German to English Tech/Engineering Engineering (general) Stress Testing

"Die tägliche Erfahrung sagt ohne Berechnung, dass eine hochkant stehende Ellipse eine höhere Steifigkeit aufweisen wird."

This is talking about tensile and compression testing etc. of dental materials. The use of "ohne Berechnung" seems odd here. Does it mean something like "unequivocally"? "Without calculation" sounds odd. "Without estimation" also sounds strange, but with a little lateral thinking, "without estimation" could perhaps mean something like "unequivocally." But if not, what are they on about here with "ohne Berechnung"? TIA for your help.