What Is One Under in Golf?

Hearing golfers talk about par and being under can feel like learning a new language, but the concept is simpler than you think. Understanding this one idea is the foundation for tracking your score and celebrating your best moments on the course. This guide will walk you through exactly what one under in golf means, how it's scored on your card, and even share a coach's game plan for making more of them.

First, What Does "Par" Mean in Golf?

Before we can go under, we need to know what we're aiming for. Every single hole on a golf course has a "par" number assigned to it. Think of par as the expected or target score for a good golfer on that specific hole. It's the number of strokes (the act of hitting the ball) that a skilled player should take to get the ball from the teeing area into the hole.

How is par determined? It's almost entirely based on length:

• Par 3: These are the shortest holes, typically under 250 yards. The "par" expectation is to get your ball on the green with your first shot (the tee shot) and then take two putts. 1 (tee shot) + 2 (putts) = 3 strokes.
• Par 4: These are the middle-distance holes, usually between 251 and 470 yards. The expectation is one shot to the fairway, a second shot onto the green, and two putts. 1 (tee shot) + 1 (approach shot) + 2 (putts) = 4 strokes.
• Par 5: These are the longest holes, over 471 yards. The par expectation allows for three shots to reach the green, followed by two putts. 1 (tee shot) + 1 (layup shot) + 1 (approach shot) + 2 (putts) = 5 strokes.

So, when you hear "par," just think "target score."

The Simple Answer: What is "One Under Par?"

If you take one less stroke than the target score, you have shot "one under par." In the world of golf, this has a much more common name: a Birdie.

Making a birdie is a fantastic accomplishment and a reason for a mental (or real) high-five with your playing partners. It means you beat the expected score for that hole and moved your total score in the right direction - down!

Let’s look at what a birdie looks like on each type of hole:

• On a Par 3, making a score of 2 is a birdie.
• On a Par 4, making a score of 3 is a birdie.
• On a Par 5, making a score of 4 is a birdie.

Each time you make a birdie, you get to subtract one stroke from your overall score relative to par. For example, if you start your round with a birdie, you are officially "one under" for the day. If you make a score of four (par) on the next hole, you are still "one under" for the round.

How to Mark a Birdie on Your Scorecard

Keeping score in golf is a tradition, and there are a few universal ways golfers notate good (and bad) holes. While simply writing down the number of strokes works perfectly fine, golfers love to add a little flair to highlight their triumphs.

When you make a birdie, here’s how to mark it down:

1. Write the score: In the box for that hole, write down the number of strokes you took. For example, on a par 4, you’d write a "3".
2. Circle it: The universal sign for a birdie on a scorecard is a circle around the number. When anyone looks at your card, they'll immediately see the highlight of your round.

Conversely, for scores that are over par:

• Par: A par is usually just the number itself, with no special marking. Some prefer to just mark a dash ‘-’ or an 'E' for "even".
• Bogey (+1): Making a score of one over par is called a bogey. This is typically marked with a square around the number (e.g., a "5" in a square on a par 4).
• Double Bogey (+2) or worse: Taking two shots over par is a double bogey, often marked with two squares.

The visual of circles on your card is a huge confidence booster, reminding you vividly of the great shots you hit.

A Coach's Game Plan for Making a Birdie

Okay, understanding what a birdie is one thing, but making one requires a plan. A birdie isn't usually the result of one heroic shot, but rather a series of well-planned, well-executed shots. Let’s break down the strategy for giving yourself a birdie chance on a typical par 4.

Step 1: The Tee Shot - Position Over Power

The goal of your tee shot isn't just to smash it as far as you can. It's to place your ball in the best possible position for your second shot. Beginners often get into trouble by a "grip it and rip it" mentality, which can lead them into the trees, bunkers, or deep rough.

Your game plan:

• Identify the safe area: Before you swing, look down the fairway and identify the widest part. That's your target. Avoid trying to "cut a corner" on a dogleg or hitting it too close to fairway bunkers.
• Choose the right club: If you struggle with the driver, don't be afraid to hit a 3-wood or a hybrid. A shot in the fairway 220 yards out is infinitely better than a shot in the woods 260 yards out.
• Smartest play: Hitting the fairway is priority one. This gives you a clean lie and a direct line to the green, which sets up the entire rest of the hole.

Step 2: The Approach Shot - Your Birdie Opportunity

This is where birdie chances are truly created. If your tee shot found the fairway, you now have a shot at the green. Getting your ball onto the green in two shots on a par 4 is called a Green in Regulation (GIR). This is one of the most important stats for better golf because a GIR automatically gives you a putt for birdie.

Your game plan:

• Club up: The biggest mistake amateurs make is under-clubbing and leaving their approach shots short of the green. If you're between clubs, take the longer one and make a smooth, controlled swing. It's almost always better to be a little long than sitting in a bunker short of the green.
• Aim for the center: Don't be a hero. Unless the pin is right in the middle, aim for the heart of the green. Chasing a pin tucked in a corner can lead to big trouble if you miss. A 25-foot putt for birdie is a great result. A chip from a deep bunker is not.
• Execute with confidence: Once you've picked your club and your target, commit to it. A confident, smooth swing will give you the best chance of a solid strike.

Step 3: The Putt - Sealing the Deal

You did it! Your ball is on the green and you officially have a putt for birdie. This is an exciting moment. The key here is not to get ahead of yourself. A good putt requires focus on two things: line and speed.

Your game plan:

• Read the green: Take a moment to walk around your ball and see the putt from different angles. Look for the high point and low point to determine which way the ball will break.
• Focus on speed: For most golfers, speed (or pace) is more important than the line. If you hit the putt with the right speed, it will hold its line better and has a great chance of dropping. More importantly, if it misses, it won't leave you a scary comebacker putt. Practice a few rehearsal strokes looking at the hole to feel the distance.
• Trust your stroke: Once you've read it and felt the speed, step up, aim, and go. A smooth, accelerating putting stroke gives the ball the best roll and the best chance to find the bottom of the cup. And if it drops? Feel free to give a little fist pump. You earned it.

Beyond a Birdie: Golf's Other Great Scores

"One under" is fantastic, but golf has names for even better scores. These are tougher to achieve but are unbelievably satisfying when they happen.

• BIRDIE (-1): One stroke under par on a hole.
• EAGLE (-2): Two strokes under par on a hole. This is typically a score of 3 on a par 5 (reachable in two shots) or a very rare score of 2 on a par 4 (driving the green and making the putt!).
• ALBATROSS (or Double Eagle) (-3): Three strokes under par on a hole. This is the white whale of golf scores. It happens by making a 2 on a par 5 (holing your second shot) or making a hole-in-one on a par 4. It’s so rare that most golfers will play their entire lives without seeing one.

Final Thoughts

In short, scoring "one under" in golf means you’ve made a birdie - a fantastic achievement on any hole. Understanding what par is, planning your shots to hit greens in regulation, and putting with confidence are the fundamental building blocks to creating more of those circled numbers on your scorecard.

Turning a tough tee shot or a tricky approach into a genuine birdie opportunity often comes down to strategy and solid decision-making. Thinking your way around the course is just as important as swinging well. If you ever feel stuck on course management or shot selection, our app, Caddie AI, gives you an on-demand golf expert in your pocket. By analyzing the hole, your yardage, and even your ball’s lie from a photo you take, we can provide instant advice to take the guesswork out of the equation so you can play with more confidence and turn more pars into birdies.