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複利計算機

Compound interest: compute final amount and interest from principal, rate and monthly investment with growth chart. Supports batch processing and one-click copy.

使い方

元金、年利率、期間を入力し、複利頻度（年/四半期/月/日/連続）を選択。毎月の積立額も任意で入力でき、残高、累計投入、結果、年次明細がリアルタイム表示されます。

Overview

Compound Interest Calculator is a Finance tool. Compound interest: compute final amount and interest from principal, rate and monthly investment with growth chart. Supports batch processing and one-click copy. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Compound Interest Calculator: Enter principal, annual rate and term, choose compounding frequency, optionally add monthly contributions. See balance vs contributions chart, totals, growth multiple and yearly schedule. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Compound Interest Calculator offline or on poor network — all calculations stay local and private.
  • Estimate take-home and tax
  • Plan savings and SIP compounding

How to use

  1. 1 Enter principal, annual rate and term, choose compounding frequency, optionally add monthly contributions. See balance vs contributions chart, totals, growth multiple and yearly schedule..
  2. 2 Toggle repayment methods to compare interest
  3. 3 Review schedule and charts
  4. 4 Copy or export details

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Check prepayment penalties
  • Nominal vs effective rate may differ
  • Excludes fees/insurance

FAQ

Why a few dollars off from bank?
Day-count and rounding differences within 0.1%.
Equal payment vs equal principal?
Equal payment is steady; equal principal saves total interest but starts higher.
How is Compound Interest Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “compound interest, investment growth” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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すべての計算はブラウザ内で実行され、データはアップロードされません。