Glicko Rating Calculator

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

About Glicko Rating Calculator

Glicko adds a rating deviation to Elo: the g function shrinks the expected score toward a draw when uncertainty is high, and the deviation itself falls as games are played. Because uncertain ratings move further, Glicko settles a new player's rating in far fewer games than plain Elo with a fixed K factor.

Formulas

Attenuation

g(RD) = 1 / sqrt(1 + 3 q^2 RD^2 / pi^2), with q = ln(10) / 400

Rating update

new rating = rating + q x g x (score - expected) / (1 / RD^2 + q^2 g^2 E (1 - E))

Worked example

With the default values below, Glicko Rating Calculator returns New rating of 1,598.4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Your ratingminimum 1: 1,500
Your rating deviationaccepts 1–350: 200
Opponent ratingminimum 1: 1,600
Your scoreaccepts 0–1: 1

Results

New rating: 1,598.4
New rating deviation: 180.9
Expected score: 38.08%
Rating change: 98.44

Step by step

1Values used
2Attenuation
3Rating update
4New rating= 1,598.4
5New rating deviation= 180.9
6Expected score= 38.08
7Rating change= 98.44

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 2 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 Glicko Rating figure worked out?

g(RD) = 1 / sqrt(1 + 3 q^2 RD^2 / pi^2), with q = ln(10) / 400. Glicko adds a rating deviation to Elo: the g function shrinks the expected score toward a draw when uncertainty is high, and the deviation itself falls as games are played.

Why does this matter?

Because uncertain ratings move further, Glicko settles a new player's rating in far fewer games than plain Elo with a fixed K factor.

What do I need to enter?

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