World Tennis Number (WTN) vs NTRP: What's the Difference?
The World Tennis Number (WTN) is an ITF rating that runs roughly from 40 for beginners down to 1 for elite players, where lower is better. NTRP is a USTA rating from 2.5 to 5.5 in 0.5 steps where higher is better, used mostly for adult league play in the United States. They differ in scale, direction, scope, and how they are calculated, so a high NTRP corresponds to a low WTN, and there is no official conversion between them.
Different scales pointing in opposite directions
The most obvious difference is direction. With NTRP, a bigger number means a stronger player, so a 5.0 is well above a 3.0. With WTN, a smaller number means a stronger player, so a WTN of 5 is far better than a WTN of 25.
The ranges differ too. NTRP spans 2.5 to 5.5 in half point steps and is meant to sort adult league divisions. WTN runs from about 40 down to 1 on a finer scale and is designed to rate players of all ages worldwide.
Different scope and purpose
NTRP is a USTA system focused on United States adult league tennis. It places you in a band so you can be matched with players of similar level for team play.
WTN comes from the ITF and is global. It aims to give one number that works across countries, ages, and competition levels, including juniors. Because the two systems serve different communities, they are not interchangeable and were never meant to convert directly into each other.
How each one is calculated
WTN is built from your actual match results and the closeness of your scores, similar in spirit to other results based ratings. It updates as you play and can move whether you win or lose, depending on how you perform against expectation.
NTRP has both a self rate or computer assigned starting level and a dynamic rating that the USTA updates from league match results during the year. Because both systems lean on results, you can use one as a loose hint for the other, but any crossover figure is an estimate, not an official mapping.
Frequently asked questions
Is a low WTN good or bad?
A low WTN is good. The scale runs from about 40 at the beginner end down to 1 at the elite end, so the lower your number, the stronger you are rated.
Does a 4.0 NTRP have a fixed WTN?
No. There is no official WTN to NTRP conversion. A 4.0 might correspond to a band of WTN values, and the exact figure varies by age and gender, so any single number is only an estimate.
Which rating should a US league player track?
For USTA league play, NTRP is the rating that decides your division. WTN is more useful if you want a global number or play in ITF or international junior events.
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