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買い増し平均単価計算機

Stock average down calculator: calculate average cost, total cost and profit/loss from multiple buys for cost averaging, with one-click copy and offline.

使い方

1行に1回の買い付けを「価格,株数」で入力し、現在価格を設定します。

Overview

Stock Average Down Calculator is a Finance tool. Calculate average cost, total cost and profit/loss from multiple buys for cost averaging, with one-click copy and offline. 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 Stock Average Down Calculator: Enter one buy per line as price,shares, then set the current price. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Stock Average Down Calculator offline or on poor network — all calculations stay local and private.
  • Compare mortgage amortization
  • Estimate take-home and tax

How to use

  1. 1 Enter one buy per line as price,shares, then set the current price..
  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

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

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 Stock Average Down Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “average down” 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。