無料&即時 — 登録不要でご利用いただけます

Expense Ratio Calculator

See exactly how much fund management fees cost you each year and over time. Enter your investment amount and fund expense ratio to calculate annual fees, compare low-cost vs. high-cost funds, and understand the compounding impact of expenses on your long-term wealth.

Expense Ratio Calculator — リアルタイム比率プレビュー
Annual Cost
—
A
B
⚖️
Proportion Solver
A : B = C : D — Enter any 3 values
:
=
:
📊
Results
Visual ratio breakdown
Solved Proportion
—
Simplified
—
Percentages
—
Decimal
—
Fraction
—
Visual Ratio
A
B
Part A: —
Part B: —
    ✨
    Ratio Simplifier
    Reduce any ratio to its simplest form
    :
    📊
    Simplified Result
    Reduced to lowest terms
    Simplified Ratio
    —
    GCD Used
    —
    Percentages
    —
    Decimal Ratio
    —
    Fraction
    —
    Visual Ratio
    A
    B
    Part A: —
    Part B: —
      📐
      Ratio Scaler
      Multiply a ratio by a scale factor
      :
      ×
      📊
      Scaled Result
      Ratio after scaling
      Scaled Ratio
      —
      Original
      —
      Factor
      —
      Percentages
      —
      Simplified
      —
      Visual Ratio
      A
      B

        🕐 Recent Calculations

        📭
        No calculations yet. Start computing above!

        What is an Expense Ratio?

        An expense ratio is the annual percentage fee charged by mutual funds and ETFs to cover management, administration, and operational costs. Expressed as a percentage of assets under management (AUM), it is deducted daily from the fund's net asset value. A 0.50% expense ratio on a $100,000 investment costs $500 per year — money subtracted directly from your returns without ever appearing on a bill.

        Expense ratios range from as low as 0.03% for broad market index funds (like Vanguard's Total Stock Market ETF) to over 2.00% for actively managed specialty funds. While the percentage differences seem tiny, compounding magnifies the impact dramatically: a 1% higher expense ratio can reduce your portfolio value by 25% or more over a 30-year investment horizon, potentially costing hundreds of thousands of dollars in lost wealth.

        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 ▼
        Annual Fee = Investment Amount × (Expense Ratio / 100)

        A $100,000 investment in a fund with 0.75% expense ratio costs $750 per year in fees.

        2 Fee Impact Over Time ▼
        Cost = Investment × ((1 + Return)^Years - (1 + Return - ER)^Years)

        This calculates the total return difference caused by the expense ratio over multiple years.

        3 Effective Return After Fees ▼
        Effective Return = Gross Return - Expense Ratio

        A fund earning 10% gross with a 1.5% expense ratio delivers 8.5% net return to investors.

        Explore all calculation options on the 比率計算ツール home page.

        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:

        1

        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。

        2

        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。

        3

        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
        1 Convert expense ratio percentage to decimal: 0.85% = 0.0085.
        2 Multiply portfolio value by expense ratio: 50,000 × 0.0085 = 425.00/year.
        3 Calculate daily fee deduction: 425 ÷ 365 ≈ 1.16/day.
        ✓ Annual Management Fee is 425.00/year
        入力 2 Compare 0.10% vs 1.00% over 30 years on $100K
        1 Assuming 7% annual gross growth on 100,000 over 30 years:
        2 At 0.10% net 6.90%: Final balance ≈ 739,890 (Fees paid ≈ 21,340).
        3 At 1.00% net 6.00%: Final balance ≈ 574,349 (Fees paid ≈ 186,881).
        4 Lost wealth to high fee: 739,890 - 574,349 = 165,541.
        ✓ Fee difference costs 165,541 in lost returns
        入力 3 What expense ratio keeps fees under $200/year?
        1 Given portfolio value (80,000) and max fee (200):
        2 Divide max fee by portfolio value: 200 ÷ 80,000 = 0.0025.
        3 Convert to percentage: 0.0025 × 100% = 0.25%.
        ✓ Maximum Expense Ratio is 0.25%

        よくある質問 (FAQ)

        What is a good expense ratio? ▼

        For passive index funds, 0.03% to 0.20% is excellent. For actively managed domestic equity funds, under 0.75% is reasonable. For international or specialty funds, under 1.00% is acceptable. Above 1.50% is expensive and difficult to justify unless the fund has a proven track record of outperformance after fees.

        How are expense ratios charged? ▼

        Expense ratios are deducted daily from the fund's net asset value (NAV) as a fraction of the annual rate. You do not receive a bill or invoice. A 0.50% annual expense ratio means approximately 0.00137% (0.50% ÷ 365) is deducted from the fund's value each day, reducing your returns automatically.

