PROFITABLE GROWTH SIMULATOR

How much can you spend on advertising before profit disappears?

This tool walks you through the real growth decision, step by step:

• Where am I today?
• What happens if I spend more?
• How much additional revenue do I need to justify it?
• Does that actually make me more profitable?
• Should I scale, or pull back?

Once you account for gross margin and fixed costs, a clear line appears: below it you're profitable, above it you're not. As revenue grows that line moves, so this simulator connects your marketing metrics to your economics to show where you can profitably scale.

MER (Marketing Efficiency Ratio) measures how much of your revenue is spent on advertising.

Spend $15 on ads to generate $100 in revenue? Your MER is 15%. It's a useful benchmark, but a 15% MER can be highly profitable for one business and unprofitable for another. The difference comes down to gross margin, fixed costs, and scale.

The map below plots every daily ad-spend × revenue combination and the MER it produces. Green is efficient, red is heavy. Tap or hover any cell to see how the same MER shows up across many spend/revenue pairs.

// The interactive MER map is best on desktop. Scroll down to run your numbers.

Set your gross margin, fixed costs, and OpEx, then build your current plan as Scenario A. Work in whichever unit you think in: edit daily or monthly, edit spend or revenue, and everything stays in sync.

Add Scenario B above with a higher spend, and this section answers the three questions that follow: how much extra revenue the new spend needs to break even, whether profit actually goes up, and what revenue it would take to hold your current profit.

Blended MER counts every revenue dollar. aMER (acquisition MER) counts only what you spend to win new customers, the truer read on growth. Set your new-customer share and a target aMER. This uses Scenario A's spend and revenue.

Set the monthly contribution margin you want (revenue × gross margin − ad spend) and see the paths that get there. Same goal, different mixes of efficiency, spend, and revenue. Uses the Gross Margin set above. Drag the slider or type any number.

Every row hits the same contribution margin. Lower efficiency (higher MER) is viable, it just requires more revenue and more spend to get there.

Start with the monthly net profit you want after fixed costs & OpEx. Same idea, many paths to the same bottom line. Uses the Gross Margin, Fixed Costs, and OpEx set above. Drag the slider or type any number.

Every row nets the same profit after all costs. Higher-MER paths simply need more revenue and spend to clear the same bottom line.

Your answer is in the read on your plan at the top, and in your Distance to Breakeven on each scenario. Positive distance means room to scale before efficiency becomes the limit. Negative means pull back or improve efficiency. Switch planning modes to reframe the read for revenue, profit, or scaling.

// Doesn't model diminishing returns, channel saturation, or cash-flow timing. Pair with incrementality analysis.