YOUR EVERYDAY TOOLKIT

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Simple Interest Calculator

Find interest earned on a fixed principal without compounding.

Tip Calculator

Calculate a tip and split the total evenly between people.

Hourly to Salary Calculator

Estimate annual gross pay from hourly rate, weekly hours and paid weeks.

Fraction Calculator

Add, subtract, multiply or divide two fractions and simplify the exact result.

GCD and LCM Calculator

Find the greatest common divisor and least common multiple of two whole numbers.

Circle Area Calculator

Calculate circle area, circumference and diameter from its radius.

Quadratic Formula Calculator

Solve ax² + bx + c = 0 for real or complex roots.

Standard Deviation Calculator

Measure spread in a list of numbers using sample or population standard deviation.

Area Converter

Convert square meters, square feet, acres, hectares and other area units.

Volume Converter

Convert liters, milliliters, cubic meters and explicitly labeled US or imperial volumes.

Speed Converter

Convert between kilometers per hour, miles per hour, meters per second and knots.

Data Storage Converter

Convert bytes, bits and decimal or binary storage units without confusing MB and MiB.

Date Addition Calculator

Add or subtract whole calendar days from a date and find the resulting weekday.

Time Duration Calculator

Find elapsed wall-clock hours and minutes between two times, including an overnight interval.

Sort Text Lines

Sort a list of lines in ascending or descending case-sensitive order.

Whitespace Cleaner

Collapse repeated whitespace and remove spaces from the beginning and end of text.

Dice Roller

Roll one or more dice with a chosen number of sides and see each roll and the total.

List Shuffler

Randomly reorder a list while keeping all nonempty entries, including duplicates.

Customer Acquisition Cost Calculator

Combine sales and marketing costs to estimate the average cost of acquiring a new customer.

CPC Calculator

Calculate average cost per click from advertising spend and recorded clicks.

CPM Calculator

Find advertising cost per thousand impressions from total spend and impressions.

CPA Calculator

Calculate the average advertising cost for a recorded conversion action.

Conversion Rate Calculator

Measure conversions as a percentage of eligible interactions, clicks or sessions.

ROI Calculator

Compare net proceeds with your initial investment to calculate a simple return on investment.

Revenue Growth Calculator

Find annualized revenue growth and total change between comparable reporting periods.

Markup Calculator

Set a selling price from unit cost and your desired percentage markup.

Compound Interest Calculator

See how your starting balance and regular contributions could grow with monthly compounding.

Mortgage Calculator

Estimate monthly principal and interest payments and see your balance fall over time.

Discount Calculator

Find a sale price and exactly how much you save before taxes or fees.

Profit Margin Calculator

Turn revenue and cost into profit margin, profit, and markup.

ROAS Calculator

Measure attributed revenue for every unit of advertising spend.

Break-Even Calculator

Find the whole units you must sell to cover fixed and variable costs.

Percentage Calculator

Calculate any percentage of a number, including decimals and negative values.

Percentage Change Calculator

Compare an original and new value to find the relative increase or decrease.

Average Calculator

Calculate the mean, median, sum and range of a list of numbers.

BMI Calculator

Calculate adult body mass index from metric height and weight.

Running Pace Calculator

Find your minutes per kilometer and speed from a distance and finish time.

BMR Calculator

Estimate resting energy expenditure with the Mifflin–St Jeor equation.

Age Calculator

Find completed years of age and total elapsed calendar days between two dates.

Date Difference Calculator

Count the days and full weeks between two calendar dates.

Business Days Calculator

Count Monday-to-Friday weekdays between two dates, excluding the end date.

Length Converter

Convert meters, kilometers, feet, inches, miles and other common length units.

Weight Converter

Convert mass between kilograms, grams, pounds and ounces.

Temperature Converter

Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.

Word Counter

Count words and characters instantly, with an approximate reading time.

Case Converter

Change text to uppercase, lowercase or simple English title case.

Duplicate Line Remover

Remove repeated lines while preserving the order of their first appearance.

Random Number Generator

Pick a random whole number from an inclusive range using browser cryptography.

Password Generator

Create a random password locally, with a length from 8 to 128 characters.

