment.Car Payment CalculatorEstimate your monthly car payment and the total cost of the loan, including sales tax on the price minus your trade-in.Compound Interest CalculatorSee how a balance grows with compound interest and optional recurring contributions, year by year.Savings CalculatorWork out how long a savings goal takes, what monthly deposit you need, or what your balance will be.Retirement Savings CalculatorProject your savings balance at retirement from your contributions and an assumed return, with an optional inflation adjustment.Simple Interest CalculatorCalculate simple interest on a principal for a number of years, months or days.ROI CalculatorCalculate the return on an investment as a percent, and as an annualized rate when you know how long you held it.Debt Payoff CalculatorCompare the snowball and avalanche methods for up to six debts and see which clears them faster or cheaper.Credit Card Payoff CalculatorFind how many months a payment takes to clear a card, or the payment needed to finish by a target.
Business and Freelancing
Invoice GeneratorFill in your business, your client and the work, watch the totals update, then download a PDF or print the invoice.Mileage Reimbursement CalculatorList each business trip, type the rate per mile you are using and get a line-by-line reimbursement total you can export.Freelance Rate CalculatorStart from the income you want to keep and see the hourly and day rate that gets you there, and how it moves when your billable time changes.Ad Metrics CalculatorPick the advertising metric you want and enter only the numbers it needs. The tool shows the formula with your values.
Home Improvement
Concrete CalculatorWork out how much concrete a slab, footing, wall, round column or set of steps needs, in cubic yards and in bags.Square Footage CalculatorMeasure any mix of rooms and shapes, subtract the parts you do not need, and get the total in square feet, yards and meters.Paint CalculatorEnter your walls, subtract doors and windows, and see how many gallons of paint to buy for the coats you plan.Mulch and Gravel CalculatorFind how much mulch, gravel, topsoil or sand covers your beds, in cubic yards, bags and tons.Roofing CalculatorEstimate roof area, squares and shingle bundles from the footprint, overhang and pitch of a simple gable or hip roof.Tile CalculatorCount the tiles and boxes for a floor, wall or backsplash, with the grout joint built into the tile spacing.Board Foot CalculatorList your boards, get board feet for every row and a total, and price the order at your cost per board foot.Flooring CalculatorTotal your rooms, add a waste allowance and see how many boxes of flooring and how much underlayment to buy.Drywall CalculatorAdd up walls and ceilings, deduct openings and see how many sheets to buy, plus rough fastener and compound estimates.Fence CalculatorEnter the length of your fence, gates and picket sizes to count posts, rails, pickets and post concrete.Deck CalculatorSize up the decking boards and joists for a rectangular deck from its dimensions, board width and gap.Paver CalculatorFind how many pavers a patio needs, plus the cubic yards of gravel base and bedding sand beneath them.Pool Volume CalculatorEstimate how many gallons and liters of water your pool holds from its shape, size and average depth.BTU CalculatorGet a rule-of-thumb BTU per hour and tonnage for a room. It is a starting point, not a professional load calculation.Electricity Cost CalculatorAdd your appliances and your own rate per kilowatt-hour to see what each one costs per month and per year.
PDF and Image Tools
Merge PDFCombine PDF files into one document, in the order you choose, without uploading anything.Image to PDF ConverterPut photos and scans into a single PDF, one image per page, with the page size and margins you want.Split PDF and Extract PagesPull the pages you need out of a PDF, or break it into smaller files, entirely on your device.Organize PDF PagesRotate, remove and reorder the pages of a PDF with thumbnails and keyboard-friendly buttons.PDF to Image ConverterTurn PDF pages into PNG or JPG images at the resolution you choose, right in your browser.Image ResizerSet an exact size in pixels or a percentage, then save the resized image as PNG, JPG or WebP.Image CompressorReduce the file size of photos with a quality setting you control and a live before and after comparison.Image Converter (JPG, PNG, WebP)Convert one image or a whole batch between JPG, PNG and WebP without sending files anywhere.Crop ImageCrop by dragging a box with handles or by typing exact pixel values, then save in the format you need.
Productivity and Utilities
Online StopwatchTime anything to the millisecond, record laps and splits, and export them. It keeps correct time in a background tab.Online Timer and CountdownStart a countdown for any length of time or count down to a clock time, with an alarm when it ends.Pomodoro TimerWork in focused blocks with timed breaks. Adjust the lengths, let it auto-start, and track sessions completed today.Random Number GeneratorPick random numbers between a minimum and maximum, with or without repeats, using your browser's secure random source.Word CounterPaste or type text to see live counts, reading time, speaking time and the most used words. Your text never leaves your browser.Case ConverterChange the capitalization of any text in one click, from title case to programming styles, then copy or download it.QR Code GeneratorMake a static QR code for a link, Wi-Fi login or contact card and download it as PNG or SVG. No tracking, no expiry.Password GeneratorGenerate random passwords or passphrases with a secure random source, and see how many bits of entropy they carry.Roman Numeral ConverterType a number or a Roman numeral and get the other form, with a clear explanation if the numeral is not valid.Random Name PickerDraw winners from a list or split a group into fair random teams. The names never leave your browser.
Work Schedules and Templates
Pay Period CalendarEnter your first pay date and frequency to get every pay date in the year, the number of pay periods and a CSV you can import.Timesheet Template GeneratorChoose the layout, add names and dates if you want them, and get a clean paper timesheet with blank lines for handwriting.Weekly Schedule MakerEnter shifts and unpaid breaks for each person and day, and the schedule totals the hours and flags anyone above 40.