Four working calculators we use in real client work. No sign-up, no email wall, nothing saved — change a number and the answer changes with it.
Below this return, every rupee of ad spend loses you money. Above it, spending more makes you more. Every budget decision answers to this number.
Start from the revenue you want this month and work backwards to the spend it needs, the orders it implies, and the cost per order you have to hold.
What a subscriber is actually worth over 6 and 12 months at your churn rate — and therefore the most you can afford to pay to acquire one.
Most creative gets killed too early or kept too long. Put in the last 7 days versus the 7 before, and get a plain verdict instead of a hunch.
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