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Rock Paper Scissors Odds Calculator

Free online rock paper scissors odds calculator. Enter your values and get instant results with the formula, step-by-step working, a worked example and FAQs — everything runs locally in your browser on Calcton, no signup required.

中文版:剪刀石头布概率计算器

Rock Paper Scissors Odds Calculator
你输时的损失 a(正数)
你赢时的收益 b(正数)

原理:剪刀石头布是循环占优的零和博弈——没有纯策略均衡,唯一均衡是混合策略。当赢收益 a 与输损失 b 不对称时,均衡仍是三种手势等概率(各 1/3),但博弈值 v = (b − a)/3 会偏向收益占优的一方。

步骤:① 输入赢收益 a 与输损失 b;② 点击计算;③ 读出三种手势的均衡概率与期望收益。

示例:标准对称情形 a = 1、b = 1 时 v = 0,公平游戏;若输要赔 2、赢只得 1(a = 2、b = 1),则 v = -0.333333333333,每局期望亏 1/3——别玩这种盘口。

注意事项:等概率均衡对任何 a、b 都成立(循环结构使然),不对称盘口改变的是期望值而非混合比例;人类对手并非随机机,针对对手习惯的剥削性策略短期有效但会被反剥削;本工具假设对手按均衡出招。

相关:零和博弈计算器给出 2×2 情形的混合概率公式;纳什均衡计算器解释无差异条件;期望值计算器是混合策略期望收益的底层工具。

How to use the Rock Paper Scissors Odds Calculator

  1. Fill in the inputs with your own numbers — every field shows what it expects.
  2. The result updates instantly as you type; no "Calculate" click needed.
  3. Read the result card for the main figure, the step-by-step formula, and practical notes.

Frequently asked questions

Is the Rock Paper Scissors Odds Calculator free?

Yes — all math calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.

Is there a Chinese version of this tool?

Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.

References

Formulas and benchmarks used by this calculator follow these published sources.

  1. dlmf.nist.gov
  2. mathworld.wolfram.com
Kevin's profile

KevinContent LeadCalcton Editorial Team · Last updated 2026-10-05

Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.

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