Quick guide
How to use this calculator
- Enter one factor per line or separate factors with semicolons.
- Use leading signs when factors are negative.
- Read the exact product, factor count, and sign information.
- Copy the complete result when needed.
Calculation method
Exact multiplication across a list
The calculator multiplies integer coefficients and adds decimal scales, avoiding floating-point approximation.
An odd number of negative factors gives a negative product; an even number gives a positive product. If any factor is zero, the exact product is immediately zero.
Worked example
Multiply −1.5, 2, and −3
Two negative factors produce a positive result, and the decimal scale is retained exactly.
(−1.5) × 2 × (−3) = 9.0
Supported inputs
Precision and limits
Factor count
Enter between 2 and 100 factors.
Exact decimals
Each factor may contain up to 200 digits and 100 decimal places.
Controlled size
Inputs and the exact fixed-decimal display are limited to 2,000 digit characters.
Unambiguous separators
Use line breaks or semicolons; grouping commas are not accepted.