stress - the applied force divided by the undeformed area over which the force is applied.
StressFree Stress Calculator - Solves for any of the 3 items in the stress formula: Stress, Force, and Area
Youngs Modulus-Stress-StrainFree Youngs Modulus-Stress-Strain Calculator - Calculates any of the 3 items in the Youngs Modulus equation with stress and strain.