Table Tennis Rating Calculator

Work out table tennis rating instantly with clear inputs, formula shown and shareable results.

About Table Tennis Rating Calculator

The rating uses the Elo model: expected score is 1 / (1 + 10 to the power of rating difference over 400), and the change is the K factor times actual minus expected. Because the adjustment is proportional to surprise, beating a much stronger opponent moves a rating far more than beating an equal one.

Formulas

Expected score

E = 1 / (1 + 10 ^ ((opponent rating - your rating) / 400))

Rating change

change = K x (actual score - expected score)

Worked example

With the default values below, Table Tennis Rating Calculator returns New rating of 1,616.9. Change any input above and every figure here is recalculated in your browser.

Inputs used

Your ratingminimum 1: 1,600
Opponent ratingminimum 1: 1,750
Resultone of You won, You lost: You won
K factoraccepts 1–60: 24

Results

New rating: 1,616.9
Rating change: 16.88
Expected chance of winning: 29.66%
Surprise in the result: 0.703

Step by step

1Values used
2Expected score
3Rating change
4New rating= 1,616.9
5Rating change= 16.88
6Expected chance of winning= 29.66
7Surprise in the result= 0.703

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Table Tennis Rating figure worked out?

E = 1 / (1 + 10 ^ ((opponent rating - your rating) / 400)). The rating uses the Elo model: expected score is 1 / (1 + 10 to the power of rating difference over 400), and the change is the K factor times actual minus expected.

Why does this matter?

Because the adjustment is proportional to surprise, beating a much stronger opponent moves a rating far more than beating an equal one.

What do I need to enter?

Enter your rating, opponent rating, result, k factor. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.