Tip amount and per-person split.
Weighted grade and needed final score.
Scale recipes and convert measures.
Convert shoe sizes between US, UK, EU, and measurement in Centimeters/Inches.
Convert clothing sizes between US, UK, EU, and International standards for men, women, and kids.
Calculate how many liters of paint you need for a room including walls and ceiling, minus doors and windows.
Estimate your annual carbon emissions based on energy, travel, and lifestyle.