Bowling Score Calculator

A bowling game consists of 10 frames. In each frame, you get two chances to knock down 10 pins. Your score is the total pins knocked down plus bonuses for strikes and spares. A basic frame scores only the pins you knock down (e.g., 7+2=9). But strikes and spares add bonus points, which is why bowling scoring can seem complex. The maximum score is 300 points (12 consecutive strikes).

A strike is knocking down all 10 pins with your first ball, marked as 'X'. A strike scores 10 pins PLUS your next two balls as a bonus. For example: Strike, then 7 and 2 = 10 + 7 + 2 = 19 points for that frame. This is why consecutive strikes rack up points quickly—a 'turkey' (3 strikes) scores 30 for the first frame alone.

A spare is knocking down all 10 pins using both balls in a frame, marked as '/'. A spare scores 10 pins PLUS your next one ball as a bonus. For example: 7-spare (3 pins + 7 pins), then roll 6 on your next ball = 10 + 6 = 16 points for that frame. Spares are valuable but less impactful than strikes since they only add one bonus ball instead of two.

The 10th frame allows up to 3 balls to complete your bonuses. If you strike, you get 2 more balls. If you spare, you get 1 more ball. If you open (no strike or spare), you're done after 2 balls. A perfect 10th frame is three consecutive strikes (30 points). This design ensures your strikes and spares in the 10th frame can still earn their full bonus value.

Spare conversion rate is the percentage of spare opportunities you successfully convert. For example, if you left pins standing 15 times and converted 12 spares, your rate is 80%. This matters because missed spares (open frames) cost you the 10+ bonus points. Professional bowlers average 85-95% spare conversion. Improving spare conversion is often the fastest way to increase your average score.