Every answer you need, one click away.
Free, fast, no sign-up. Over 100 tools that run entirely in your browser — your numbers never leave your device. Pick a calculator, generator, or converter below and get an instant answer.
Work out percentages, increases, decreases, and "what percent of" in seconds.
Find the percent increase or decrease between any two numbers.
Add, subtract, multiply, and divide fractions with simplified results.
Calculate the mean, median, and mode of any list of numbers.
Simplify ratios and solve for the missing value in a proportion.
Work out selling price, profit, and margin from cost and markup.
Find the sale price and how much you save at any percent off.
Add or remove sales tax and see the before- and after-tax totals.
Add or back out GST or VAT at any rate for invoices and receipts.
Compute mean, variance, and standard deviation for a data set.
Calculate single- and multi-event probabilities and odds.
Count combinations (nCr) and permutations (nPr) for any set.
Measure floor or wall area in square feet for any room or project.
Find the area of rectangles, circles, triangles, and more shapes.
Scale width and height while keeping the same aspect ratio.
Compute your grade point average from course grades and credit hours.
Split the bill and figure the tip per person at any percentage.
A clean everyday calculator for quick add, subtract, multiply, divide.
Trig, logs, powers, and roots for science and engineering math.
Find your body mass index from height and weight, metric or imperial.
Estimate the daily calories you need to maintain, lose, or gain weight.
Calculate your basal metabolic rate — calories burned at rest.
Split your daily calories into protein, carbs, and fat targets.
Estimate your body fat percentage from a few simple measurements.
See a healthy target weight range for your height and frame.
Find how much water to drink each day for your body and activity.
Estimate calories burned by activity, duration, and body weight.
Find your target heart-rate zones for fat burn and cardio training.
Work out running pace, time, or distance for any race or workout.
Estimate your due date and current week from your last period.
Calculate exact age in years, months, and days from any birth date.
Count the exact number of days between any two calendar dates.
Add or subtract days, weeks, or months to find a future or past date.
Find the elapsed time between two times in hours and minutes.
Count down the days and hours remaining until any event or deadline.
Count working days between dates, skipping weekends and holidays.
Find the ISO week number for any date in the calendar year.
Convert between Unix epoch time and human-readable dates.
Convert a time across cities and time zones around the world.
Count words, sentences, and reading time in any block of text.
Count characters with and without spaces for posts and limits.
Count the number of lines in any pasted text or list.
Switch text to UPPER, lower, Title, or sentence case instantly.
Reverse letters, words, or lines of any text in one click.
Sort lines alphabetically, numerically, or in reverse order.
Strip repeated lines from a list and keep only unique entries.
Clean up extra spaces, tabs, and blank lines from your text.
Find every match and swap it out across a whole block of text.
Pretty-print, minify, and validate JSON right in your browser.
Turn any title into a clean, URL-friendly slug for the web.
Create strong, random passwords with custom length and character sets.
Generate random numeric PIN codes of any length you choose.
Generate version-4 UUIDs and GUIDs instantly, one or many at a time.
Spin up unique, available-looking usernames for any account or handle.
Create cool gaming handles and tags for your next profile.
Generate random first and last names for testing, games, or characters.
Brainstorm catchy brand and company name ideas for your next venture.
Find fun, punchy team names for sports, trivia, and group chats.
Generate clever and funny SSID names for your home network.
Build memorable acronyms from a phrase or a set of keywords.
Generate relevant hashtags to boost reach on social posts.
Pull random words for brainstorms, games, and writing prompts.
Spark creative writing with random story ideas and prompts.
Generate random numbers within any range, with or without repeats.
Produce placeholder paragraphs, sentences, or words for mockups.
Generate harmonious color palettes for design and branding.
Build CSS gradients visually and copy the code in one click.
Convert length, weight, and temperature between metric and imperial.
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Convert mph, km/h, m/s, knots, and more in one place.
Convert bytes, KB, MB, GB, and TB across decimal and binary.
Convert cups, grams, ounces, and spoons for any recipe.
Convert numbers between binary, octal, decimal, and hex.
Switch between standard form and scientific notation easily.
Convert numbers to Roman numerals and back again.
Spell out any number in words for checks and documents.
Convert colors between HEX, RGB, HSL, and named values.
Translate text to Morse code and decode it back to letters.
Encode text to Base64 or decode Base64 back to plain text.
Percent-encode or decode URLs and query-string values.
Convert between world currencies at recent exchange rates.
Estimate monthly payments and total interest for any personal or auto loan.
See your home-loan payment, total interest, and full PITI breakdown.
Project how savings grow with compounding over time and contributions.
Estimate your nest egg at retirement from savings rate and returns.
Plan how fast you can clear debt and how much interest you'll save.
Split your income across spending and savings with the 50/30/20 rule.