Free Online Tools

Calculate your exact age in years, months, weeks and days.

Convert a date and time between different time zones.

Generate a full year-by-year or month-by-month loan amortization schedule.

Compare your current mortgage against a refinance offer to see if it's worth it.

Calculate your monthly credit card interest charge and see how APR affects what you owe.

Calculate your debt-to-income ratio for loan and mortgage qualification.

Calculate the number of business days between two dates.

Calculate the monthly savings needed to reach a financial goal.

Create a signature image using stylish handwriting fonts.

Draw your signature with mouse or touch and download it.

Create a professional HTML email signature to paste into your email client.

Check if an email address is correctly formatted.

Add a diagonal text watermark to every page of a PDF.

Compare Avalanche vs Snowball strategies to pay off multiple debts.

Solve quadratic equations of the form ax² + bx + c = 0.

Rotate all pages in a PDF file.

Write Markdown and see a live rendered preview.

A scientific calculator with trigonometric and logarithmic functions.

Convert JPG or PNG images into a PDF document.

Calculate your monthly car loan payment and full amortization schedule.

Calculate how many units you need to sell to break even.

Calculate your target heart rate zones for exercise.

Calculate mean, variance and standard deviation from a data set.

Find and replace text, with optional regex support.

See how long it will take to pay off a credit card balance.

Calculate your daily calorie target to lose, maintain or gain weight.

Compare two blocks of text and highlight the differences.

Remove duplicate lines from a block of text.

Estimate your daily recommended water intake.

Estimate your due date and current pregnancy week.

Add, subtract, multiply or divide fractions.

Generate random UUID v4 identifiers.

Generate placeholder Lorem Ipsum text.

Calculate your monthly mortgage payment and full amortization schedule.

Convert between milliliters, liters, cups, gallons and more.

Convert between mph, km/h, m/s and knots.

Convert between square meters, square feet, acres and hectares.

Test regular expressions against sample text in real time.

Convert between hex color codes and RGB values, both directions.

Check WCAG contrast ratio between two colors for accessibility.

Generate complementary, triadic and analogous color harmonies.

Convert HSL color values to hex and RGB.

Convert PDF pages into JPG images.

Calculate percentages instantly.

Calculate simple interest on a principal amount.

Generate random numbers within a range.

Summarize long text into key points using AI.

Calculate return on investment.

Calculate selling price, profit and margin from cost and markup.

Convert between bits, bytes, KB, MB, GB and TB.

Encode or decode URL strings instantly.

Rewrite and rephrase text using AI.

Format, validate and minify JSON instantly.

Encode or decode Base64 text instantly.

Combine multiple PDF files into one.

Extract a page range from a PDF file.

Convert between world currencies using live exchange rates.

Reduce the file size of a PDF.

Calculate your BMI, BMI Prime, healthy weight range and Ponderal Index.

Calculate how your investment grows with compound interest.

Calculate tip amount and split the bill.

Calculate your daily calorie needs.

Count words, characters and sentences.

Convert text between upper, lower and title case.

Estimate your monthly and annual take-home pay.

Calculate sales tax and total price.

Estimate fuel cost for a trip.

Convert between mm, cm, m, km, inches, feet, yards and miles.

Convert between mg, g, kg, tonnes, ounces, pounds and stone.

Convert between Celsius, Fahrenheit and Kelvin.

Calculate the final price after two discounts applied in sequence.

See how extra monthly payments shorten your loan and save interest.

Generate strong, random passwords.

Calculate discounts instantly.

Calculate monthly loan EMI.

Calculate GST instantly.

Loan repayment calculator.

Find the difference between two dates.

Calculate your Grade Point Average from course grades and credit hours.

Estimate your ideal body weight based on height and gender.

Estimate body fat percentage using the U.S. Navy method.

See how inflation affects the value of money over time.

Calculate your net worth from total assets and liabilities.

Countdown to any event.

Calculate the maturity value of your monthly SIP investment.

Estimate your retirement savings corpus and future monthly income.

Calculate your daily protein intake target based on weight and activity level.

Calculate your Total Daily Energy Expenditure and maintenance macros.

Estimate your ovulation date and most fertile days.

Add a number of days to a date and find the resulting date.

