Math & Tools

Calculators & Generators Calculators

Scientific calculator, random numbers, passwords, dice and more. Free calculators with formulas and worked examples.

Calculators

Scientific CalculatorType an expression or tap the keys. Results update as you type; press = or Enter to keep them in history.Graphing Calculator (Plot Functions Online)Type a function of x to plot it, find where it crosses zero and evaluate it at any point.

Generators

Random Number GeneratorPick a range and how many numbers you need, then press Generate.Password Generator (Strong, Random, Private)Choose the length and character types; a new password appears instantly.Dice Roller (d4, d6, d8, d10, d12, d20)Choose your dice and press Roll.Coin Flip Simulator (Heads or Tails)Flip once to decide, or flip many times to watch the law of large numbers.Random Name Picker (Winner and List Shuffler)Paste a list, choose how many to pick, and press Pick.Random Team GeneratorPaste the players, choose the number of teams and press Make teams.Lottery Number Generator (Quick Pick)Set your lottery's format and draw random lines, like a quick pick.

Timers

Online Stopwatch (with Laps)Press Start (or the space bar) to time anything, and Lap to record splits.Countdown Timer (Online Timer with Alarm)Set a time or tap a preset, then press Start.

Text tools

Word Counter (Words, Characters, Reading Time)Paste or type text to count words and characters instantly.Case Converter (Upper, Lower, Title, camelCase)Paste text and tap a case style.

Converters

Roman Numeral ConverterType a number or a Roman numeral to convert it.

About these calculators

Everyday calculating tools and generators: a full scientific calculator, random number and password generators, dice and coin tools. Everything runs in your browser; nothing you type is sent anywhere.

Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.

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Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.