How to use this calculator
- Enter short spot rate (%), long spot rate (%), short maturity (years), long maturity (years).
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Same credit risk and valuation date; annual effective inputs; no transaction costs.
Worked example
With short spot rate (%) = 5, long spot rate (%) = 6, short maturity (years) = 1, long maturity (years) = 2, implied annual effective forward rate is approximately 7.0095238%.
What the result means
This is a no-arbitrage implied rate under the selected compounding convention, not a predicted future rate.
Common questions
How should I interpret implied annual effective forward rate?
This is a no-arbitrage implied rate under the selected compounding convention, not a predicted future rate.
What should I check before using this result?
Same credit risk and valuation date; annual effective inputs; no transaction costs.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.