UUID Generator

Generate a cryptographically random version 4 UUID without sending it to a server.

Pressure Converter

Convert pressure between SI units, bars, standard atmospheres and pounds per square inch.

Energy Converter

Convert energy quantities between joules, watt-hours and thermochemical calories.

Power Converter

Convert power between watts and common decimal multiples.

Angle Converter

Convert angles between degrees, radians, turns and gradians.

Time Unit Converter

Convert fixed durations between seconds, minutes, hours, days and weeks.

Frequency Converter

Convert periodic frequency between hertz and its decimal multiples.

Force Converter

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

Acceleration Converter

Convert acceleration between SI units, feet per second squared and standard gravity.

Density Converter

Convert mass density between common metric mass-per-volume units.

Fuel Economy Converter

Convert fuel efficiency between L/100 km, km/L, US mpg and imperial mpg.

Ratio Simplifier

Reduce a two-part whole-number ratio and see each part’s share of the total.

Proportion Calculator

Solve for x in the positive proportion a/b = c/x.

Weighted Average Calculator

Find an average when observations have different weights.

Percent Error Calculator

Compare a measured value with a nonzero reference using absolute percentage error.

Z-Score Calculator

Express an observation as standard deviations above or below a known mean.

Factorial Calculator

Calculate the exact factorial of a whole number from zero to 500.

Combinations Calculator

Count unordered selections of k distinct items from n items without replacement.

Permutations Calculator

Count ordered arrangements of k distinct items chosen from n without replacement.

Exponent Calculator

Raise a base to a positive, negative or fractional exponent when the result is real and finite.

Logarithm Calculator

Find the logarithm of a positive value in a positive base other than one.

Pythagorean Theorem Calculator

Find a right triangle’s hypotenuse from its two perpendicular legs.

Triangle Area Calculator

Find triangle area from a base and its perpendicular height.

Rectangle Calculator

Find a rectangle’s area, perimeter and diagonal from length and width.

Trapezoid Area Calculator

Calculate area from two parallel bases and their perpendicular separation.

Sphere Calculator

Find sphere volume, surface area and diameter from its radius.

CTR Calculator

Calculate clicks as a percentage of recorded advertising impressions.

Average Order Value Calculator

Find average revenue per order for a consistently defined reporting period.

Customer Churn Calculator

Measure the share of a starting customer cohort lost during a period.

Customer Retention Calculator

Estimate retention of starting customers using end-of-period customers and new acquisitions.

Inventory Turnover Calculator

Compare cost of goods sold with average inventory value over the same period.

Working Capital Calculator

Find the difference between current assets and current liabilities.

Current Ratio Calculator

Compare current assets with current liabilities as a liquidity ratio.

Contribution Margin Calculator

Calculate revenue remaining after variable costs to cover fixed costs and profit.

Break-Even ROAS Calculator

Estimate the ad revenue multiple needed to cover spend at a given contribution margin.

Payback Period Calculator

Estimate how long constant annual net cash inflows take to recover an initial outlay.

Savings Goal Calculator

Find the whole months needed to reach a target with a fixed monthly contribution.

Rule of 72 Calculator

Approximate the years needed to double a balance at a constant positive annual rate.

Effective Annual Rate Calculator

Convert a nominal annual interest rate into an effective rate with periodic compounding.

Real Return Calculator

Adjust a nominal percentage return for inflation over the same period.

Purchasing Power Calculator

Express a future nominal amount in starting-year money using an assumed constant inflation rate.

Debt-to-Income Calculator

Express monthly debt payments as a percentage of monthly gross income.

Unit Price Calculator

Compare package value by calculating cost per one unit of quantity.

Sales Tax Calculator

Add a supplied tax rate to a price or extract tax from an inclusive total.

URL Encoder and Decoder

Encode a URL component or decode percent-encoded UTF-8 text locally.

Base64 Encoder and Decoder

Convert UTF-8 text to Base64 or decode Base64 text in your browser.

JSON Formatter

Validate JSON syntax and format it with indentation or compact spacing.

Find and Replace Text

Replace every exact occurrence of a text fragment without regular expressions.

