Interest Meter

How much is your deposit really earning? Calculate simple and compound interest with after-tax amounts instantly. Premium adds 9 currencies and removes ads.

Do you know exactly how much interest your savings are earning?

Interest Meter is a clean, precise calculator for bank deposit interest. It supports both simple and compound interest, and automatically deducts withholding tax (default: Japan's 20.315%) so you can see your real take-home earnings.

--- Free Features ---

• Simple and compound interest calculation
• Compound frequency: yearly, semi-annual, monthly, or custom (specify any number of compounding events per year — e.g. 4 quarterly, 52 weekly, 365 daily)
• Flexible deposit period (1 to 50 years)
• See pre-tax and after-tax interest at a glance
• Year-by-year breakdown chart
• Customizable tax rate (default: 20.315%)
• Clean, intuitive design

--- Premium Features (one-time purchase) ---

• Switch the calculator to any of 9 foreign currencies (USD, EUR, GBP, AUD, CNY, HKD, SGD, KRW, THB)
• Live exchange rates with a JPY conversion section in the result view
• Ad-free experience across the entire app

--- Who Is This For? ---

• Anyone checking returns on fixed deposits
• People who want to see compound interest in action
• Savers who want to know their real after-tax yield
• Anyone taking the first step toward smarter money management
• Foreign-currency depositors who need quick JPY conversions

Simple by design. Check your deposit interest today.