数学
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圆周率(π)数字浏览器.
获取圆周率前N位数字，查询任意位置的数字，在圆周率中搜索数字序列，并将数字下载为文本文件。
输入数值
输入时结果会更新。
使用方法
位置计数的是小数点之后的数字：在3.14159…中，位置1是1，位置2是4，位置3是1。开头的3是整数部分，没有位置编号。
本页面收录了圆周率的前10,000位小数。这些数字均通过任意精度整数运算精确计算得出，因此显示的每一位数字都是准确的。
圆周率是无理数：它的小数位既不会终止，也不会形成循环规律，因此22/7和3.14只是近似值，而非精确值。
常见问题
What are the first 10 digits of Pi?
Pi to 10 decimal places is 3.1415926535. The full value is 3.14159265358979323846… — Pi is irrational, so the digits continue forever without ever repeating. This page shows up to 10,000 exact decimal digits.
Does position 1 mean the 3 or the 1?
Position 1 is the first digit AFTER the decimal point, so position 1 = 1, position 2 = 4, position 3 = 1, position 4 = 5. The leading 3 is the whole-number part and has no position. This is the convention used by every major Pi digit table, and it is the one this tool uses.
Can I find my birthday or phone number in Pi?
Often, yes — use the search mode. A 4-digit sequence like 0704 almost always appears within the first 10,000 digits, and 6-digit sequences usually do too. Longer strings may need millions of digits. If a sequence is not found here, it simply does not occur in the first 10,000 digits; it may still appear later.
How accurate are these digits?
Every digit is exact. They were computed with arbitrary-precision integer arithmetic using Machin's formula and verified against an independent higher-precision run, so there is no floating-point rounding anywhere in the dataset.
Why is Pi not just 22/7?
22/7 equals 3.142857…, which matches Pi only to two decimal places. Pi is irrational — it cannot be written as any fraction of two whole numbers — so 22/7, 355/113 and 3.14 are all approximations. 355/113 is the most accurate simple one, correct to six decimal places.
How do I save the digits to a file?
Choose how many digits you want, then click 'Download as .txt'. The file is built in your browser and includes a header noting the digit count and the position convention, so nothing is uploaded anywhere.