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ETF Premium/Discount to NAV Calculator: Formula and Cost

An ETF premium or discount measures the gap between its market price and net asset value per share. A positive result is a premium; a negative result is a discount. Use this calculator to express that gap in percent, basis points, and dollars, and to compare how a change between entry and exit can affect a hypothetical holding. Quick answer Use contemporaneous values in the same currency. Divide market price by NAV per share, subtract 1, and multiply by 100. A market price of $50.10 against a $50.00 NAV is a 0.20% premium, or 20 basis points. A market price of $49.90 against the same NAV is a 0.20% discount. Premium/discount %: ((market price / NAV per share) - 1) x 100. Basis points: premium/discount % x 100. Position deviation: (market price - NAV per share) x shares. Entry-to-exit effect: exit position deviation - entry position deviation. A discount is not automatically a bargain. It may reflect stale underlying prices, market stress, transaction costs, difficult...
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ETF Total Cost Calculator: Expense Ratio, Spread, and Commissions

An ETF's total cost is broader than its expense ratio. A practical estimate should separate recurring fund operating expenses from transaction costs such as the bid-ask spread and brokerage commissions. Use this calculator to model those components over a stated holding period without automatically adding tracking difference or premium/discount changes that may overlap with, or behave differently from, the entered costs. Quick answer For a transparent planning estimate, model three buckets: recurring fund expenses, spread-related trading friction, and direct transaction charges. Keep historical tracking difference, premium/discount changes, taxes, foreign exchange, market impact, and advice fees separate unless you have compatible data and a clear reason to include them. Recurring estimate: average invested value 횞 annual expense ratio 횞 holding years. One-way spread estimate: trade notional 횞 quoted spread in basis points 첨 10,000 첨 2. Direct charges: number of trad...
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ETF Cost Calculators: Expense Ratio, Tracking Difference, and Bid-Ask Spread

ETF cost is not one number. An expense ratio describes recurring fund operating expenses, tracking difference shows the historical return gap versus a benchmark, and the bid-ask spread measures trading friction at a particular quote. Use the three StockWin calculators below to keep those measures separate before combining them into a practical comparison. Choose the cost you need to measure 1. Expense ratio Estimate the hypothetical dollar drag of an annual fund expense ratio over a holding period. Open the ETF Expense Ratio Calculator 2. Tracking difference Compare an ETF's NAV total return with the return of its stated benchmark over matching dates. Open the Tracking Difference Calculator 3. Bid-ask spread Convert a live bid and ask into dollars, percent, basis points, and a simple round-trip estimate. Open the Bid-Ask Spread Calculator Last reviewed: July 22, 2026 | Author and reviewer: StockWin Editorial Team ETF cost comparison at a glance Measur...
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ETF Bid-Ask Spread Cost Calculator: Dollars and Basis Points

An ETF bid-ask spread is the difference between the highest quoted price a buyer will pay and the lowest quoted price a seller will accept. If you buy at the ask and could immediately sell at the bid while prices remain unchanged, the spread becomes a trading cost. Use the calculator to convert a live quote into dollars, percent, and basis points. ETF Bid-Ask Spread Cost Calculator Enter a bid and ask observed at the same time. The model assumes a purchase at the ask and an immediate sale at the bid with no price movement. Real execution can differ because quotes, available size, and market conditions change. Bid price (USD) Ask price (USD) Number of shares Broker commission per trade (USD) Calculate spread cost Quote midpoint $100.00 Quoted spread $0.10 0.10% | 10.00 bps Estimated one-way cost $5.00 Half-spread relative to midpoint Estimated round-trip cost $10.00 Break-even move: 0.10% Round-trip estimate includes the full quoted spread plus two entered c...
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