The hedge ratio calculator measures the percentage of your total investment amount covered by a hedge. Use it to check your current coverage or compare different hedging amounts. The result measures coverage—not how much investment risk has been eliminated.
How to use the hedge ratio calculator
- Enter the Hedged Amount: the dollar value of the investment exposure covered by your hedge. This is not necessarily the cost of buying the hedge.
- Enter the Total Invested Amount: the dollar value of the portfolio or investment you are assessing.
- Read the Hedge Ratio: the percentage calculated by dividing the hedged amount by the total invested amount.
Use nonnegative amounts and a total invested amount greater than zero. Both amounts should use the same currency, valuation date, and investment scope.
For example, if you are measuring currency hedging across your entire portfolio, use the total portfolio value as the denominator. If you use only foreign-currency investments instead, the result measures coverage of that subset—not the whole portfolio.
Hedge ratio formula and example
Hedge ratio (%) = (Hedged Amount ÷ Total Invested Amount) × 100
The calculator uses the hedged amount as the numerator and the total invested amount as the denominator. It does not estimate volatility, correlation, or hedge effectiveness.
Example: $50,000 hedged in a $150,000 portfolio
Suppose your portfolio contains $50,000 of investments covered by a currency hedge and $100,000 without currency hedging.
- Hedged Amount: $50,000
- Total Invested Amount: $150,000
Hedge ratio = ($50,000 ÷ $150,000) × 100 = 33.33%
Approximately one-third of the portfolio is covered by the currency hedge. The remaining $100,000, or 66.67%, is not covered by that hedge. This does not mean the portfolio’s overall investment risk has fallen by one-third: currency hedging does not remove risks such as falling stock prices.
How to interpret your hedge ratio
| Result | Meaning |
|---|---|
| 0% | No hedged amount has been entered. |
| Between 0% and 100% | The hedge covers part of the selected investment amount. |
| 100% | The entered hedged amount equals the total invested amount. This does not guarantee complete protection. |
| Above 100% | The entered hedge exceeds the selected investment base. Check for mismatched inputs or possible overhedging. |
The formula has no built-in mathematical ceiling of 100%. For example, $180,000 divided by $150,000 produces 120%. Whether that represents an intentional position or a sizing problem depends on how the exposure and hedge are measured.
A higher portfolio hedging ratio means more coverage relative to the chosen investment base. It does not automatically mean a better strategy: costs, timing, and the hedge’s behavior also matter.
Using the result to plan a hedge
You can use the ratio to compare your current coverage with a target you have chosen. To work backward from that target:
Required hedged amount = Total invested amount × Target hedge ratio ÷ 100
For a $150,000 portfolio and a 60% target, the required hedged amount is $90,000. If $50,000 is already hedged, an additional $40,000 of comparable exposure would need coverage, assuming the portfolio value stays unchanged.
Recheck the ratio when investment values change or hedges expire. Even without new trades, changes in the investment base can move your coverage away from its target.
Is this an optimal hedge ratio calculator?
No. This calculator measures coverage; it does not determine the optimal hedge ratio. A minimum-variance hedge ratio typically uses the relationship between movements in the underlying exposure and the hedging instrument, including their correlation and relative volatility.
Those inputs are not part of this calculator. It also does not calculate the number of futures or options contracts to trade. Contract sizing may require contract values, exchange rates, and—for options—sensitivity measures such as delta.
There is no universally best coverage percentage. A suitable target depends on the specific risk, investment horizon, hedge costs, and how much exposure you intend to retain.
What the coverage percentage does not tell you
- Hedge effectiveness: the hedge may not move closely enough with the exposure to offset losses as expected. Differences between the two can create basis risk.
- Costs and cash requirements: option premiums, transaction costs, financing, and margin requirements can affect the economics of a strategy.
- Timing: a hedge that expires before the exposure ends can leave a coverage gap.
- Other risks: a currency hedge does not also eliminate equity, credit, or interest-rate risk.
- Instrument-specific exposure: an option’s purchase price is not the amount it hedges. Its effective coverage can change as market conditions change.
Identify the risk you are hedging before choosing the amount to enter. The arithmetic is straightforward, but meaningful results depend on measuring the hedge and investment exposure consistently.
Related investment calculators
- Put Option Calculator: explore potential put-option profits and losses when evaluating downside protection.
- Sortino Ratio Calculator: assess returns relative to downside variability, rather than the share of investments hedged.
Build a calculator for your clients
Financial advisory firms can use Calcopolis to build a customized hedge coverage calculator for their websites. Let visitors compare current coverage with a chosen target and bring clearer figures to an advisory conversation.