Expense Ratio Calculator
The Expense Ratio Calculator shows how fund management fees eat into your investment returns over time. Enter a fund's expense ratio and your investment amount to see the annual cost, 10-year impact, and comparison against index fund alternatives.
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What is an Expense Ratio?
An expense ratio is the annual fee charged by a mutual fund or ETF to cover operating costs, expressed as a percentage of assets under management. A 0.50% expense ratio means you pay $50 per year for every $10,000 invested. This fee is deducted automatically from fund returns.
Expense ratios range from 0.03% for passive index funds (like Vanguard S&P 500) to over 2% for actively managed specialty funds. Over decades, even small differences in expense ratios compound into massive cost differences — a 1% higher fee can reduce your portfolio by 25% over 30 years.
使用される計算公式・方程式
この計算ツールは5つの主要な公式を使用しています：
1 Annual Fee Calculation ▼
A $100,000 investment in a fund with 0.75% expense ratio costs $750 per year in fees.
2 Fee Impact Over Time ▼
This calculates the total return difference caused by the expense ratio over multiple years.
3 Effective Return After Fees ▼
A fund earning 10% gross with a 1.5% expense ratio delivers 8.5% net return to investors.
比率計算ツールの使い方
この比率計算ツールは、以下の3ステップで簡単にご利用いただけます：
数値を入力
入力欄に既知の比率の値を入力します。求めたい未知数の入力欄は空欄のままにしておきます。
モードを選択
比率モード（解く、簡素化、スケーリング）を選択します。各モードで異なる計算式が適用されます。
結果を確認
計算するボタンを押します。結果画面に答えと、視覚的な比率バー、円グラフ、詳細なステップバイステップの解決プロセスが表示されます。
実例問題と段階的な解説
本比率計算ツールを使って、以下の3つの例題をステップバイステップで解決するプロセスです：
入力 1 $50,000 in a fund with 0.85% expense ratio
入力 2 Compare 0.10% vs 1.00% over 30 years on $100K
入力 3 What expense ratio keeps fees under $200/year?
よくある質問 (FAQ)
What is a good expense ratio? ▼
For index funds, 0.03%-0.20% is excellent. For actively managed funds, under 0.75% is good. Above 1.5% is expensive and hard to justify unless the fund consistently outperforms its benchmark after fees.
How are expense ratios charged? ▼
Expense ratios are deducted daily from the fund's net asset value (NAV). You don't receive a bill — the fee is automatically reflected in lower fund returns. A 0.50% annual ER means about 0.00137% is deducted each day.
Do ETFs have lower expense ratios than mutual funds? ▼
Generally yes. The average ETF expense ratio is about 0.16%, while the average mutual fund charges about 0.47%. Passive index ETFs can be as low as 0.03%.
Should I switch funds to save on expense ratio? ▼
Consider switching if the fee savings are significant (0.5%+ difference), the fund isn't outperforming, and there are no exit fees or tax consequences. Even 0.3% savings on a $200K portfolio saves $600/year.
Do expense ratios include trading costs? ▼
No. Expense ratios cover management fees, administration, and marketing costs (12b-1 fees). Trading costs (commissions, bid-ask spreads) are separate and reflected in fund returns but not the stated expense ratio.