Free Everyday & Calculators Tools
QR codes, unit conversions, Unix timestamps, screen recorders, and scientific calculators.
- QR Code Generator & Scanner: Generate custom QR codes (SVG/PNG) with custom colors or scan QR codes from files.
- Unit & Measurement Converter: Precision conversions across length, weight/mass, data storage, speed, and temp.
- Unix Timestamp & Epoch: Convert Unix timestamps (seconds & ms) to UTC, local time, and ISO 8601.
- Screen & Voice Recorder: Capture browser screen video or microphone audio memos directly to your device.
- Metronome & Tone Generator: Precision BPM click track and pure waveform frequency generator (440Hz tuning).
- Scientific Calculator: Arithmetic calculations, trigonometry, square root, powers, and logarithms.
- Color Converter & Contrast: Convert HEX, RGB, HSL with WCAG 2.2 AA accessibility contrast ratio verification.
- Cron Expression Parser: Translate cryptic 5-field Cron schedules into plain, human-readable English.
- Audio & Voice Recorder: Record voice memos with live oscilloscope waveform visualization and WebM export.
- Barcode & SKU Studio: Generate high-density Code 128 barcodes as vector SVG or PNG for print and inventory.
- Roman Numeral Converter: Convert between Arabic numbers (1-3999) and Roman numerals in either direction.
- Age & Date Difference Calculator: Calculate the exact age or duration between any two dates down to the day.
- Random Picker, Dice & Coin Flip: Cryptographically random name picker, dice roller, and coin flip.
- BMI Calculator: Estimate Body Mass Index from weight and height in metric or imperial units.
- Loan & Mortgage Calculator: Estimate monthly payments and total interest for a fixed-rate amortizing loan.
- Percentage Calculator: Three common percentage problems solved instantly: of, what-percent, and change.
- World Clock: Live local time across multiple timezones, computed with the browser Intl API.
- Stopwatch & Countdown Timer: Precision stopwatch with lap splits, or a simple countdown timer.
- BPM Tap & Tempo Counter: Tap tempo counter calculating beats per minute, milliseconds per beat, classical markings, and delay times.
- Audio Pitch & Tuner Gauge: Detect fundamental audio frequency and tune musical instruments with a real-time cents needle gauge.
- Pomodoro Focus & Interval Timer: Customizable Pomodoro interval timer with circular progress display, audio chime, and session streak tracker.
- Fuel Cost & Mileage Calculator: Calculate trip fuel quantity, total cost, cost per kilometer/mile, and passenger cost splits.
- Tip & Bill Splitter: Calculate tips, optional sales tax, round up totals, and split bills evenly among people.
- Date Difference & Duration: Calculate exact calendar breakdown, business days, total hours, and percentage of year between two dates.
- Morse Code Audio Trainer: Interactive Morse code audio player and flashcard quiz trainer with customizable WPM and tone frequency.
Browse all free tools