Util Monster: Calculator

Stop searching for a different calculator every time. Util Monster brings 15 practical calculators for everyday life, finance, health, and study into one clear app.

Find the right calculator quickly
Browse by category or search for percentage, loan, compound interest, BMI, age, date difference, unit conversion, and more.

15 native calculators
• Percentage and discount
• Loan payment and total interest
• Compound interest and savings goal
• BMI, BMR, and daily calorie needs
• Age and date difference
• Length, weight, and temperature conversion
• Grade and average
• Circle area and circumference
• Speed, distance, and time
• Tip and tax
• Fuel economy conversion

Keep useful tools close
Save calculators to Favorites and reopen recently used tools without searching again.

Offline first
All calculations happen on your device. You do not need an account, and calculator inputs are not sent to a server.

Settings that fit you
Choose Korean or English, light or dark appearance, and metric or imperial defaults.

Health and finance results are general estimates. Check professional or institutional guidance before making important decisions.