Free tool
Most budgets are set by what is left over. This runs the sum the other way: the target you want, divided by how your site actually converts, gives the spend it takes to get there — and tells you when the target is not reachable at all. Nothing leaves your browser.
Same revenue target, one input changed. This is where the cheapest win usually is.
| If this changed | Budget becomes | You save |
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How to read it
If the budget it gives you costs more than the profit the revenue carries, the target is not reachable at that conversion rate and cost per click. Raising spend will not fix it; it will only lose the money faster. Fix the site or the offer first.
Budget moves in a straight line with conversion rate. Going from 2% to 2.5% cuts a fifth off the spend needed for the same revenue, every month, for as long as the site stays fixed. That is usually cheaper than buying a fifth more clicks.
Google and Meta take a daily figure and can overspend it on any given day, evening out across the month. Set the daily number this gives you and check the monthly total, not each day's.
This assumes your cost per click stays flat. It rarely does — the cheapest audience gets used up first, so doubling spend usually buys less than double the clicks. Treat the answer as a floor for the first month and re-check with real figures after that.
If the conversion rate is what is stopping you, that is a web design and conversion job. If you want to check whether your current spend is already profitable, use the ROAS calculator.
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Second opinion
Press the button above and your figures drop straight into this form.