How to Plumb Bob a Putt in Golf

Trying to read the break on a tricky putt can feel like one of the most frustrating guessing games in golf, but there's a classic aiming technique called plumb-bobbing that can give you a true, objective look at the line. This method uses the simple force of gravity to cut through optical illusions on the green and help you putt with more conviction. This guide will walk you through, step by step, how to use this powerful technique and make it a reliable part of your pre-putt routine.

What is Plumb-Bobbing and Why Does it Even Work?

At its heart, plumb-bobbing is simply using your putter as a plumb line - a tool builders have used for centuries to find a perfect vertical line. By letting your putter hang freely from your fingertips, gravity pulls it straight down, creating a dead-straight vertical reference point. The whole idea is to compare this perfect vertical line to the subtle slopes of the putting green.

Our brains are actually very good at detecting what's truly vertical. However, we're not so great at judging subtle tilts on a sprawling, uneven surface like a putting green. Backgrounds, shadows, and the grain of the grass can all play tricks on our eyes. Plumb-bobbing isolates the single most important factor: the slope. It gives your brain a fixed, reliable yardstick to measure against, helping you see the high point and low point of the break with much greater clarity.

Think of it as a reality check for your read. Sometimes what you feel in your feet doesn't quite match what you see with your eyes. Plumb-bobbing is a fantastic way to confirm your initial read or reveal a break that you might have missed entirely. It's not a secret trick, it's just the application of simple physics to help you see the green more accurately.

The Step-by-Step Guide to Plumb Bobbing Your Putt

This process might feel a little awkward at first. Like learning the right grip, it can take a handful of practice attempts before it feels natural. But stick with it, because once it clicks, you'll be able to do it in seconds. Here’s how to do it correctly.

Step 1: Finding Your Dominant Eye is Your Starting Point

Before you even step behind the ball, you need to know which of your eyes is the dominant one. This is non-negotiable for plumb-bobbing because you’ll be closing one eye to get an accurate read. Using the wrong eye will produce an incorrect result every single time.

Here’s a quick test:

• Extend your arms out in front of you and form a small triangle with your thumbs and forefingers.
• Look through this triangle at a small, distant object, like a clock on the wall or a light switch.
• With both eyes open, center the object inside the triangle.
• Now, close your left eye. If the object stays in the frame of the triangle, you are right-eye dominant.
• If the object jumps out of the frame, open your left eye and close your right. If it stays in the frame now, you are left-eye dominant.

Once you figure this out, remember it. From now on, you'll always use your dominant eye for plumb-bobbing.

Step 2: Get in Position and Hold the Putter Correctly

Walk a few paces behind your golf ball so that the ball is directly between you and the hole. You want to be on the exact line of the putt. Stand up straight and relaxed.

Now, hold the putter. This is where most people get it wrong. Do not grip it like you're about to hit a putt. You need a very light, delicate hold. Pinch the very top end of the putter grip between your thumb and forefinger. Just those two fingers. Let the putter head's weight cause the entire club to hang straight down toward the ground. It should dangle freely, able to sway slightly if there's a breeze. Make sure your arm is relaxed and slightly away from your body so the shaft can find its true vertical hang.

Step 3: Line it Up with the Ball

Now, with your putter hanging freely, close your non-dominant eye. Keep your head level - don't tilt it.

From the perspective of your dominant eye, move your hand slightly so that the vertical putter shaft lines up perfectly and covers up your golf ball. From your view, the ball should be completely hidden behind the putter shaft. Now hold that position steady.

Step 4: Read the verdict

This is the moment of truth. With the putter shaft still covering the ball, look at where the hole is in relation to your vertical putter shaft. There are only three possibilities.

• If the Hole Appears Left of the Putter Shaft: This means the ground slopes downhill from right-to-left. Therefore, your putt will break to the left.
• If the Hole Appears Right of the Putter Shaft: This means the ground slopes downhill from left-to-right. Therefore, your putt will break to the right.
• If the Hole is Perfectly Covered by the Shaft (Just like the ball): The putt is straight. Don't second guess it - hit it right at the cup.

Here’s a helpful way to think about it: the hole will always appear on the "downhill" side of your perfect vertical line. So, if the hole peeks out to the left side of the shaft, left is downhill. If it peeks out on the right, right is downhill. The plumb bob visual is revealing which side of the line is the low side.

Common Plumb Bobbing Mistakes and How to Fix Them

If you're getting inconsistent reads, you're likely making one of these common mistakes. The good news is they are all easy to fix.

• Gripping Too Tightly: If you use more than your thumb and forefinger or clench them tightly, you're influencing how the putter hangs. It won't be truly vertical. The Fix: Relax. Imagine you're holding a delicate piece of string and just letting the weight at the bottom do the work.
• Using the Wrong Eye (or Both): Using your non-dominant eye or keeping both open creates parallax error. This will distort your perception and give you a false read. The Fix: Commit to the dominant eye test and stick with using only that eye for your read.
• Tilting Your Head or Body: If you tilt your head, you're tilting your built-in balancing system (your inner ear) and compromising your brain's ability to recognize a true vertical line. The Fix: Stand up tall and straight. Keep your head as level as possible throughout the process.
• Standing Off-Line: If you aren't directly behind the ball on the line of the putt, your geometric reference will be incorrect. The Fix: Take a moment to position yourself precisely behind the ball before you even start the plumb-bobbing process. You can even line up the logo on your ball with the hole to give yourself a clear line.

When and Where is Plumb-Bobbing Most Effective?

Plumb-bobbing is a fantastic tool, but it's not the right play for every single putt. Understanding where it shines will help you use it most effectively.

Its sweet spot is on putts inside about 20 feet that have a single, definitive break. It is particularly good for those tricky, subtle side-hill putts where you’re not quite sure if it's breaking or not, or by how much. It's a great final check to add certainty to your read.

It's less effective on a few types of putts:

• Long, Lag Putts: On a 40-foot putt, there are often multiple or compound breaks. Plumb-bobbing from behind the ball will only show you the overall slope from your position, not the smaller ridges or valleys along the way. For these, feeling the slope in your feet as you walk the line is often more valuable.
• Severe Uphill or Downhill Putts: When a putt has an extreme uphill or downhill slope, speed becomes a much more important factor than the line. While you can still plumb bob to check the side-to-side break, your primary focus should be on pace.

Finally, a word on pace of play. Once you get the hang of it, the entire plumb-bobbing process should take no more than 5-10 seconds. It should be a quick check that integrates smoothly into your routine, not a long, drawn-out calculation that holds up your group.

Final Thoughts

Plumb-bobbing is a straightforward technique that uses gravity to give you an objective, reliable read on a putt's break. By adding it to your green-reading process and practicing the steps, you can eliminate a lot of the visual guesswork, leading you to trust your line and make a more confident stroke.

We believe that understanding the "why" behind techniques like this is how you become a smarter, more confident golfer. That's why with Caddie AI, we put an on-demand golf expert in your pocket. If you're on the course fighting a tricky lie, have a question about strategy, or just want to understand a golf concept better, you can get a clear, simple answer in seconds - helping you take the uncertainty out of your game and focus on hitting great shots.