Free online calculators & converters

Free, fast online calculators and converters — land area, fuel cost, drywall, IBAN validation, number to words and more. No sign-up, no tracking. Every tool here is also available as a free Android app.

• 🔢 Number to WordsSpell out any number — international or lakh/crore system.
• 📐 Marla CalculatorConvert marla, kanal, square feet, square meters and acres.
• 🏦 IBAN CheckerValidate any IBAN with the official mod-97 check.
• 🧱 Drywall CalculatorSheets, mud, tape and screws for any room.
• ➗ Fraction to DecimalTurn any fraction into a decimal and a percentage.
• ⛽ Fuel Cost CalculatorTrip fuel cost from distance, mileage and fuel price.
• 🎂 Age CalculatorExact age in years, months and days from a birth date.
• 💾 KB MB GB ConverterConvert bytes, KB, MB, GB and TB — binary or decimal.
• 🌾 Acre ConverterAcres to square feet, square meters, hectares, kanal and marla.
• 🔧 PSI to Bar ConverterConvert PSI, bar, kPa, MPa, atm and kgf/cm².