Calculators & Converters

Standard calculator, percentage, discount, compound interest, loan, Gross-Net salary, BMI, age, date diff, units, and live FX rates.

• Standard Calculator — Fast arithmetic calculator with expression history and keyboard support.
• Percentage Calculator — Calculate X% of Y, percentage ratio A/B, and percentage increase/decrease.
• Discount Calculator — Calculate final sale price, savings amount, and stacked discounts with tax.
• Simple Interest Calculator — Calculate savings or short-term simple interest with transparent assumptions.
• Compound Interest Calculator — Project investment growth with recurring monthly contributions and yearly tables.
• Loan & Mortgage Calculator — Estimate monthly loan repayments under reducing balance or equal annuity schedules.
• Age & Zodiac Calculator — Calculate exact age, Lunar age, Chinese/Vietnamese zodiac (Can Chi), and birthday countdown.
• Date Difference Calculator — Count exact days, weeks, and approximate months between any two dates.
• All-in-One Unit Converter — Convert length, weight (including Vietnamese gold luong/chi), and temperature.
• Length Converter — Convert meters, km, cm, mm, inches, feet, and miles accurately.
• Weight & Gold Mass Converter — Convert kg, grams, pounds, ounces, and Vietnamese gold units (luong/chi).
• Temperature Converter (°C / °F / K) — Convert Celsius, Fahrenheit, and Kelvin with exact physics formulas.
• BMI Calculator (WHO & Asian) — Calculate Body Mass Index with both global WHO and Asia-Pacific classification.
• Currency Converter (Live FX) — Convert USD, EUR, GBP, JPY, CNY, KRW, AUD, SGD to VND using ExchangeRate-API.
• Vietnam Gross ↔ Net Salary & PIT Calculator — Convert Gross to Net (and Net to Gross) with Vietnam insurance caps and 7-bracket PIT.
• TikTok, Facebook Reels & YouTube Shorts Revenue & RPM Calculator — Estimate creator earnings in USD & VND from video views, regional RPM, engagement rate, and affiliate conversions.