\begin{tabular}{@{}lrrrcr@{}}
\toprule

\thead{Ingredient}&               & \thead{Percentage}  & \thead{Calculation}            &  &                     \\ \midrule
Flour             & \qty{1000}{g} &\qty{100}{\percent}  & \qty{1000}{g} of \qty{1000}{g} &is& \qty{100}{\percent} \\ 
Water             & \qty{600}{g}  & \qty{60}{\percent}  &  \qty{600}{g} of \qty{1000}{g} &is&  \qty{60}{\percent} \\ 
Sourdough starter & \qty{100}{g}  & \qty{10}{\percent}  &  \qty{100}{g} of \qty{1000}{g} &is&  \qty{10}{\percent} \\ 
Salt              &  \qty{20}{g}  &  \qty{2}{\percent}  &   \qty{20}{g} of \qty{1000}{g} &is&   \qty{2}{\percent} \\ \bottomrule
\end{tabular}