Weighted average calculator
Compute weighted average from multiple (value, weight) pairs

Inputs

Weighted average = Σ(value×weight) / Σ(weight). Rows with both fields empty are ignored.

Value
Weight
Actions
Fill inputs, then click Calculate.
Examples
• Grades: 80 (weight 0.3) + 92 (weight 0.7) → 88.4
• Average cost: $10 (100 shares) + $12 (50 shares) → $10.6667
About / 關於

Weighted average calculator — Compute a weighted average from multiple (value, weight) pairs. Useful for grades, average cost basis, and more. Shareable, browser-only.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

加權平均計算器 — 輸入多筆（數值×權重），一鍵算出加權平均、權重總和與加權總和。適用成績、平均成本等。可分享連結、純前端。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。