- Enter
**x**or**X**for a strike. - Enter
**/**for a spare. - Enter
**0-9**for each shot if it is not a strike or spare. - The cursor will auto-advance to the next shot (or next frame in case of a strike).
- Use the bottom row of textboxes to test your scoring knowledge against the actual score.

Almost everyone has been bowling, but do you know how to keep score if there isn't a computer there to do it for you? It's pretty simple, and I will explain the rules here along with an example of a real game.

Above is a bowling score calculator. You can enter in values to simulate a game and click "Calculate Score" to see the results. To test your scoring abilities, you can enter in the score for each frame in the bottom row of textboxes to see if they match the actual scores.

If you knock down all 10 pins in the first shot of a frame, you get a
strike.

__How to score:__ A strike earns 10 points *plus the sum of your next two
shots.*

**Spare**

If you knock down all 10 pins using both shots of a frame, you get a spare.

__How to score:__ A spare earns 10 points *plus the sum of your next one
shot.*

**Open Frame**

If you do not knock down all 10 pins using both shots of your frame (9 or
fewer pins knocked down), you have an open frame.

__How to score:__ An open frame only earns the number of pins knocked down.

**The 10th Frame**

The 10th frame is a bit different:

If you roll a strike in the first shot of the 10th frame, you get 2 more
shots.

If you roll a spare in the first two shots of the 10th frame, you get 1 more
shot.

If you leave the 10th frame open after two shots, the game is over and you do
not get an additional shot.

__How to Score:__ The score for the 10th frame is the total number of pins
knocked down in the 10th frame.

**Frame 1:**

You got a spare. Your score is 10 plus the number of pins you knock down in
your next shot. In this case it is 5, so you have 15 points in Frame 1.

**Frame 2:**

You have an open frame of 9 points. Add 9 to your previous score (15), and you
have 24 points in Frame 2.

**Frame 3:**

Another open frame of 9 points. Add 9 to your previous score, and you have 33
points in Frame 3.

**Frame 4:**

Strike! You earn 10 points plus your next two shots. In this case, your next
two shots are a strike and a 5 which is a total of 15 pins. So, 10 + 15 = 25
points earned for Frame 4. Add 25 to your previous score, and you have 58 in
Frame 4.

**Frame 5:**

Strike again! You earn 10 points plus your next two shots. In this case, your
next two shots are a 5 and a spare (another 5), which is a total of 10 pins.
So, 10 + 10 = 20 points earned for Frame 5. Add 20 to your previous score, and
you have 78 in Frame 5.

**Frame 6:**

Spare! You earn 10 points plus your next shot. In this case it is 5, so you
have 15 points in Frame 6. Add 15 to your previous score, and you have 93 in
Frame 6.

**Frame 7:**

You have an open frame of 8 points. Add 8 to your previous total, and you have
101 in Frame 7.

**Frame 8:**

You have an open frame of 9 points. Add 9 to your previous total, and you have
110 in Frame 8.

**Frame 9:**

Spare! You earn 10 points plus your next shot. In this case, your next shot is
a 9, so you have 19 points in Frame 9. Add 19 to your previous score, and you
have 129 points in Frame 9.

**Frame 10:**

Last frame. You got a spare in the first 2 shots, so you roll again and get a
strike. Remember, your score in Frame 10 is the total number of pins knocked
down. In this case, you knocked 20 pins down. Add 20 points to your previous
score, and you have 149 points for the game!

A spare followed by a strike earns 20 points in a frame.

The maximum score in one frame is 30 which is achieved by rolling 3 consecutive strikes.