Small, fast, free tools.

Convert between Unix timestamps and human-readable dates across timezones.

Years, months, days, weeks, and total time between two dates. Optional business-days mode.

Exact age in years, months, days, hours, and seconds — plus the days until your next birthday.

Live countdown (or count-up) to any target date and time, in any timezone.

Decode any cron schedule into plain English and see the next few fire times.

Compare working hours across up to six time zones to find the best meeting window.

Convert freely between "1h 30m", "01:30:00", and seconds.

Convert any time between 12-hour (AM/PM) and 24-hour notation.

Estimate monthly repayments, total interest, and amortisation for a home loan.

Project compound growth with regular contributions over time.

Calculate the tip and total on a restaurant bill, with optional split across a group.

Add or extract sales tax, VAT, GST or HST with built-in rates for common jurisdictions.

Convert a salary between annual, monthly, bi-weekly, weekly, daily, and hourly equivalents.

Project the future value of a lump-sum investment under compound interest at any compounding frequency.

Calculate return on investment and annualised return, or solve for break-even unit volume.

Compare two loan offers side-by-side: payment, total interest, total paid, and payoff date.

Convert a Canadian dollar amount between any two years using Statistics Canada CPI data.

Convert between RGB, HEX, HSL, and CMYK colour spaces.

Check colour contrast against WCAG AA and AAA accessibility thresholds.

Build colour schemes from a base hue — complementary, analogous, triadic, split-complementary, tetradic, and monochromatic.

Build linear, radial, and conic CSS gradients with multiple stops; live preview; copy the CSS.

Convert pounds, kilograms, ounces, grams, and stones.

Convert litres, gallons (US/UK), millilitres, and fluid ounces.

Convert kilometres, miles, metres, feet, and more.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine.

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

Convert square metres, square feet, acres, hectares, and more.

Convert joules, kilowatt-hours, calories, BTU, and more.

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

Convert PSI, bar, kPa, atm, mmHg, and more.

Convert bytes, kilobytes, megabytes, gigabytes (decimal vs. binary), and bits.

Convert between US MPG, imperial MPG, L/100 km, and km/L — the non-linear maths handled for you.

Pretty-print, validate, or minify JSON with helpful error positions.

Encode text to Base64 or decode Base64 back to text. UTF-8 safe.

Percent-encode or decode URLs and query parameters.

Decode a JSON Web Token to inspect its header and payload.

Turn any text into a clean URL-safe kebab-case slug.

Convert between camelCase, PascalCase, snake_case, kebab-case, and more.

Live counts of characters, words, sentences, paragraphs, lines, and reading time.

Test patterns with live match highlighting and browse a library of common regexes.

Compare two pieces of text side-by-side or unified with line- and word-level highlighting.

Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text or file.

Generate one or many cryptographically-random UUIDs (v4) in seconds.

Strong, random passwords with configurable length, charset, and entropy estimate.

Generate placeholder text by paragraphs, sentences, or words.

Generate a QR code from any text or URL; download as PNG or SVG with custom colours and error correction.

Generate random integers, roll N dice with D sides, or flip N coins; uses cryptographic randomness.

Generate rows of fake names, emails, addresses, and dates for testing; export as table, CSV, or JSON.

Three quick percentage calculators: % of a number, what % is X of Y, and percent change.

Convert between fractions and decimals, simplify, and find best rational approximations.

Solve a right triangle from any two sides, or one side and one acute angle.

Solve ax² + bx + c = 0 — real or complex roots, vertex, axis of symmetry.

Find the greatest common divisor, least common multiple, prime factorisation, and divisors.

Body Mass Index from weight and height, with category and healthy weight range.

Daily energy expenditure (Mifflin-St Jeor) with cut, maintain, and bulk targets plus macros.

Convert between distance, time, and pace with race presets and per-km/mile splits.

Convert between px, rem, em, pt, and % using configurable root and parent font sizes.

Search any HTTP status code by number or keyword — name, meaning, and spec reference.

Break down a browser user-agent string into browser, engine, OS, and device.

Build CSS easing curves visually — drag two control points, preview the animation, copy the cubic-bezier(...) string.

Look up the abbreviation, capital, and joined-confederation year for any Canadian province or territory.

Work out concrete volume, pre-mix bag count, and cost for a slab — metric or imperial.

Size a stair from the total rise — risers, treads, stringer length, and NBCC compliance.

Work out how many floor tiles and boxes you need, including grout joints and a waste margin.

Estimate posts, stringers, palings, a top cap board, and concrete — with board counts and offcuts.

Count the bricks or blocks and mortar a wall needs, with openings and a waste margin.

Work out how much paint a room needs and which tins to buy, with doors, windows, and coats.

Convert between roof pitch, angle, and rafter length — rise/run or degrees, metric or imperial.

Find the footing depth a post needs from frost line, post height, and a practical minimum.

Estimate deck boards, joists, and screws from the deck size and board and joist spacing.

Work out a drain pipe's fall, gradient, and end depth, with a self-cleansing range check.

Count retaining-wall blocks, caps, and the base and drainage gravel for a block wall.

Calculate dig volume in-situ and after swell, plus the truck loads to cart spoil away.