Is this good for hobbyists & makers?

Yes — this version of "Pythagorean Expectation for a badminton smash" is framed for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker.

Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For Hobbyists & Makers · Pythagorean Expectation

Pythagorean Expectation for a badminton smash

Built for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker. Simulate a badminton smash live below — adjust the inputs and watch it respond, right in your browser.

Pythagorean ExpectationLive

wins from points

Controls

Presets

Points/runs scored

Points/runs allowed

Bill James discovered that a team's win percentage tracks the ratio of points scored to points allowed, raised to a sport-specific exponent — the Pythagorean expectation. It predicts records better than actual wins early in a season, exposing teams that are lucky or unlucky and due to regress. The exponent varies from ~1.8 in baseball to ~14 in basketball.

▶ Run in Python

Data Inspector

Expected win %53.2%

Projected wins86 of 162

Exponent1.83

Governing equation

Win% = \frac{75 0 ^{1.83}}{75 0 ^{1.83} + 70 0 ^{1.83}} = 53.2%

Reading this result: A near-even scoring ratio lands close to .500 (53.2%); with an exponent of 1.83, Baseball win % swings sharply once the ratio tilts.

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Frequently asked questions

Is this good for hobbyists & makers?: Yes — this version of "Pythagorean Expectation for a badminton smash" is framed for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.