Calculate your bowling handicap
Pick a preset or enter custom values. Result updates as you type.
Your current league average — total pins divided by games bowled. Recreational range: 110–150; competitive: 170–210.
Most leagues post these on the standings sheet. Ask the league secretary if you don't know.
What the calculator shows
A live result from the calculator above using the worked example on this page. Switch presets or type custom basis and percentage values to match your league sheet.
Handicap calculator with a 155 average on the USBC preset
How to calculate a bowling handicap
A bowling handicap evens the playing field across bowlers of different skill levels. Better bowlers earn fewer bonus pins; developing bowlers earn more. After the handicap is added to each scratch game, anyone in the league can theoretically win on a good night.
The standard USBC formula
- Basis is the high target score your league posts (220 is the most common).
- Average is your sanctioned league average — total pins ÷ games bowled.
- Percentage is the league’s adjustment factor (90% is USBC standard).
- The brackets ⌊ ⌋ mean “round down” — the USBC convention.
Worked example
You’re a 155-average bowler in a USBC-standard league (basis 220, percentage 90%). Your handicap is:
- Subtract your average from the basis: 220 − 155 = 65
- Multiply by the percentage: 65 × 0.90 = 58.5
- Round down to a whole number: handicap = 58
- Roll a scratch 145 → adjusted score is 145 + 58 = 203. Roll a scratch 175 → adjusted score is 233. Same handicap on every game that night.
Common league setups
| League type | Basis | Percentage | 155-avg handicap |
|---|---|---|---|
| Recreational | 210 | 80% | +44 |
| USBC standard | 220 | 90% | +58 |
| Competitive | 230 | 100% | +75 |
| Youth | 200 | 90% | +40 |
Bowling handicap chart: 90% of 220 and 80% of 210
Look up your average to get the pins added to every game under the two most common league setups. Both columns use the USBC round-down.
| Average | 90% of 220 | 80% of 210 |
|---|---|---|
| 100 | +108 | +88 |
| 110 | +99 | +80 |
| 120 | +90 | +72 |
| 130 | +81 | +64 |
| 140 | +72 | +56 |
| 150 | +63 | +48 |
| 160 | +54 | +40 |
| 170 | +45 | +32 |
| 180 | +36 | +24 |
| 190 | +27 | +16 |
| 200 | +18 | +8 |
| 210 | +9 | +0 |
Where to find your league’s basis & percentage
Both numbers are posted on the league standings sheet most weeks. If you can’t find them, ask your league secretary — they’re not secret, just easy to overlook. The official USBC rules and recommended formulas are documented at bowl.com / league resources.