Work out sensitivity analysis instantly with clear inputs, formula shown and shareable results.
Sensitivity analysis measures how much the outcome moves for a given move in one input, holding everything else constant. The elasticity ranks which variables matter, and the break-even change — how far the variable can move before the outcome hits zero — tells you how much headroom the plan has.
Elasticity
Elasticity = % change in outcome / % change in variable
Break-even change
Break-even % = -Base outcome / (Change in outcome per 1% move)
To isolate one driver. That is also the limitation: correlated variables move together in reality, which is what scenario analysis addresses.
Anything above about 3 in absolute terms — the outcome amplifies input error threefold, so that variable deserves the best estimate you can obtain.