If you are a business Buyer or PM, how much authority do you have to change product specifications?

Very little.
Full authority.

Conversion Calculator

Use the measurement conversion calculator to convert metric units from one unit to another. Simply select the input unit, the output unit, and enter a value to convert from. A value entered in the input field will be converted into the output format and shown in the output field. A value entered in the output field will be converted into the input format and displayed in the input field. Get length measurement conversions, metric area conversions, and more.

Area Conversion
Available Calculators: Area | Bits & Bytes | Density | Energy | Force | Length | Mass | Power | Pressure | Speed | Temperature | Volume