Collection of useful calculators for everyday math, finance, and health calculations
A comprehensive collection of everyday calculators for common mathematical, financial, and health calculations. Perfect for quick calculations without needing multiple apps or complex tools.
Six different calculators in one convenient tool
Real-time calculations with detailed breakdowns
Metric and imperial units where applicable
Optimized for desktop and mobile devices
In the US, 18-20% is standard for good service at restaurants. 15% for average service, 25% for exceptional service. For other services: 10-15% for hair stylists, $1-2 per bag for hotel bellhops, 15-20% for taxi drivers.
BMI is a general screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes may have high BMI despite being healthy. It's less accurate for elderly, children, and certain ethnicities. Consult healthcare providers for complete health assessment.
Use the formula: ((New Value - Old Value) / Old Value) × 100. Positive results show growth, negative show decline. For example, if sales went from $1000 to $1200: ((1200-1000)/1000) × 100 = 20% increase.
Age calculations depend on the exact time and timezone. Our calculator uses your current date and time. Small differences may occur if calculated at different times of day or in different timezones, especially around birthdays.
Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus previously earned interest. Compound interest grows faster over time, making it more powerful for investments but more expensive for loans.
Yes! All calculations are performed in your browser locally. No data is sent to servers or stored anywhere. You can use these calculators offline once the page loads, ensuring complete privacy for your personal calculations.