The antonyms for the word "un calculable" are "measurable," "calculable," and "determinable." These words suggest that the value, worth, or significance of something can be quantified or estimated in some way. Measurable implies that a value can be obtained through observation or calculation, while calculable suggests that a value can be estimated through mathematical procedures. Determinable, on the other hand, implies that a value can be ascertained through investigation or analysis. In general, antonyms for "un calculable" convey a sense of confidence in our ability to measure, quantify, or otherwise comprehend the world around us.