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Percentage Change Calculator

Calculate percentage change, percentage of a value, original value.

⚠️ Not financial advice. Results are illustrative only and should not be used as the basis for any investment, tax, or financial decision. Consult a qualified financial adviser or chartered accountant before acting on any figure shown.

What is the % change from A to B?

パーセントで計算する5つの方法

日常的な用途

クイックリファレンス計算式

この計算ツールは一般的なパーセント計算のすべてを1か所で処理します。求めたい内容に応じて5つのモードを切り替えてください:

%変化 = (新値 − 旧値) / |旧値| × 100 | %of: B/A × 100 | AのX%: A × X/100 | 逆算: B / (X/100) | %差: |A−B| / ((A+B)/2) × 100

投資家はパーセント変化を使って2つの日付間のポートフォリオの損益を追跡します——例えば₹150から₹195に上昇した株は30%の増加です。買い物客は逆パーセントモードを使って割引前の元の価格を求めます:商品が25%引きで₹750なら、元の価格は₹1,000。教師と学生は、どちらも明確な基準値でない2つの実験値を比較するときにパーセント差を使います。財務チームはパーセント-ofモードを使って、各製品ラインが総売上に占める割合を計算します。

  • %変化:何かがどれだけ増減したか?
  • %Of:BはAの何パーセントか?
  • 値を求める:ある数値のX%はいくらか?
  • 逆算%:パーセントが適用される前の元の値は何だったか?
  • %差:2つの数値は対称的にどれだけ異なるか?
  • ファイナンス:株価変化、ポートフォリオの損益、給与昇給率を計算する。
  • ショッピング:割引前の元の価格を求め、セールの節約額を確認する。
  • 税金:請求書のGSTを計算し、税抜き価格を求める。
  • 理科:パーセント誤差、実験偏差、濃度変化。

よくある質問

How do I calculate percentage change?
Percentage change = ((New Value − Old Value) ÷ |Old Value|) × 100. A positive result is an increase, negative is a decrease. Example: from ₹80 to ₹100 is a 25% increase. From ₹100 to ₹80 is a 20% decrease (note: increase and decrease percentages are not symmetric).
What is the difference between percentage change and percentage difference?
Percentage change has a direction — it measures change from a starting value to an ending value. Percentage difference is symmetric — it compares two values without implying one came before the other, using the average of both as the denominator: |A−B| ÷ ((A+B)/2) × 100. Use percentage difference when neither value is the 'baseline'.
How do I find the original price before a discount?
Use the 'Reverse %' mode. If an item is discounted by 20% and now costs ₹800, enter B=800 and X=80 (it is now 80% of the original). The calculator returns ₹1,000 as the original price. Alternatively: Original = Sale Price ÷ (1 − discount%).
Why is a 50% increase followed by a 50% decrease not back to the original?
Starting at 100: a 50% increase gives 150. A 50% decrease of 150 gives 75, not 100. This is because the second percentage is applied to a different base. Percentage changes are multiplicative, not additive. This is why 'X% increase then X% decrease' always results in a net loss.
What is compound percentage growth?
Compound growth applies a percentage repeatedly. If a stock grows 10% per year for 5 years, it is not 50% total — it is (1.10)^5 − 1 = 61.05%. Use the CAGR calculator for multi-year compound growth calculations.

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