Treasury Bill Calculator
Calculate T-bill discount earned, bank discount yield, and investment yield.
- Last reviewed
- July 8, 2026
- Cost
- Free to use
- Data
- Runs in your browser
Discount Earned
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Maturity Value
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Bank Discount Yield
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Investment Yield
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Methodology
How this calculator handles inputs
This calculator uses the values you enter above and applies the formula explained in the guide below. Results update in the browser and are intended for quick planning, comparison, and sanity-checking.
- Use consistent periods, currencies, and units across inputs.
- Review any assumptions before using the result in a decision.
- Recalculate when rates, prices, tax rules, or business terms change.
Important note
This tool provides general planning information only. It is not tax, legal, financial, accounting, or investment advice. Check the current rules for your location and speak with a qualified professional before making a high-stakes decision.
Guide
How it works
Use this calculator to estimate Treasury bill return and yield.
What this calculator does
The Treasury bill calculator uses face value, purchase price, and days to maturity to estimate discount earned, bank discount yield, and investment yield.
Treasury Bill Formula
Discount Earned = Face Value - Purchase Price
Investment Yield = (Discount / Purchase Price) x (365 / Days)
Example calculation
If you buy a 10,000 T-bill for 9,850 and it matures in 91 days, the calculator estimates the yield.
When to use this calculator
- comparing T-bills
- estimating short-term returns
- checking maturity proceeds
- comparing cash alternatives
FAQs
Does a T-bill pay interest?
T-bills are typically bought at a discount and mature at face value.
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