principal
(number): Principal amount
How to use it
principal is exposed by the Calculator Server MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the principal tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
FULL CALCULATOR SERVER LISTINGOther tools in Calculator Server (23)
(array of numbers): Cash flows (negative for outflows, positive for inflows)
(string): Unit category (length, weight, temperature, volume, area)
(array of numbers): Dataset to analyze
(number): Discount rate as percentage
(number, optional): Exponent for pow function (required for pow)
(string): Mathematical expression to evaluate
(string): Source unit
(string): Function name (sin, cos, tan, asin, acos, atan, log, log10, ln, sqrt, abs, factorial, pow, exp)
(number, optional): Future value for some calculations
(array of objects): Loan scenarios with principal, rate, and time
(array of numbers): Numbers to operate on (minimum 2)
(string): "add", "subtract", "multiply", "divide"
(number): Percentile to calculate (0-100)
(integer, optional): Compounding periods per year
(integer, optional): Decimal places (0-15, default: 2)
(number): Interest rate (percentage)
(array of objects): Investment scenarios with principal, rate, and time
(number): Time period in years
(string): Target unit
(string, optional): "radians" or "degrees" for trig functions
(number): Input value (base for pow function)
(array of numbers): Values to convert
(object, optional): Variable name-value pairs