Most commercial tennis racquet head sizes today are 98 or 100 sq inch racquets. But you can find racquets from 89 to 120 sq inches.
To generalize about tennis racquet head size: a smaller head size will offer more control and a larger head size will offer more power and forgiveness. Other factors might affect this, but this is most often the case.
Finding the Best Racquet Head Size
In the world of modern tennis, advanced players looking for control tend to look for 98 sq inch racquets, while most intermediate players do best to look at 100 sq inches or more.
Racquet sizes, on average, have increased over the last 10 years. Almost gone are the so-called mid-size racquets ranging from 85-93 sq inches. But some classics come back from time to time since they are missed by nostalgic players. You can still purchase the legendary Wilson Pro Staff 85 and the HEAD Prestige Classic from Tennis Warehouse.
One racket head size that was the standard ten or 15 years ago, the 95 sq inch racquets, are not common at all among club players, but you can still see them with certain tour players. To name a few, Aslan Karatsev, Andy Murray, Novak Djokovic, Dan Evans, Taylor Fritz.
But even pros want to increase the head size to get more power and forgiveness out of the racquet. In 2014, Federer went from his Pro Staff 90 to a Pro Staff 97, which has become the bestselling Wilson Pro Staff RF97 Autograph model.
Andy Murray tried a 99-inch racquet instead of the 95 he played for his entire pro career. Rublev went from 95 to 100 sq inches a few years back, and Shapovalov recently went from 95 sq inches to 98 sq inches. The game has become faster and more top-spin-oriented, and players are looking for more power, spin, and help from the racquet.
I think most amateur players would also benefit from getting more help from their racquet and strings, one of the ways is to find out your ideal racquet head size.
What Tennis Racquet Head Size Should You Use?
To generalize it, I would structure it like this when it comes to finding the best racquet head size:
Midsize racquets: Highly advanced players
Midplus racquets: Intermediate to advanced (the vast majority of tennis players)
Oversized (and super oversized): Beginners and Veterans