Use this calculator to verify a hand calculation, normalize a value before another tool, or make the exact arithmetic convention explicit in a reproducible workflow.

This party's ratio

A finite numeric input.

Sum of all ratios

A finite numeric input greater than or equal to 0.

Total to divide

A finite numeric input.

The formula below determines the tool output. Share: The calculated share.^[1]

Calculations use JavaScript number arithmetic. Binary floating-point representation can make some decimal results inexact, and values outside the supported numeric range can overflow or lose precision. Round only for presentation unless the selected rounding tool is itself the intended operation.

Use the inverse operation to check a result when one exists: addition pairs with subtraction, multiplication with division, and powers with roots. For rounding or normalization tools, retain the unmodified value when later calculations still require full precision.

• Basis Points Calculator

  Convert a percentage to basis points (multiply by one hundred).

• Per Mille to Decimal Converter

  Convert a per mille value (parts per thousand) to its decimal ratio.

• Percentage Points Calculator

  Calculate the difference between two percentages expressed in percentage points.