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Compound interest calculator: initial principal plus periodic contributions, with monthly/yearly compounding and yearly chart. Main Features: ⭐ Initial Principal: The starting lump-sum investment ⭐ Periodic Contribution: Amount to be added regularly ⭐ Contribution Frequency: Choose "monthly" or "yearly" contribution ⭐ Compounding Frequency: Choose "monthly compound" or "yearly compound" ⭐ Annual Return Rate: Enter as a percentage (e.g. 2 means 2%) ⭐ Investment Periods: Specify in "months" or "years" depending on contribution frequency The calculator instantly computes and displays: **Initial Principal, Total Contributions, Total Interest, Final Amount**. ------------------------- Three Display Modes 📝 Summary: Overview of initial principal, total contributions, total interest, and final amount 📊 Bar Chart: Visualize annual total contributions, interest, and final amount for trend comparisons 🖥️ Details Table: Year-by-year breakdown of contributions, interest, and final amount for copying or comparison Switching views does not recalculate; any parameter change auto-updates all views instantly. ------------------------- Usage Scenarios 💰 Simulate results of monthly savings or regular investments over years 💰 Compare "monthly compounding" versus "yearly compounding" effects 💰 Assess the impact of different rates, contributions, or periods 💰 Quickly view yearly asset growth and interest ratios ------------------------- Privacy & Data 😀 All calculations are performed locally on your device 😀 No data is collected or transmitted; works fully offline Just click the toolbar icon to open the calculator and try compound interest conveniently, anytime. ------------------------- Change Log 1.2.0 Adjust "Contribution Amount" and "Annual Return Rate (%)" to allow negative values. 1.1.0 Added English and Japanese support 1.0.1 Fixed Windows display issue (2026-03-12)