BowlSense Learn

Speed Check: Measure the Shot You Actually Threw

Ball speed and rev rate are two of the fastest ways to understand your game. Speed Check turns a simple bowling video into numbers you can review, repeat, and use.

Speed Check estimates speed and rev rate from the frames you mark in a bowling video. Use it to compare a few ordinary shots and identify a repeatable practice target, rather than treating one throw as a permanent label. Free browser tool Measure your next practice shot Choose a local video, review the frames, and calculate speed or rev rate. The video stays in your browser.

Open Speed Check Choose a clip and check its timing Use a stable camera with the foul line and the landmarks you need visible. For rev rate, follow one recognizable logo, tape mark, or bright spot throughout the measurement. A short, clear clip is easier to review than a whole game. Higher frame rates can give you more observations of a fast rotation.

Load the video and check the timing settings, especially when the camera recorded slow motion. Incorrect recording or playback timing changes the calculation. Review the displayed frame and move through the clip before accepting a mark. Suggestions, where available, are starting points to inspect.

Early lane speed and full lane average Mark the first frame where the ball crosses the foul line, then choose either or both endpoints: Arrows: the first frame where the ball reaches the arrows, approximately 15 feet down the lane. This gives an early lane average. Pin impact: the first visible impact at the pins, using the 60 foot lane interval. This gives a full lane average. Either interval works on its own.

Neither is an instantaneous release speed reading. A ball slows as it travels, so early lane speed, full lane average, and a center's late lane monitor reading can differ without any of them describing the same interval. Compare the same interval across shots. Rev rate: Count rotations Select Count rotations and choose the arc you can recognize: 90°, 180°, 270°, or a full 360° turn.

Mark the start, then mark the same landmark after each selected arc. At 360°, each numbered mark is another full return to the starting orientation. At 180°, for example, the numbered marks represent successive half turns. One observation after the start is enough; further observations are optional. Follow the same landmark and keep the marks in order.

A missed turn or a different logo can produce a plausible looking but incorrect number. Rev rate: Measure angles Select Measure angles , align the needle with your visible ball marker, and use Sample angle to record an observation. Take at least two samples. Continue following the same marker and confirm any extra complete turns between samples so the tool does not confuse a partial turn with a longer rotation.

The angle method reports an estimate and model uncertainty. That uncertainty does not capture every source of error: camera geometry, a misidentified marker, or missed turns can still affect the result. Experimental tracking, when offered, also needs review. Read and share the result Results use the frames and timing settings you accepted.

The speed uncertainty covers frame timing; angle uncertainty covers the angle model. Re mark a questionable result and compare several shots before changing your equipment or practice plan. The share result uses the selected rev method. Review whether you are sharing an early lane average, full lane average, or both, and which rev method produced the number.

A shared result can help a coach or pro shop ask better questions; it cannot guarantee ball motion on a different lane. What stays private The browser page uses a temporary object URL to play your local video. It does not upload the video to BowlSense, store it in your account, or save the clip in local storage. Refreshing the tab clears the loaded clip.