Tables and lookup.

Units live in the column header, so a cell is a real quantity. Pick a row and the value it publishes feeds everything below it.

Sheaf MER-2418-B12 · Meridian Engineering RT
Meridian Engineering · universal beams, S275. The selected row publishes its values to the check below.
Section hmm Wplcm³ Acm² UB 305×165×40 303 623 51.3 UB 356×171×45 351 775 57.3 UB 406×178×54 403 1055 69.0
Wpl≔ selected row = {{ wVal }} cm³
fy≔275N/mm²
γM0≔1.00
MRd≔ Wpl·fy γM0 = {{ mVal }} kN·m