        Do ETFs have lower expense ratios than mutual funds? ▼

        Generally yes. The asset-weighted average ETF expense ratio is about 0.16%, while the average mutual fund charges about 0.47%. This difference exists because most ETFs are passively managed index trackers, while many mutual funds are actively managed with higher research and trading costs.

        Should I switch funds to save on expense ratio? ▼

        Consider switching if: the fee difference exceeds 0.3% annually, the funds track the same or similar indexes, there are no exit fees or significant tax consequences from selling, and the new fund has adequate liquidity. Even 0.3% savings on $200,000 saves $600 per year, compounding to tens of thousands over decades.

        Do expense ratios include trading costs? ▼

        No. The stated expense ratio covers management fees, administrative costs, and 12b-1 marketing fees. Trading costs (brokerage commissions, bid-ask spreads, market impact) are separate and reflected in the fund's return but not in the published expense ratio number.

        How much do expense ratios cost over 30 years? ▼

        On a $100,000 portfolio growing at 7% annually: a 0.10% expense ratio costs about $21,000 over 30 years. A 1.00% expense ratio costs about $187,000 over the same period. The difference is approximately $166,000 in lost wealth — money that would have been yours with the lower-cost fund.

        What is a total expense ratio (TER)? ▼

        The Total Expense Ratio (TER) is the comprehensive annual cost of owning a fund, including management fees, administrative costs, legal expenses, auditing fees, and other operational costs. In the U.S., TER is essentially the same as the expense ratio. In Europe and the UK, TER is the standard disclosure metric.

        Are expense ratios tax-deductible? ▼

        Since the 2017 Tax Cuts and Jobs Act, investment advisory fees and fund expenses are no longer deductible for individual investors in the U.S. Prior to 2018, they were deductible as miscellaneous itemized deductions. The expense ratio reduces your taxable gains indirectly by lowering your net returns.

        What is the average expense ratio for a 401(k)? ▼

        The average 401(k) plan expense ratio has declined to approximately 0.36% for equity funds, down from over 0.60% a decade ago. Plans offered by large employers tend to have lower ratios due to institutional share class access. If your 401(k) funds charge above 0.50%, advocate for lower-cost options.

        Do target-date funds have higher expense ratios? ▼

        Target-date funds typically charge 0.10% to 0.75%, depending on the provider and whether they use index or active underlying funds. Vanguard's target-date funds charge 0.08-0.15%, while some actively managed versions exceed 0.60%. Check whether the stated ratio includes the underlying fund costs.

        How do I find a fund's expense ratio? ▼

        Check the fund's prospectus, fact sheet, or your brokerage platform's fund detail page. Websites like Morningstar, Yahoo Finance, and the fund company's own site list expense ratios prominently. Look for 'Net Expense Ratio' (after waivers) rather than 'Gross Expense Ratio' for the actual current cost.

        比率の理論を学ぶ

        比率とは具体的に何ですか?

        比率とは、2つ以上の数量の大きさを互いに比較して相対的な割合を表した数値です。記号では A : B のように表し、「Aの量に対してBの量が対応する」という相互関係を意味します。例えば、3 : 4 の比率は、Aが3つ分配されるときBは4つマッチするという正比例関係を持ちます。料理、工学設計、財務分析など日常のあらゆる場面で使われます。

        比例式はどのように解きますか?

        比例式は、2つの比率の値が等しいことを表す等式です(A : B = C : D)。外項の積(A × D)と内項 of 積(B × C)は常に等しくなります。未知数 D を求めるには、内項の積を求め、それをもう一方の外項 A で割ります: D = (B × C) / A。当ツールの比例式解決モードに既知の3つの数値を入力すれば、未知数を即座に算出できます。

        比率はどのように簡単に整理しますか?

        2つの数値の最大公約数(GCD)を求めた後、両方の数値をその最大公約数で割って約分します。例えば 24 : 36 の場合、24と36の最大公約数が 12 なので、両方を 12 で割ると最も簡単な自然数の比である 2 : 3 になります。比率計算ツールがGCDの算出と約分を自動的に処理します。

        比率のスケーリングはいつ使用しますか?

        比率の関係を崩さずに全体の分量を増やしたり減らしたりするときに使用します。例えば、2 : 5 の割合の材料があるとき、両方に 3 を掛ければ 6 : 15 になり、同じ比重を保ったまま3倍の量の配合物を準備することができます。パン生地の容量変更や、図面の縮尺変更に欠かせません。

        比率と分数の違いは何ですか?

        比率(A : B)は同等の要素同士の大きさの比較(部分対部分)に適しており、分数(A/B)は全体の中である要素が占める割合(部分対全体)を表現することが多いです。ただし、比率 3 : 4 も分数 3/4(小数で0.75)として表現できます。使われる文脈や意味合いにおいてニュアンスの違いがあります。