Your figures
Result
How this calculator works
Break-even analysis splits your costs in two. Fixed costs — rent, salaries, subscriptions — stay the same however much you sell. Variable costs — materials, packaging, transaction fees — grow with every unit. Each sale contributes the price minus its variable cost towards the fixed pile; the break-even point is the number of sales at which the pile is exactly covered. Enter those three figures and, optionally, the volume you actually expect, to see the profit or loss waiting at that level.
The contribution margin is the engine of the whole calculation, and the reason small price changes have outsized effects. Raise the price a little and every unit contributes more, so fewer units are needed; shave the price for a promotion and the required volume climbs steeply. The calculator makes that trade visible before you commit to either move.
Good practice and limits
Classify costs honestly. The repeat offender is the semi-variable cost — delivery, energy, casual labour — booked as fixed because it is easier. Put the part that scales with volume into variable cost, even if you have to estimate it; a break-even point built on flattering buckets is worse than a rough one built on true ones.