How is a bowling score calculated?

Add the pins knocked down in each frame, plus bonuses for strikes and spares. Strike (X): 10 + your next two balls, Spare (/): 10 + your next ball, Open frame: pins from both balls.

What do the symbols on a scoreboard mean?

X: strike, /: spare, -: miss (0 pins), F: foul (0 pins). The small boxes show each ball; the big number underneath is the running total.

Bowling score calculator

Type each frame with X (strike), / (spare) or the number of pins. Your running score updates as you go, with where each bonus came from and the highest score still possible.

Rules: traditional ten-pin scoring. Checked October 28, 2026 (sources). Free, no sign-up, nothing you type is stored.

Final score

167

All 10 frames bowled

Marks and running total by frame (1–5)
1	2	3	4	5
X	7 /	9 -	X	- 8
20	39	48	66	74

Marks and running total by frame (6–10)
6	7	8	9	10
8 /	- 6	X	X	X 8 1
84	90	120	148	167

Frame 1 strike10 + next balls 7 + 3

Frame 2 spare10 + next ball 9

Frame 4 strike10 + next balls 0 + 8

Frame 6 spare10 + next ball 0

Frame 8 strike10 + next balls 10 + 10

Frame 9 strike10 + next balls 10 + 8

Frame 10 strike10 + next balls 8 + 1

Max possible scoreIf every remaining ball is a strike (or a spare when a strike isn't possible)

167

A strike adds the pins from your next two balls, a spare adds your next one. Frames still waiting for bonus balls stay blank.

How bowling scoring works

Frame scoring
Result	Mark	Frame score
Strike	X	10 + pins from your next two balls
Spare	/ (e.g. 7/)	10 + pins from your next ball
Open frame	digits (e.g. 9-)	pins from both balls
10th frame	X81, 7/X, 9-	bonus balls are added to the 10th frame only

Three worked examples

ExampleStrikes, spares and open frames · X 7/ 9- X -8 8/ -6 X X X81

Frame 1: X: 20 (10 + 7 + 3) → 20
Frame 2: 7 /: 19 (10 + 9) → 39
Frame 3: 9 -: 9 → 48
Frame 4: X: 18 (10 + 0 + 8) → 66
Frame 5: - 8: 8 → 74
Frame 6: 8 /: 10 (10 + 0) → 84
Frame 7: - 6: 6 → 90
Frame 8: X: 30 (10 + 10 + 10) → 120
Frame 9: X: 28 (10 + 10 + 8) → 148
Frame 10: X 8 1: 19 → 167

Final score: 167

ExampleAll 9/ spares, last bonus ball 9 · 9/ 9/ 9/ 9/ 9/ 9/ 9/ 9/ 9/ 9/9

Frame 1: 9 /: 19 (10 + 9) → 19
Frame 2: 9 /: 19 (10 + 9) → 38
Frame 3: 9 /: 19 (10 + 9) → 57
Frame 4: 9 /: 19 (10 + 9) → 76
Frame 5: 9 /: 19 (10 + 9) → 95
Frame 6: 9 /: 19 (10 + 9) → 114
Frame 7: 9 /: 19 (10 + 9) → 133
Frame 8: 9 /: 19 (10 + 9) → 152
Frame 9: 9 /: 19 (10 + 9) → 171
Frame 10: 9 / 9: 19 → 190

Final score: 190

ExamplePerfect game (12 strikes) · X X X X X X X X X XXX

Frame 1: X: 30 (10 + 10 + 10) → 30
Frame 2: X: 30 (10 + 10 + 10) → 60
Frame 3: X: 30 (10 + 10 + 10) → 90
Frame 4: X: 30 (10 + 10 + 10) → 120
Frame 5: X: 30 (10 + 10 + 10) → 150
Frame 6: X: 30 (10 + 10 + 10) → 180
Frame 7: X: 30 (10 + 10 + 10) → 210
Frame 8: X: 30 (10 + 10 + 10) → 240
Frame 9: X: 30 (10 + 10 + 10) → 270
Frame 10: X X X: 30 → 300

Final score: 300

Each line shows the frame score (with its bonus) and then the running total.

Why a perfect game is 300

Nine strikes in frames 1–9 plus three in the 10th make twelve in a row. Every frame is then 10 + 10 + 10 = 30, and 30 × 10 frames = 300. Eleven strikes followed by 9 pins gives 299.

Reading a scoreboard

Each frame box has small boxes for each ball and a big running total underneath. X is a strike, / a spare, - a miss and F a foul. A box stays blank after a strike or spare until the bonus balls are thrown, which is why this calculator shows “…” there.

FAQ

Add the pins knocked down in each frame, plus bonuses for strikes and spares.

Strike (X): 10 + your next two balls
Spare (/): 10 + your next ball
Open frame: pins from both balls

A strike is only scored after your next two balls. Scoreboards leave that frame empty until then.

Example: X then 7/ makes the first frame 10 + 7 + 3 = 20.

A strike or spare in the 10th frame earns extra balls (two after a strike, one after a spare). Those bonus balls only count toward the 10th frame.

Example: X81 scores 10 + 8 + 1 = 19.

Twelve strikes in a row make every frame 10 + 10 + 10 = 30, and 30 × 10 frames = 300.

X: strike
/: spare
-: miss (0 pins)
F: foul (0 pins)

The small boxes show each ball; the big number underneath is the running total.

Sources

Ten-pin bowling — Scoring — checked October 28, 2026. Strike = 10 + next two rolls, spare = 10 + next roll, 10th-frame bonus balls, 300 = twelve strikes. Cites the USBC rule book.
We did not open the USBC rule book itself; the rules were checked against the article above, which cites it. This calculator uses traditional scoring, not the current-frame scoring used in some international events.

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