Free marketing calculators and audit tools.
Growthmak publishes 5 free marketing tools that run in your browser, cover 4 of the calculations that decide whether spend is profitable, and ask nothing of you before they give you an answer. Every one of them states the formula it uses, because a confident number produced by a hidden calculation is worth less than no number at all.
5 free marketing tools, and what each one answers
Each card below leads with the question the tool was built to answer, so you can go straight to the one that matches what you are trying to find out today. All five open immediately and none of them puts a form in front of the result.
Most usedGrowth Engine ROI Calculator
How do I work out the ROI of fixing my marketing funnel?
Nine questions about how your marketing actually runs today. You get the monthly cost of the leak, which of the five layers is causing it, and the twelve-month ROI of fixing it.
- Finding which of the five layers is costing you the most, before you brief anyone.
- Putting a monthly figure on a problem you can currently only describe.
- Taking a costed, layer-by-layer case to the person who signs off budget.
CalculatorMeta Ads Budget Calculator
How much should I spend on Meta ads?
Estimate what your next Facebook or Instagram campaign should cost. Enter your goal, timeline, and lead target, and the calculator returns a working budget based on current Meta advertising benchmarks.
Open the tool
CalculatorGoogle Ads Budget Calculator
How much should I spend on Google Ads each month?
Plan your Google Ads spend around the results you want. Enter your target clicks or conversions and expected CPC to calculate the monthly budget and daily spend your campaign may require.
Open the tool
CalculatorEcommerce Profitability Calculator India
How do I work out if my e-commerce product is profitable in India?
Calculate your real ecommerce profit per order. Enter your product costs, marketplace fees, shipping, returns and GST to see your net profit per unit and the break-even volume each selling price needs.
Open the tool
ChecklistGMC Misrepresentation Audit Checklist
Why was my Merchant Center account suspended for misrepresentation?
Check your store against the policies behind most Google Merchant Center misrepresentation suspensions. Work through six areas covering business information, website trust, policies, product data, pricing transparency, and secure checkout.
Open the toolWhich free marketing tool should you use?
Use the Growth Engine ROI Calculator when you know performance is poor but cannot yet say which part of the funnel is responsible for it. Use one of the channel tools when you have already narrowed the problem down and need the arithmetic on budget, break even ROAS or unit economics.
| Tool | Use it when | What it returns | Time |
|---|---|---|---|
| Growth Engine ROI CalculatorCalculator | Finding which of the five layers is costing you the most, before you brief anyone. | A monthly cost for the leak, the layer causing it, and a twelve month ROI projection for fixing it. | About 90 seconds |
| Meta Ads Budget CalculatorCalculator | Sizing a campaign before it runs, from the result you need rather than a round number. | An estimated campaign budget, the daily spend it implies, and the cost per result behind it. | About 2 minutes |
| Google Ads Budget CalculatorCalculator | Setting a monthly budget from a click or conversion target. | A monthly budget and the daily budget to enter in the account. | Under a minute |
| Ecommerce Profitability Calculator IndiaCalculator | Deciding what to price a product at before you list it. | Net profit and break-even units for each price point, after GST, fees and fixed costs. | About 5 minutes |
| GMC Misrepresentation Audit ChecklistChecklist | Preparing an appeal after a misrepresentation suspension. | A completed audit across 45 checks in six sections, with your own notes against each. | About 20 minutes |
Free, and not a lead magnet
What is a marketing ROI calculator?
A marketing ROI calculator is a tool that turns what you spend and what that spend produces into a return figure you can actually act on. Most of them stop at revenue, which flatters any business that carries a real cost of delivery, so the calculators on this page carry the arithmetic through to profit and tell you the break even point your margin genuinely requires.
Why do these tools show their formulas?
Every tool here states the calculation it is running, because a number you cannot check is a number you cannot take to anyone who controls a budget. If a result surprises you, you are able to see exactly which input produced it and change that input rather than distrusting the whole answer.
What happens to the numbers you enter?
Nothing happens to them, because the calculations run in your browser and the figures never reach a Growthmak server. There is no account to create and no download waiting behind a form, so you can use any of these tools with real commercial numbers rather than rounded ones.
How do these tools relate to the Growth Engine?
Each calculator measures one part of the same system that the Growth Engine is built to fix, which runs from foundation and traffic through conversion, operations and social proof. The ROI calculator works across all five layers at once, while the channel tools give you a precise reading on a single one of them.
Questions about the free tools
Yes, all five tools are free to use and none of them asks you to create an account. They run entirely in your browser, so your numbers are never sent to us and nothing is stored after you close the tab. The one exception is the Growth Engine ROI Calculator, which asks for an email address only at the point where you choose to have the full written report sent to you.
Break even ROAS is one divided by your contribution margin, expressed as a ratio. If every hundred pounds of revenue leaves you thirty pounds after cost of goods, fulfilment and payment fees, your contribution margin is thirty percent and your break even ROAS is roughly 3.3. Both the Meta Ads Dynamic Budget Calculator and the Ecommerce Unit Economics Calculator work this figure out for you from the costs you enter, which matters because deriving it from gross margin alone is the most common reason a store scales into a loss.
No, the tools are open to anyone and there is no obligation attached to them. If you want the output interpreted rather than just calculated, you are welcome to bring it to the free growth diagnostic, where we go through what the numbers imply for your particular funnel.
Start with the Growth Engine ROI Calculator if you know something is wrong but cannot yet say which part of the funnel is causing it, because it works across all five layers and tells you where the money is going. Use one of the channel calculators instead when you already know the channel you are questioning and simply need the maths on budget, break even ROAS or unit economics.
Your monthly Google Ads budget is whichever pair of numbers you already have, multiplied out and then divided across the days in the month. The Google Ads Budget Calculator will take clicks and cost per click, or conversions and cost per acquisition, or conversions with a conversion rate and cost per click, and return both the monthly figure and the daily budget that the account interface actually asks you to enter.
Every tool here runs in your browser.
Nothing is emailed to you and nothing is stored, so bring the output to the free diagnostic if you would like it interpreted rather than only calculated.
See the engine30 min
One session, no obligation
1 day
Written plan back to you
9
Markets we operate in
If the numbers are not adding up, that is what the diagnostic is for.
A free 30-minute session that establishes what is actually limiting growth, before anyone proposes anything. You leave with a written plan whether or not you work with us.
- Where your funnel is losing qualified buyers, with the evidence.
- Which layer to fix first, and what it is costing you to leave it.
- Whether you need a build, an operator, or neither right now.
- A written plan you keep, with no obligation attached.