B2B ROI Calculator

Marketing ROI Calculator

Spend, leads and close rate → ROI, CPL, CAC and break-even CAC. Transparent formula, exportable PDF & CSV report — free, no signup to calculate.

Advanced inputs & assumptions
How is this calculated?
  • totalSpend = spend + extraToolCost
  • customers = leads × leadToCustomer% × scenario
  • monthlyGain = customers × customerValue × margin%
  • ROI% = (monthlyGain − totalSpend) / totalSpend × 100
  • CAC = totalSpend / customers · break-even CAC = customerValue × margin%

Year-1 customer value is recognised in the acquisition month (see methodology).

Full methodology & default values →

Example with demo defaults — adjust to your numbers

Marketing ROI 180.0%
Customer acquisition cost $500
Break-even CAC $1,400
Cost per lead $50
CAC payback 5 mo

ROI by scenario

Cons124%Expe180%Aggr236%

36-month cumulative net gain

break-even12mo24mo36mo

Frequently asked questions

How is marketing ROI calculated?

We turn your monthly leads into customers using your lead-to-customer rate, value each at their year-one revenue times gross margin, and compare that monthly gain to your spend. We also return cost per lead, CAC and the break-even CAC (the most you can spend per customer and still profit).

What is a good marketing ROI?

A common rule of thumb is that customer value should comfortably exceed CAC, but the right target depends on your margin and payback tolerance. Use the break-even CAC this tool outputs as your ceiling, and compare ROI across campaigns with consistent assumptions.

How is CAC payback calculated here?

CAC payback is your customer acquisition cost divided by the monthly gross margin a customer generates (year-one value × margin ÷ 12). It tells you how many months of margin it takes to earn back what you spent to acquire each customer.

Where do the default values come from?

The pre-filled numbers are demonstration defaults that produce a realistic example — they are not claimed industry averages. Replace them with your own figures for an accurate result. Where a field is labelled as an assumption, adjust it to match your business; the methodology page lists every default and its status.

Is my data stored anywhere?

Calculating stores nothing: every calculation runs in your browser, there is no account, and nothing you type is sent while you calculate. Only if you download the PDF report do we receive the work email you enter plus a short summary of the inputs you modelled, so we can follow up — the privacy page states exactly what is kept.