Putting has its own impact and roll considerations; do not use the full-swing tool as a putting predictor.
Putting stroke path describes the putter head’s movement, while start line describes the ball’s initial direction. An in-to-out or out-to-in putter path does not determine start line on its own. This tool projects an entered ball launch direction over a chosen distance; it does not convert putter path into a putt prediction.
Putting start-line geometry calculator
See the lateral offset associated with a measured launch direction on a straight line.
A straight-line projection only; break, pace and surface conditions are excluded.
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width.
How putting stroke path differs from ball start line
Putting stroke path is not interchangeable with the driver face-to-path model. For this calculator, enter a measured ball launch direction and a distance along the intended target line. It projects that direction as a straight line to show the associated lateral offset.
The input is not the putter’s path angle. Face delivery, contact and the putting surface affect the relationship between a stroke and the ball’s start. Using a measured launch direction keeps the calculation tied to the quantity it actually models.
A stroke may follow an arc while the local impact direction differs from the overall visual impression. Use a suitable measurement if you need the putter-path angle. The ball’s initial roll and launch provide separate feedback about the result of face delivery, contact and the surface.
A straight-line projection only; break, pace and surface conditions are excluded.
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width.
See how angular error grows with distance
At 3 m and a launch direction of 1°, the straight-line lateral offset is about 5.24 cm. The calculation multiplies the distance by the tangent of the angle, converting meters to centimeters for the output. Negative launch angles place the projected line on the other side of the reference.
This is not a make-or-miss prediction. Slope, break, pace and the ball’s interaction with the hole are excluded. The figure is useful for understanding why a small angular difference becomes more visible farther from the starting point, not for prescribing an aim point on a real breaking putt.
For a breaking putt, the intended initial aim line may differ from the direct line to the hole. Enter distance and angle relative to the line you are actually studying. The straight projection excludes gravity-driven break, so its offset should not be used as a green-reading adjustment.
A straight-line projection only; break, pace and surface conditions are excluded.
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width.
Build a start-line practice observation
Choose a suitable straight reference and a consistent starting location. Observe or measure the launch direction over a short initial distance, keeping pace and setup as repeatable as possible. If you use a gate, position it so it provides feedback without confusing start line with the later break of the putt.
Record a group rather than judging the stroke from one putt. A repeated start-line pattern can guide the next question about alignment or delivery. Use the target-reference article to understand alignment, while keeping full-swing draw and fade terminology out of the putting calculation.
A start-line gate checks whether a ball passes through a chosen early corridor; a longer roll also reflects pace and slope. Separate these tests. A putt can begin on the intended line and still miss because the read or speed was unsuitable, so do not diagnose stroke path from the final resting point.
Put the idea into practice
- Choose and label the intended initial line on a consistent practice surface.
- Enter observed ball launch direction, not an assumed putter-path angle.
- Use the projection to understand direction, then assess real pace and break separately.
Does an in-to-out putting stroke cause a pushed putt?
Path alone does not determine launch. Face delivery and contact also matter. Observe the initial ball direction rather than inferring it solely from the appearance of the stroke.
Can this tool tell me how much break to allow?
No. It is a straight-line geometry example using distance and launch direction. It has no slope, green-speed or pace inputs and cannot calculate a breaking putt’s route.
A straight-line projection only; break, pace and surface conditions are excluded.
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width.
How to use the results and check the calculation
Start with the labeled example, then replace the inputs with your own observations or chosen comparison values. The controls show the accepted units and range. Changing a value updates the outputs and the linked diagrams throughout this article; each section also lets you adjust one part of the same example.
Lateral offset in cm = distance in m × 100 × tan(launch direction).
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width. Where a visual compares values, it keeps matching units together. Exact numbers appear below the drawing so a schematic scale cannot be mistaken for a measured result.
A straight-line projection only; break, pace and surface conditions are excluded.
The input is ball launch direction, not putter path. The model excludes slope, break, speed and capture width.