How to Calculate Your Bowling Handicap — Step-by-Step Guide
Learn how to calculate your bowling handicap using the USBC formula. Covers averaging your scores, applying the basis average, percentage factor, and finding your adjusted score.
Calculating your bowling handicap takes three steps: find your average, subtract it from the basis average, and multiply by the percentage factor. The result — always rounded down to a whole number — is added to your raw game score for competition.
Skip the math with our Bowling Handicap Calculator.
The USBC Handicap Formula
Handicap = floor((Basis Average − Your Average) × Percentage Factor)
- Basis Average — A fixed number set by your league, typically 200, 210, or 220
- Your Average — The floor of your average score across your recent games
- Percentage Factor — Usually 90% in USBC leagues; sometimes 80% or 100%
- floor() — Always drop the decimal fraction, never round up
Step 1: Calculate Your Bowling Average
Add all your game scores together, divide by the number of games, and drop the fraction.
Formula: Average = floor(sum ÷ number of games)
Example: You bowled 157, 143, and 142 in your last three league games.
- Sum: 157 + 143 + 142 = 442
- Divide: 442 ÷ 3 = 147.33…
- Drop the fraction: average = 147
Always use floor (drop the fraction), not standard rounding. 147.9 becomes 147, not 148.
Step 2: Apply the Handicap Formula
Subtract your average from the basis average and multiply by the percentage factor.
Example (continued): Basis average = 200, percentage factor = 90%
- Difference: 200 − 147 = 53
- Multiply: 53 × 0.90 = 47.7
- Drop the fraction: handicap = 47
Step 3: Find Your Adjusted Score
Add your handicap to your raw game score.
Example: You bowl 143 tonight.
- Adjusted score = 143 + 47 = 190
This 190 is the number used in the league standings — not the raw 143.
Full Example Table
| Variable | Value |
|---|---|
| Game scores | 157, 143, 142 |
| Average | floor(442 ÷ 3) = 147 |
| Basis average | 200 |
| Percentage factor | 90% |
| Difference | 200 − 147 = 53 |
| Before floor | 53 × 0.90 = 47.7 |
| Handicap | 47 |
| Tonight's raw score | 143 |
| Adjusted score | 190 |
What Basis Average and Percentage Factor Should I Use?
Your league officials set these. Common combinations:
| Basis Average | Percentage Factor | Typical League Type |
|---|---|---|
| 200 | 90% | Most recreational USBC leagues |
| 210 | 90% | Intermediate / mixed leagues |
| 220 | 90% | Competitive / higher-average leagues |
| 200 | 80% | Leagues that want skill to play a larger role |
| 200 | 100% | Maximum equalization leagues |
If you are bowling informally with friends, 200 and 90% is a practical starting point agreed upon by most casual bowlers.
When Is Your Handicap 0?
If your average is equal to or greater than the basis average, the formula returns zero (or a negative number which is floored to zero). You bowl on scratch — raw score only, no adjustment.
Example: Average = 205, basis = 200 → (200 − 205) = −5 → floor = 0
How Often Does My Handicap Change?
In a formal league, your handicap is recalculated each week (or session) as your running average changes. Early in a season, the average is based on fewer games and may shift more noticeably. By mid-season, the average stabilizes and handicap changes become smaller.
Related Tools and Articles
- Bowling Handicap Calculator — instant calculation with multiple input options
- What is a Bowling Handicap? — full explanation of why handicap exists and how it works
- Bowling Score Calculator — track your raw game frame by frame
- Bowling Scoring Rules Explained — complete USBC rules reference
- What is a Good Bowling Score? — benchmarks by skill level