Subtract a number of days from a date and find the resulting date.

Calculate the exact duration between two dates and times.

Find the ISO week number for any date.

Simplify a ratio to its lowest terms and see its decimal equivalent.

Find the least common multiple (and greatest common divisor) of a list of numbers.

Check if a number is prime and find its prime factorization.

Calculate the mean, median, mode and range of a data set.

Estimate the cubic yards and bags of concrete needed for a slab.

Calculate how many tiles you need for a floor or wall.

Estimate how many gallons of paint you need for a room.

Calculate how many boxes of flooring you need for a room.

Estimate roofing squares and shingle bundles needed for a roof.

Estimate the tons of gravel needed for a driveway or path.

Calculate network address, broadcast address, usable host range and more from an IP and subnet mask.

Convert a CIDR block into its first and last IP address.

Convert an IPv4 address between decimal, binary and hexadecimal.

Estimate the BTU rating needed to heat or cool a room.

Calculate your daily protein, carb and fat targets based on your diet style and goal.

Calculate the area of a rectangular, circular or triangular space.

Calculate the probability of one or two independent events.

Calculate mean, median, mode, standard deviation, quartiles and more from a data set.

Calculate how much a present sum plus monthly contributions will be worth in the future.

Calculate how much you'd need today to reach a future value goal.

Calculate the compound annual growth rate between a beginning and ending value.

Solve for the annual rate of return needed to reach a target balance, including monthly contributions.

Calculate the effective Annual Percentage Yield from a nominal interest rate and compounding frequency.

Estimate how long it takes an investment to double, or the rate needed to double it.

Calculate monthly car lease payments from price, residual value, money factor and tax.

Calculate student loan payments, including grace period interest capitalization.

Project your 401(k) balance at retirement, including employer match and salary growth.

Project your tax-free Roth IRA balance and see its advantage over a taxable account.

Calculate your FIRE number and how many years until you can retire early.

See what an old salary is worth today, and whether a raise actually outpaced inflation.

Project your savings account balance including monthly deposits and tax on interest earned.

Convert a pay rate at any frequency into its hourly, weekly, monthly and annual equivalents.

Calculate gross pay from an hourly rate, including regular and overtime hours.

Calculate sales commission, including an optional bonus rate above a quota threshold.

Estimate your lean body mass and fat mass from height and weight.

Calculate body surface area (BSA) using the Mosteller and DuBois formulas.

Calculate your waist-to-hip ratio and WHO-based health risk category.

Calculate your waist-to-height ratio, a simple screening measure for health risk.

Estimate body fat percentage using the military tape-test formula and check it against Army standards.

Estimate calories burned during exercise based on activity, weight and duration.

Calculate your personalized target heart rate range using the Karvonen method.

Estimate your one-rep max from a weight and rep count you can already lift.

Calculate your running pace and speed from a distance and finish time.

Calculate calories burned walking, with a MET value that adjusts to your actual pace.

Estimate blood alcohol concentration using the Widmark formula.

See the recommended pregnancy weight gain range based on your pre-pregnancy BMI.

Find your current pregnancy week and trimester from either your LMP or your due date.

Work backward from a due date to estimate your LMP, conception date and trimester start dates.

Estimate your fertile window using the calendar method, accounting for cycle-length variability.

Add, subtract, multiply, transpose or find the determinant of 2x2 and 3x3 matrices.

Find the greatest common factor of two or more numbers.

Break a number down into its prime factors, shown in exponent form.

Calculate the number of ways to arrange r items chosen from n, where order matters.

Calculate the number of ways to choose r items from n, where order doesn't matter.

Calculate binomial probability for exactly k successes, or k or fewer, across n trials.

Calculate a base raised to any exponent, including negative and fractional exponents.

Calculate the logarithm of a number to any base, including common and natural log.

Convert between standard decimal notation and scientific notation.

Calculate percent error between a measured value and an accepted (true) value.

Calculate the symmetric percentage difference between two values.

Calculate the average (mean) of a list of numbers.

Calculate the median (middle value) of a list of numbers.

Calculate how much mulch you need for a garden bed or landscaping area.

Calculate tons of asphalt needed for a driveway or paving project.

