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Unit Converter
Length, weight, temperature, speed — all in one
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More 🔢 Number & Math Tools
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Percentage Calculator
"What is X% of Y?" and reverse variants
Tip Calculator
Bill split + tip, with custom percentages
Loan/Mortgage Estimator
Monthly payments, total interest & amortization
Roman Numeral Converter
Numbers ↔ Roman numerals instantly
Age Calculator
Enter birthday → exact age in years, months, days, hours
Days Between Dates
How many days until or since any date