COUPDAYS Google Sheet Formula
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COUPDAYS Formula Syntax
Example Use Case
Calculating the number of days in the coupon period containing the settlement date
Understanding the COUPDAYS Formula
The COUPDAYS function in Excel calculates the total number of days in the coupon period containing the settlement date. It's a bond analysis tool for calculating accrued interest—like determining the full period length for prorating interest payments.
COUPDAYS("2022-04-15", "2023-04-15", 2, 0) calculates the total days in the current coupon period for a bond with semiannual payments. It takes settlement, maturity, frequency, basis arguments, counting days per the specified day count convention—essential for accurate bond pricing and interest calculations.
Why Use COUPDAYS?
COUPDAYS determines period lengths—think bond pricing or interest accrual. Its day counting using industry-standard conventions makes it valuable for fixed-income analysis, yield calculations, or any scenario requiring precise interest proration over standard periods.
Example with Sample Data
| Parameters | Formula | Result |
|---|---|---|
| Settlement: 3/15/2022 Maturity: 12/15/2023 Frequency: 2 (semiannual) Basis: 0 (30/360) | =COUPDAYS("3/15/2022", "12/15/2023", 2, 0) | 180 |
| Settlement: 3/15/2022 Maturity: 12/15/2023 Frequency: 4 (quarterly) Basis: 0 (30/360) | =COUPDAYS("3/15/2022", "12/15/2023", 4, 0) | 90 |
| Settlement: 3/15/2022 Maturity: 12/15/2023 Frequency: 2 (semiannual) Basis: 1 (Actual/actual) | =COUPDAYS("3/15/2022", "12/15/2023", 2, 1) | 181 |
COUPDAYS measures full periods: 180 days in a semiannual period (30/360 basis), 90 days for quarterly payments. It's a coupon period measurer.
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