If you describe the value, benefit, or importance of something as inestimable, you mean that it is extremely great and cannot be calculated. Human life is of inestimable value = incalculable. too much or too great to be calculated
beyond calculation or measure; "of incalculable value"; "an incomputable amount"; "jewels of inestimable value"; "immeasurable wealth"
Incapable of being estimated or computed; especially, too valuable or excellent to be measured or fully appreciated; above all price; as, inestimable rights or privileges