Calculate how many bricks and mortar bags you need for a wall.

Calculate how many concrete blocks (CMU) and mortar bags you need for a wall.

Calculate how many deck boards you need based on deck size and board spacing.

Calculate how many posts, rails and pickets you need for a fence.

Calculate how many rolls of wallpaper you need for a room.

Calculate pavers needed for a patio or walkway, plus sand and gravel base layers.

Calculate how many drywall sheets, plus joint compound and tape, you need.

Calculate bags of garden soil needed for a bed or container, by volume.

Calculate cubic yards and tons of bulk topsoil needed for a large area.

Calculate volume in cubic yards from length, width and height, in any units.

Calculate volume in cubic feet from length, width and height, in any units.

Calculate volume in cubic meters from length, width and height, in any units.

Calculate cement, sand and aggregate needed from a mix ratio.

Calculate cubic yards and weight of sand needed for a project.

Calculate gravel volume and weight for rectangular, circular or triangular areas.

Calculate rebar count, length and weight for a two-way reinforcement grid.

Estimate the allowable load on a simply supported rectangular beam.

Calculate the weight of steel flat bar, round bar, square bar or pipe.

Calculate board feet and cost for a lumber order.

Calculate fuel economy in MPG (US/UK), L/100km and km/L.

Calculate the cost to charge your electric vehicle.

Compare tire sizes and calculate speedometer difference.

Estimate how much your car's value will decline over time.

Calculate the maximum car price you can afford based on income.

Convert between pascals, bar, psi, atmospheres and torr.

Convert between joules, calories, watt-hours and BTU.

Convert between watts, kilowatts, horsepower and BTU/h.

Convert between newtons, pound-force, kilogram-force and dynes.

Convert between kg/m³, g/cm³, lb/ft³ and lb/gal.

Convert between newton-meters, pound-feet and pound-inches.

Convert between degrees, radians, gradians and arcminutes.

Convert between bps, Kbps, Mbps, Gbps and bytes per second.

Convert between hertz, kilohertz, megahertz, gigahertz and RPM.

Convert between sieverts, millisieverts, rem and millirem.

Convert between pascal-seconds, poise and centipoise.

Convert between L/min, GPM, CFM and cubic meters per second.

Count characters and track usage against a character limit.

Estimate how long it takes to read a piece of text.

Convert text into a clean, URL-friendly slug.

Sort the lines of a text block alphabetically or numerically.

Alphabetize a list of names, titles or items into A-Z order.

Remove blank lines from a block of text.

Collapse multiple spaces in text down to a single space.

Reverse text by character, word or line order.

Randomly shuffle text by character, word or line.

Encode text to HTML entities or decode HTML entities to text.

Validate a UUID and identify its version and variant.

Format and indent XML with proper structure.

Check whether XML is well-formed.

Convert CSV data into a JSON array of objects.

Convert a JSON array of objects into CSV data.

Format SQL queries with readable line breaks and indentation.

Decode a JWT's header and payload.

Generate a signed HS256 JWT from a JSON payload.

Generate MD5, SHA-1 and SHA-256 hashes of text.

Build a cron expression from simple schedule fields.

Convert between a Unix timestamp and a human-readable date.

Minify HTML by removing comments and unnecessary whitespace.

Format and indent minified or messy HTML.

Minify CSS by removing comments and unnecessary whitespace.

Format and indent minified or messy CSS.

Generate title, description and robots meta tags.

Generate a robots.txt file with allow/disallow rules.

Generate a sitemap.xml from a list of URLs.

Generate Open Graph meta tags for social sharing.

Generate Twitter/X Card meta tags for rich link previews.

Generate JSON-LD structured data for Article, Product, LocalBusiness or FAQPage.

Generate a canonical link tag and check for common issues.

Generate hreflang alternate link tags for multilingual pages.

Find the most frequent keywords and phrases in your text.

Preview how your page will look in Google search results.

Build a campaign tracking URL with UTM parameters.

Generate .htaccess, Nginx, HTML and JavaScript redirect code.

Resize an image to exact pixel dimensions.

Compress an image to reduce its file size.

Convert a WebP image to JPG.

Convert a JPG image to WebP.

Clean up and shrink SVG markup.

