Open and calculate
Each tool is one page. Enter the numbers and the result updates.
Court-side
Amateur tennis tools you can open and use
A level check, a scoreboard, racket conversions, training burn, and the four Grand Slams. The math stays on this device.
Five tools
01NTRP-style
Level test
Eight self-rating questions, mapped to an amateur 1.5–4.5 band.02One or three setsScoreboard
Games, sets, tiebreaks, break point, and undo. A refresh keeps the match.03Both directionsRacket calculator
Grams and ounces, balance, string tension, and a swingweight estimate.04Five sessionsTraining calculator
Estimate calories from the session, plus a simple practice score.05CalendarSlam countdown
Australian Open, French Open, Wimbledon, and the US Open in your time zone.Use it and leave
Kept on this device
There is no account. The score and language choice live in this browser.
Two addresses
Chinese lives under /zh and English under /en, so each can be indexed.
Before you start
Do I need an account?
No. Open the page and calculate.
Is the level test an official NTRP rating?
No. Eight self-rating answers map to 1.5–4.5 for practice planning. An official rating is done in person or in a league.
Where is the score stored?
In this browser. A different device, or clearing site data, starts a new match.
How do I switch language?
Use the language control in the header. The choice is remembered the next time you open the home page.