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Fuel Cost Calculator
Calculate fuel cost for a trip. Enter distance, fuel efficiency, and price per gallon/liter to get total cost and cost per mile/km.
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Unit Converter
Convert between length, weight, temperature, speed, and data units. Fast, accurate, and easy to use.
QR Code Generator
Generate QR codes for URLs, text, email, phone numbers, and WiFi. Download as PNG or SVG for free.
Schulte Grid — Attention Training
Train your focus and peripheral vision with the classic Schulte Grid. Click numbers 1 to N in ascending order as fast as you can. Multiple grid sizes from 3×3 to 7×7.
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates. Useful for schedules, planning, and deadlines.