Black Friday Calculator
Find out if your Black Friday promotion will actually be profitable. Compares monthly baseline vs BF scenario (discounted price × volume multiplier × residual margin). Shows scenarios from 15% to 50% off side by side and identifies the maximum sustainable discount.
Baseline (normal month)
Total cost: purchase + taxes + packaging
Units per month
Black Friday scenario
Typical BF: 3–10×
% of price that becomes shipping cost
Optional
How to think about the volume multiplier
- • Impulse categories (fashion, beauty): 5–10× in BF
- • Deliberate categories (electronics, furniture): 3–6×
- • Recurring consumption (supplements, pet food): 2–4× (consumption already steady)
- Check your history if you have run BF before. If it is your first time, stay at the lower end — overestimating volume is the most common mistake.
Costs this calculator does not yet consider
- • Extra media investment (use the ROAS calculator for that)
- • Operational costs (extra staff, packaging)
- • Opportunity cost (stock allocated vs other channels)
- • Post-BF impact (customers get used to the discount)
How it works
How to calculate Black Friday profit
The calculator compares your normal month (baseline) against the Black Friday scenario. For each discount it runs: BF profit = (discounted price − cost) × projected units, where units rise by a volume multiplier. The discounted price is full price × (1 − discount), and the residual margin is what's left after the cut. That shows whether the extra volume covers the margin you gave up.
Example: a R$ 200 product costing R$ 120 leaves R$ 80 of margin. With 30% off, the price drops to R$ 140 and margin becomes R$ 20 per unit. If you sold 100 a month and volume triples to 300 during BF, profit goes from R$ 8,000 (baseline) to R$ 6,000: you sold more and earned less. Only with 4x volume (400 units) do you match the original profit.
That's why the tool lays out the 15% to 50% off scenarios side by side and flags the maximum sustainable discount: the one where a realistic volume multiplier still keeps profit above baseline. Discounts that demand impossible volume (5x, 6x) usually mean burning margin for nothing; better to hold at 20% to 30% and protect your cash.
Learn more
Articles to put this tool to work
Inteligência Competitiva na Black Friday: Guia 2026
Como usar inteligência competitiva pra vencer a Black Friday: o que monitorar antes, durante e depois.
Esquenta Black Friday 2025: O Que os Concorrentes Já Estão Fazendo
A 6 semanas da BF, o que apareceu primeiro nos concorrentes monitorados pelo Batedor.
Pós-Black Friday 2025: O Que os Dados Mostraram
BF 2025: profundidade média, frequência de cupom e os 3 padrões competitivos que se repetiram.
Playbook de Black Friday 2026: O Que Mudou e o Que Repetir
Calendário, mecânicas vencedoras de 2025 e os 5 sinais competitivos que valem ouro pra dimensionar profundidade em 2026.
Benchmarks de Desconto por Categoria no E-commerce Brasileiro (2026)
Profundidade média de desconto, frequência de cupom e tipo de mecânica dominante em 8 categorias do comércio eletrônico brasileiro, com base em 480+ lojas monitoradas.
Como Acompanhar Promoções de Concorrentes Sem Perder Tempo
Pare de descobrir promoção de concorrente pelo cliente. Aprenda a automatizar.
FAQ
Frequently asked questions
- What is the Black Friday Calculator?
- It's a free tool that shows whether your Black Friday promotion will actually be profitable. It compares your monthly baseline against the BF scenario (discounted price × volume multiplier × residual margin) and runs 100% in the browser, no signup.
- How do I calculate whether a Black Friday discount is worth it?
- BF profit = (discounted price − cost) × expected volume. The calculator applies this across 15% to 50% off scenarios side by side, factoring in the volume multiplier each discount drives, and pinpoints the deepest discount that still protects your margin.
- What's the difference between the shelf discount and residual margin?
- The shelf discount is the % the customer sees (e.g. 30% off); residual margin is what's left per sale after cost and the discount. A steep discount can sell a lot yet still melt your residual margin — the tool shows both side by side.
- What's the maximum discount I can offer on Black Friday?
- The maximum sustainable discount is the deepest % off that still keeps the BF scenario more profitable than your monthly baseline. The calculator finds that point automatically by weighing the extra volume against the margin you give up at each tier from 15% to 50%.
- Is the Black Friday Calculator free?
- Yes, it's 100% free and runs right in your browser, with no login or install. You enter cost, price, margin and expected volume, and instantly see the discount scenarios compared against your baseline.