Strip EXIF, GPS and other metadata from an image.

View EXIF metadata embedded in a JPEG photo.

Calculate net profit and profit margin from revenue and expenses.

Calculate gross profit and gross margin from revenue and cost of goods sold.

Calculate EBITDA from net income, interest, taxes, depreciation and amortization.

Calculate how many times inventory is sold and replaced over a period.

Calculate days inventory outstanding (DIO), how long inventory sits before it sells.

Calculate working capital and current ratio from current assets and liabilities.

Calculate net cash flow from operating, investing and financing activities.

Calculate an invoice's due date from the invoice date and payment terms.

Estimate a business's value using the earnings-multiple method.

Calculate your cumulative GPA across multiple semesters.

Calculate the score you need on your final exam to reach a target grade.

Convert marks obtained into a percentage and letter grade.

Calculate your attendance percentage and how many classes you can miss or need to attend.

Calculate how many hours a day you need to study before your exam.

Calculate how much house you can afford based on income and debts.

Calculate how much rent you can afford based on your income.

Calculate cash flow, cap rate and cash-on-cash return for a rental property.

Calculate the true APR of a loan including fees and points.

Calculate your available home equity and monthly loan payment.

Calculate your down payment amount and resulting loan amount.

Calculate the maturity value and interest earned on a certificate of deposit.

Calculate how long it takes an investment to pay for itself.

Project your tax-deferred Traditional IRA balance and tax savings.

Calculate your Required Minimum Distribution from a retirement account.

See how consolidating multiple debts into one loan affects your monthly payment.

Project future college costs based on today's cost and years until enrollment.

Add or remove VAT from a price.

Calculate asset depreciation using straight-line or declining balance methods.

Calculate required margin and buying power for a leveraged trading position.

Calculate a recommended budget using the 50/30/20 rule.

Calculate the future value of a series of regular annuity payments.

Calculate the regular payout a lump sum can provide over a set period.

A simple online stopwatch with start, pause, reset and lap timing.

Calculate the elapsed business hours between two dates within a working-hours window.

Calculate hours worked in a single shift from clock-in and clock-out times, minus breaks.

Total up hours worked across a week from daily clock-in/out times, with overtime and pay.

Calculate the exact age gap between two people's birth dates.

Find your healthy weight range based on the standard BMI range for your height.

Forecast your next several expected period dates based on your cycle.

Estimate your likely conception date and window from a known or expected due date.

Estimate glomerular filtration rate (eGFR) and kidney function stage from serum creatinine.

Estimate your recommended daily fat intake range from your calorie target.

Estimate your recommended daily carbohydrate intake range from your calorie target.

Estimate your body frame size (small, medium or large) from height and wrist circumference.

Calculate a triangle's area, perimeter and angles from its three side lengths.

Calculate a circle's diameter, circumference and area from its radius.

Calculate the straight-line distance and midpoint between two coordinate points.

Calculate the nth root of a number, including square roots and cube roots.

Calculate the slope, y-intercept and equation of a line through two points.

Calculate a z-score and percentile from a value, mean and standard deviation.

Calculate a confidence interval and margin of error from a sample mean and standard deviation.

Find the nth term and sum of an arithmetic or geometric sequence.

List all the factors (divisors) of a whole number.

Calculate the survey sample size needed for a target confidence level and margin of error.

Calculate the remaining amount of a substance after a period of exponential decay.

Add, subtract, multiply, divide or raise to a power very large whole numbers with full precision.

Round a number to a chosen number of decimal places, up, down or to the nearest value.

Estimate your bra size from bust and band measurements, with US, UK, EU and AU conversions.

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Convert numbers to Roman numerals, or Roman numerals back to numbers.

Calculate the number of steps, riser height, run and stringer length for a staircase.

Calculate voltage drop across a wire run from current, length and wire gauge.

Solve for voltage, current or resistance from the other two, plus power.

Estimate the electricity usage and cost of running an appliance.

Calculate how long a file will take to download or upload at a given connection speed.

Solve for mass, volume or density from the other two values.

Calculate the molarity of a solution from the solute's mass, molar mass and solution volume.

Estimate engine horsepower from a quarter-mile trap speed or elapsed time.