Marketing Spend Impact Calculator
Project the revenue and profit impact of additional marketing spend at an expected ROAS.
About this calculator
The Marketing Spend Impact Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to project the revenue and profit impact of additional marketing spend at an expected roas. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
Incremental Revenue = Spend × ROAS; Profit = Revenue × Margin − Spend
What you'll need
- Additional Marketing Spend (e.g. 50000)
- Expected ROAS (revenue per $ spent) (e.g. 4)
- Gross Margin (%) (e.g. 60)
What you'll get
- Incremental Revenue
- Incremental Gross Profit
- Net Profit Impact (after spend)
- Marketing ROI (%)
- Verdict
Frequently Asked Questions
What ROAS should I assume? +
Past performance is the best guide. Industry benchmarks: 3× is OK, 4× is solid, 5×+ is strong. For B2B or high-CAC categories, lower can still be profitable if LTV is large.
Why does the calculator subtract the spend twice? +
It doesn't — gross profit (revenue × margin) already includes the cost of goods; we subtract spend once at the end to convert gross profit to net profit impact.