Coin Flip Simulator

Flip a fair virtual coin one or more times and count heads and tails.

Random Color Generator

Generate a random 24-bit RGB color and copy its hexadecimal code.

Random Name Picker

Choose one random nonempty entry from a list without uploading it.

Currency Converter

Convert an amount between 20 currencies using the latest available ECB reference rate.

Historical Currency Converter

Convert a past amount using an exchange rate for a selected historical date.

Currency Exchange Fee Calculator

Estimate the amount received after a percentage fee and a fixed fee in the source currency.

Foreign Price Comparison Calculator

Compare two prices listed in different currencies using a common reference rate.

URL Slug Generator

Turn a title into a clean lowercase URL segment with predictable separators.

Reading Time Calculator

Estimate reading duration from your text and a reading speed you choose.

UTM Link Builder

Add source, medium and campaign tracking parameters to an HTTP or HTTPS link.

URL Parser

Inspect the protocol, hostname, port, path, query and fragment of a web URL.

HTML Escape Tool

Encode five reserved HTML characters for use as plain text in HTML markup.

UTF-8 Byte Counter

Measure how many bytes a text string occupies when encoded as UTF-8.

Numbered List Generator

Add sequential numbers to nonempty text lines with a custom starting number.

Email Extractor

Find distinct common email-address patterns in pasted text without uploading it.

Savings Rate Calculator

Find the percentage of your take-home income left after spending over the same period.

Emergency Fund Calculator

Estimate a cash reserve for a chosen number of months of essential expenses.

Debt Payoff Calculator

Estimate how many monthly payments will repay one balance at a fixed annual rate.

Cash Runway Calculator

Estimate how many months your cash balance covers a constant monthly net cash burn.

Capacity Utilization Calculator

Compare actual output with available production capacity for the same period.

Prime Factorization Calculator

Break a positive whole number into its prime factors and show repeated factors as powers.

Rounding Calculator

Round a decimal to a chosen number of places, with nearest, upward or downward rounding.

Quotient and Remainder Calculator

Divide two nonnegative whole numbers and show an exact integer quotient and remainder.

Day of Year Calculator

Find a calendar date’s ordinal day number and the days remaining in its year.

Leap Year Calculator

Check whether a Gregorian calendar year contains February 29 and 366 days.

ISO Week Number Calculator

Find the ISO week number, week-year and Monday-through-Sunday range for a date.

Torque Converter

Convert torque between newton-metres, newton-centimetres and pound-force units.

Data Transfer Rate Converter

Convert network transfer rates between decimal bits and bytes per second.

CSV to JSON Converter

Convert comma-separated text with a header row into an array of JSON objects.

JSON to CSV Converter

Convert a JSON array of flat objects into CSV with a consistent header row.

Markdown Table Generator

Turn header-based CSV into a Markdown table ready to copy into a document or repository.

Arithmetic Sequence Calculator

Find an arithmetic sequence’s nth term, finite sum and first terms from a fixed difference.

Geometric Sequence Calculator

Generate terms and a finite sum for a sequence with a constant multiplier.

Distance Between Two Points Calculator

Calculate straight-line distance, coordinate changes and the midpoint of two points in a plane.

Slope Calculator

Find rise, run, slope and the y-intercept of the line through two coordinate points.

Linear Interpolation Calculator

Estimate a y value between two known points and identify when a result is extrapolation.

Number Base Converter

Convert signed integers between bases 2 through 36 without losing large integer precision.

Scientific Notation Converter

Write a decimal or E-notation number in scientific notation with a chosen display precision.

Aspect Ratio Calculator

Simplify image dimensions into an exact ratio and calculate a matching height for a new width.

Pixel Density Calculator

Calculate pixels per inch, physical screen dimensions and pixel pitch from resolution and diagonal size.

Download Time Calculator

Estimate file transfer duration from file size, connection speed and an adjustable usable-throughput percentage.

Required Grade Calculator

Find the average score needed on remaining coursework to reach a target overall percentage.

Work Hours Calculator

Calculate net shift hours after an unpaid break, including shifts that end the next day.