T Bill Calculator
Calculate the yield and profit of Treasury Bills (T-Bills) based on face value, purchase price, and days to maturity.
Published by:
isCalculator Editorial Team
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How to Use the T-Bill Calculator
This calculator computes the key metrics for a Treasury Bill (T-Bill) investment based on its face value, purchase price, and time to maturity.
- Enter the Face Value ($): The amount the T-Bill will be worth at maturity (e.g., $10,000). Must be a positive number.
- Enter the Purchase Price ($): The price you paid for the T-Bill (e.g., $9,800). Must be less than the face value.
- Enter the Days to Maturity: The number of days until the T-Bill matures (e.g., 182). Must be a positive integer.
- Click "Calculate": Press the button or hit Enter on any input field.
- Profit: The difference between face value and purchase price (your earnings).
- Yield (Annualized): The annualized return based on a 365-day year, calculated as (Profit / Purchase Price) × (365 / Days).
- Discount Rate: The annualized discount using a 360-day year, common in T-Bill markets.
- Investment Rate: Same as the annualized yield (365-day basis).
Results Explained:
All inputs must be positive numbers. Purchase price must be less than face value. Days must be a whole number ≥ 1.
Previous Results
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Frequently Asked Questions
A Treasury Bill (T-Bill) is a short-term U.S. government debt obligation with a maturity of one year or less. It is sold at a discount to face value and does not pay periodic interest.
The annualized yield is calculated as (Face Value - Purchase Price) / Purchase Price * (365 / Days to Maturity) * 100%.
The discount rate uses a 360-day year and is based on face value, while the investment rate uses a 365-day year and is based on purchase price, reflecting the actual return.
