What is a basis point
A basis point, often written as bp or bps for the plural, is a unit for measuring small changes in percentages. One basis point equals 0.01 percent. In decimal form that is 0.0001.
People use basis points when they talk about interest rates, bond yields, fees, and other financial percentages. It removes confusion when changes are small.
Quick conversions
- 1 basis point (1 bp) = 0.01% = 0.0001 (decimal).
- 10 bp = 0.10%
- 100 bp = 1%
- To convert percent to bp: multiply by 100. Example: 2.5% = 250 bp.
- To convert bp to percent: divide by 100. Example: 25 bp = 0.25%.
- To convert decimal to bp: multiply by 10,000. Example: 0.003 = 30 bp.
Formulas:
- bp = percent * 100
- percent = bp / 100
- bp = decimal * 10000
- decimal = bp / 10000
Why use basis points
Percent changes can be confusing when they are small. Saying "rates rose by 0.25 percent" can be read as a relative change rather than an absolute difference. Saying "rates rose by 25 basis points" is clear. It tells you the absolute change.
Markets, traders, and journalists use basis points to:
- Report central bank moves.
- Describe bond yield changes.
- Quote fees for funds and portfolios.
- Explain credit spread changes.
Examples you will see
- Central bank raises rates by 25 bp. That means the policy rate increases by 0.25 percentage points.
- Treasury yield falls from 3.00% to 2.75%. That is a drop of 25 bp.
- A mutual fund charges a 50 bp fee. That is 0.50% per year.
- A bond spread widens by 10 bp. That is 0.10 percentage points.
Money example
Imagine a $1,000,000 portfolio and a fee of 25 bp per year.
- 25 bp = 0.25% = 0.0025.
- Fee cost = $1,000,000 * 0.0025 = $2,500 per year.
This shows why a few basis points matter at scale.
Basis points in bond math
Traders talk about BPV or DV01. These measure how much a bond price changes for a one basis point move in yield.
- DV01 (dollar value of 01) tells you the dollar change in bond value for a 1 bp move in yield.
- If a bond has a DV01 of $80, a 1 bp rise in yield lowers its price by $80.
This helps risk managers and traders hedge interest rate risk.
Common mistakes
- Confusing percentage point with basis points. A 1 percentage point change equals 100 basis points.
- Misreading 0.25% as 25% or vice versa. Use basis points to avoid that.
How news uses basis points
News headlines often say "rates up 50 bp" or "spread widens 15 bp." That tells the reader the absolute size of the move. It avoids the ambiguity of percent changes.
Summary
A basis point is a small unit for measuring percentage changes. It equals 0.01 percent. Use basis points when you need clear, unambiguous language for interest rates, yields, fees, or spreads. Remember the simple conversion rules and the difference between basis points and percentage points. This keeps communication precise when small numbers matter.