Treasury Rates Interpolation Calculator i Interpolates U.S. Treasury par yields to a non-standard WAL (Weighted Average Life of cashflows).

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Start here: enter the WAL for your cashflows. (If you don’t know the WAL, start with the PV/WAL Calc tab.)
WAL
Weighted Average Life of cashflows
i Input format: accepts years as a number (e.g., 8.66) or year/month formats such as “8y 8m”, “8y8m”, or months only like “104m”.
Invalid WAL format. Try 8.66 or 8y 8m or 104m.
Curve Date
i Defaults to the most recent available date; uses latest available on or before the selected date.
Additional Options
If amount is provided, PV is computed using the chosen compounding.
Quote basis i Treasury’s published par-yield curve is bid-side derived and does not include an ask curve. This section lets you apply an assumed bid/ask spread by tenor to estimate Mid or Ask rates. Spreads are editable assumptions.
Per-tenor bid/ask spread assumption (in bps of yield). Used to compute Mid/Ask curves.
i Chart points shown depend on WAL:

• If WAL is under 5 years, the chart includes shorter terms (3M, 4M, 6M) and omits 20Y and 30Y.
• If WAL is over 5 years, the chart omits 3M, 4M, 6M and includes longer terms such as 20Y and 30Y.

If WAL is exactly 5.00 years, both short and long points are shown.