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CalcChef

Access 566 free, high-performance, and client-side online calculators and tools. Math, finance, developer utilities, unit converters, and more—running in your browser.

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Math

Basic Calculator

Basic calculator for + − × ÷ in the standard order of operations (2 + 3 × 4 = 14), with % and memory keys, ^ for powers and the result as a fraction.

Math

Percentage Calculator

Percentage calculator for seven questions: X% of Y, X is what % of Y, percent change, percent difference, X is Y% of what, and a percent increase or decrease.

Conversion

Unit Converter

Convert length, weight, temperature, area, volume, speed, power, pressure, energy, data, time and force units. 1 mile is exactly 1.609344 km.

Finance

Mortgage Calculator

Monthly principal-and-interest payment on a fixed-rate mortgage from the loan amount, or home price and down payment, plus the total paid and total interest.

Finance

Loan Calculator

Work out a monthly loan payment, or solve for the amount, rate or term from the payment, with total interest and a year-by-year amortization schedule.

Health

BMI Calculator

BMI from your height and weight in cm and kg or feet, inches and lb, with the adult category and the weight range for a BMI of 18.5 to under 25.

Date

Age Calculator

Age calculator: enter a date of birth to get your age in years, months and days, total days alive, days to your next birthday and the weekday you were born on.

Date

Date Difference Calculator

Find the number of days between two dates, plus years, months and days, total weeks, ISO week numbers and business days minus six countries' public holidays.

Finance

Currency Converter

Convert USD to EUR, GBP to JPY or any pair of 160+ currencies at reference rates published once a day, with the date of the rates. Not a bank quote.

Dev

JSON Formatter

Paste JSON to format it with 2 spaces, 4 spaces or tabs, minify it or sort its keys. A syntax error is reported with its line, column and a caret under it.

Dev

QR Code Generator

Turn a link, any text of up to 2,000 characters or a Wi-Fi login into a QR code, pick its colors and save it as an SVG or a PNG up to 1,000 px wide.

Dev

Password Generator

Generate a random password of 8 to 128 characters from uppercase, lowercase, numbers and symbols, and see its entropy in bits. Can skip look-alike characters.

Text

Word Counter

Paste or type text to count words, characters with and without spaces, sentences, paragraphs and lines, plus reading time at 200 wpm and speaking time at 130.

Finance

Compound Interest Calculator

Compound interest calculator for a starting balance plus monthly deposits. Set the rate, years and compounding frequency to see the balance and interest earned.

Education

GPA Calculator

GPA calculator on the unweighted 4.0 scale. Enter credits and a letter grade for each course to get a semester GPA, and add earlier terms for a cumulative GPA.

Misc

Random Number Generator

Random number generator: draw 1 to 10,000 numbers between a minimum and maximum you set, as whole numbers or decimals, with or without repeats, sorted or not.

Science

V1, Vr and V2 Takeoff Speed Calculator

V1, Vr and V2 in knots from weight, wing area, thrust, flaps, runway, altitude and temperature, with the balanced field length. Not for flight use.

Conversion

Acceleration Converter

Convert acceleration units like m/s², g-force, and ft/s². Physics and automotive engineering tool.

Conversion

ASCII to Hex Converter

Text to hex and back: ASCII characters become two-digit codes, and é, € or emoji become code points or UTF-8, UTF-16 or Windows-1252 bytes.

Conversion

Frequency Converter

Frequency converter for Hz, kHz, MHz, GHz, THz, RPM, BPM, and more, with wavelength, period, musical note, and EM-band readouts.

CSS

CSS Clamp Generator

Generate a CSS clamp() for fluid font sizes and spacing from a min and max size and a viewport range, or edit an existing clamp with a live preview.

Science

Gun Recoil Energy Calculator

Free recoil energy in ft-lbs and joules, plus recoil velocity and momentum, from bullet weight, muzzle velocity, powder charge and gun weight.

Misc

Gift Wrapping Calculator

Wrapping paper sheet size and area, ribbon length and tape count for box or cylinder gifts, with a check that each sheet fits the roll width.

Conversion

Deck Board Calculator

Deck boards for a rectangular deck: rows across, pieces per row, linear feet or meters with waste, the ripped last board and an optional joist count.

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