ToolForge

積立複利計算機

Investment growth calculator: enter principal, monthly contribution and return to get final assets and gains. Supports batch processing, export and one-click copy.

使い方

元本・月の積立額・利回り・期間を入力すると、期末資産・収益・年間明細がリアルタイムで計算されます。

Overview

Investment Growth Calculator is a Finance tool. Enter principal, monthly contribution and return to get final assets and gains. Supports batch processing, export 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 Investment Growth Calculator: Enter principal, monthly contribution, return and years for future value, gain and annual 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 Investment Growth Calculator offline or on poor network — all calculations stay local and private.
  • Model cash flow and payback
  • Compare mortgage amortization

How to use

  1. 1 Enter principal, monthly contribution, return and years for future value, gain and annual 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
  • Excludes fees/insurance
  • Nominal vs effective rate may differ

FAQ

Equal payment vs equal principal?
Equal payment is steady; equal principal saves total interest but starts higher.
Why a few dollars off from bank?
Day-count and rounding differences within 0.1%.
How is Investment Growth Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “investment calculator, 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。