Quick Tools
Everyday calculators for percentages, tips, dates, and more
Percentage Calculator
Calculate percentages in multiple ways
Tip Calculator
Calculate tips and split bills easily
Age Calculator
Calculate exact age from any date
Date Difference
Find days between two dates
Time Zone Converter
Convert between world time zones
Number to Words
Convert numbers to written words
About Our Quick Calculators
Sometimes you just need a quick calculation without the complexity. Our quick tools are designed for everyday math that we all need — calculating tips at restaurants, finding percentages, working with dates, or converting numbers for checks and legal documents.
Each tool includes detailed explanations and practical examples so you understand the math behind the results, not just the answer.
Percentage Calculations Explained
Percentages are everywhere: discounts, tax rates, interest rates, tips, statistics. Our percentage calculator handles all the common scenarios: finding a percentage of a number, calculating what percentage one number is of another, percentage increase or decrease, and reverse percentage calculations. Understanding percentages is fundamental to financial literacy and everyday decision-making.
Tipping Etiquette & Math
Tipping customs vary by country and service type. In the US, 15-20% is standard for restaurants, while other countries may include service charges. Our tip calculator handles custom percentages and splits bills among multiple people, accounting for tax when calculating the tip on the pre-tax amount — a common point of confusion.
Working with Dates
Date calculations are trickier than they appear due to varying month lengths, leap years, and timezone differences. Our date difference calculator handles these edge cases accurately, giving you the exact number of days, weeks, months, and years between any two dates — useful for project deadlines, contract durations, and age calculations.
Numbers in Written Form
Writing numbers as words is required for checks, legal documents, contracts, and formal financial correspondence. Our number-to-words converter handles numbers of any size with proper English grammar, including cents for currency amounts. This ensures accuracy in legal and financial documents where numeric ambiguity could cause disputes.