What is MOI in Golf Clubs?

Have you ever seen “MOI” written on the bottom of a golf club? If so, you may have wondered what it means. Read on to find out what MOI stands for and how it affects your golf game.

MOI stands for “Moment of Inertia” – a measure of the resistance of a golf club to twisting or bending when it strikes the ball by measuring in grams per centimeter squared. 

MOI in Driver and Fairy Wood

MOI in Driver and Fairy Wood

The MOI of a driver and fairway wood are usually the highest compared to other clubs in the bag. This is because they have larger club heads, enabling golfers to hit further and straighter shots with less effort. In addition, these club heads are designed to be more forgiving for off-center hits.

MOI in Irons and Wedges

MOI in Irons and Wedges

The MOI for irons and wedges is usually lower than that of a driver and fairway wood. This is because these clubs are designed with small head sizes to be more accurate, with little room for error when hitting shots, and helps create control when playing shots around the green. 

When choosing MOI for irons and wedges, you must notice that the higher MOI, the less workability because of the club’s resistance to twisting.

MOI in Putters

MOI in Putters

Putters are designed with the lowest MOI of all golf clubs. The low MOI helps create a more consistent stroke, as there is less resistance when stroking the ball toward the target. Putters with a lower MOI also provide a softer feel off the putter face and can help reduce vibrations for feedback on your swing.

High MOI vs. Low MOI

High MOI  clubs, such as mallet-style putters and modern drivers, have a relatively high resistance to twisting or bending when striking the ball. This results in more forgiveness on off-center shots because less energy is lost in the clubhead twisting.

Low MOI clubs, such as blade-style putters and traditional drivers, have a relatively low resistance to twisting or bending when striking the ball. This results in greater accuracy on well-struck shots because more energy is transferred from the clubhead to the ball.

Benefits of a High MOI

A high MOI club will produce straighter and longer shots even if you don’t strike the ball perfectly each time. The higher resistance to twisting helps you maintain a straighter path with less energy lost in the clubhead twisting. This can help you get more distance and accuracy with each shot.

The increased forgiveness of high MOI clubs also makes them popular for beginning golfers who may still need to perfect their swing. For these players, it is better to have a club that compensates for their swing flaws rather than punish them.

Benefits of Low MOI

To begin with, the lower resistance to twisting helps you achieve greater accuracy with each shot, as the energy is transferred from the clubhead to the ball more efficiently.

Additionally, the decreased moment of inertia allows for more feel and feedback on your shots, which is important for experienced players. The feedback helps you understand what kind of contact you are making with the ball so that you can make the necessary adjustments to your swing and get better results.

Therefore, low MOI clubs are ideal for experienced golfers who want more control over their shots.

Influences of MOI On Shot

Firstly, it affects your ability to hit straight and accurately. The higher the MOI, the more resistant the golf club head is to twisting at impact; therefore, less energy is lost during the swing, and the more forgiving it will be when playing golf. In other words, you can hit straighter shots even if you don’t make solid contact. 

Secondly, the higher the MOI value, the more stable the club head is during your swing. This helps you to maintain a square path through impact and make contact with the ball at the same angle every time.

Finally, high MOI clubs can help you create more distance because the energy from your swing propels the ball instead of twisting or bending the club head.

MOI and Gear Effect

Meta Description: MOI, or Moment of Inertia, is a measure of how much torque it takes to rotate an object around an axis. Learn more about this term and how it applies to golf clubs here!

Gear effect describes the degree to which a golf club will twist on impact with the ball and can influence the trajectory and direction of your shots. Clubs with higher MOI values are more resistant to the gear effect, providing more consistent results from shot to shot.

Choosing MOI in Golf Club

When choosing a golf club, it is important to consider the MOI, as it can affect your performance and accuracy.

Generally, players with slower swing speeds should opt for clubs with higher MOI values since their ball speed will be slower, and they need some help from the equipment.

Conversely, players with faster swing speeds should opt for clubs with lower MOI values as they can generate their ball speed and control the direction of the shot better.


How is MOI Changed?

The MOI of a golf club can be changed by altering the weight distribution in the head. This could include adding or removing weight from certain areas, such as the club head’s back, heel, or sole.

What does Higher MOI Do for Drivers?

The higher the MOI of a driver, the more resistant it is to twisting when hitting shots. This helps create a more stable club head through impact and allows golfers to hit straighter and more accurate shots with less effort.

Does MOI Matter With Irons?

Yes, MOI matters when choosing irons and wedges, as it affects the accuracy of your shots. Higher MOI values will provide more forgiveness on off-center hits, while lower MOI values are better suited to players with faster swing speeds who need increased workability.

Does High MOI Mean More Forgiveness?

A higher MOI generally will result in more forgiveness from off-center hits. The club head is less resistant to twisting on impact and can help maintain a square path through the ball for straighter shots.

How do You Choose MOI?

The best way to choose the suitable MOI for your golf club is to consider your swing speed, accuracy and desired control. Players with slower swing speeds should opt for higher MOI values for more forgiveness, while players with faster ones should opt for lower MOI values for increased workability.

Is There a Limit for MOI?

The shape and size of the club head determine the Limit for MOI. Generally, drivers have a maximum MOI of around 5500g-cm2, while irons can reach up to 8000g-cm2.


In conclusion, MOI is an important factor to consider when choosing golf clubs. It affects the accuracy and forgiveness of your shots and should be taken into account for players of all levels. By understanding how MOI works, you can better select the right equipment for your game and ensure you get the maximum performance out of the course. 

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