套餐

科学记数法转换器

把非常大或非常小的数写成科学记数法，或把它们转换回普通数。

结果

输入数值并点击“计算”查看结果。

公式

x=a×10n,1≤∣a∣<10x = a \times 10^{n},\quad 1 \le |a| < 10

a has exactly one non-zero digit before the decimal point; n counts how far the point moved.

如何使用此计算器

  1. Choose which way to convert.
  2. Enter the number (or a and n) and press Calculate.

例题

Writing 0.000345 in scientific notation

Move the decimal point 4 places right to get 3.45.

So 0.000345 = 3.45 × 10⁻⁴.

常见问题

When is the power of ten negative?

When the number is smaller than 1: the decimal point moves to the right.

What does 3.45e-4 mean?

It is calculator shorthand for 3.45 × 10⁻⁴.