How many units (or how much revenue) you need to cover fixed costs. Plus what hitting a target profit takes, and how much margin of safety today's sales give you.
Most small businesses recompute break-even once at startup and never again. Then a subscription doubles, materials go up, a salaried hire lands — and the number quietly drifts. Verticals like DealDesk, GearShift, and SiteLine surface contribution margin in the dashboard so you see it move in real time, not at year-end.