Studio Happens.
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Ad Spend
Forecaster.

Start from your revenue goal and work back to the ad spend you need, with separate models for ecommerce and lead generation.

100% Free ForeverNo Signup / No LoginD2C & B2B ModesBreak-Even MathWhitelabel Available

E-Commerce Metrics

Work backwards from your goal

₹
₹
₹

Break-Even ROAS

2.50x

Minimum return needed to cover COGS & ad spend.

Required Ad Spend

₹2.00L to ₹2.67L

Targeting 3.8x to 5.0x ROAS to hit your ₹10.00L goal.

Profit Margin

40.0%

Units Needed

500

Daily Budget (Low)

₹6.7K

Daily Budget (High)

₹8.9K

Embed This Tool

Add this professional Ad Spend Forecaster to your agency website or blog. 100% free. No API keys required.

<iframe src="https://www.studiohappens.tech/embed/roi-calculator"...

How to Use the Ad Spend Forecaster

1

Select Your Business Model

Pick 'Product (D2C)' if you sell online. Pick 'Service (B2B)' if you collect leads and close them through a sales team.

2

Set Your Revenue Goal

Enter the revenue you want this month. Everything is worked out backwards from this number.

3

Input Your Margins or Close Rates

For D2C, enter your product price and profit per sale. For B2B, enter your deal size, cost per lead and close rate.

4

Analyze Your Required Spend

You get the ad spend range needed to hit your goal, with a buffer for the B2B learning phase (+20%) and your break-even ROAS.

5

Enable Advanced Mode (Optional)

Flip the toggle at the top right to add CPC, conversion rates, agency fees and customer lifetime value (LTV) for a full P&L.

Why Use This Free Forecasting Tool?

Goal-Oriented Logic

Most calculators ask what $5,000 of ads will get you. This one asks how much you need to spend to reach $50,000 in revenue, which is how finance teams plan budgets.

Model-Specific Math

Ecommerce brands care about margins and ROAS. Service businesses care about close rates and CAC. So there's a separate model for each.

Automated Warnings

If your CAC is too high or your margins are too thin, the tool warns you straight away.

Free Whitelabel Embed

Agencies and freelancers can add this calculator to their own site for free and share it with clients.

Frequently Asked Questions

What is Break-Even ROAS?+
Break-even ROAS is the return on ad spend that exactly covers your ad spend and your product costs (COGS). Below it, you lose money on every sale.
Why is the B2B Service spend 'buffered'?+
Lead generation campaigns go through a learning phase, and lead quality varies. The tool adds a 20-30% buffer to the base spend so you still hit your target when results swing.
What is a good CAC %?+
CAC (cost to acquire a customer) should ideally stay under 10% of your average deal size. Above 25%, your margins shrink fast and you risk losing money.
Can I include my Agency Fees in the calculation?+
Yes. Turn on Advanced Mode to add your monthly agency retainer and customer lifetime value (LTV) to the P&L.
Can I embed this Ad Spend Forecaster on my website?+
Yes. Copy the 2-line embed code at the bottom of the tool and paste it into your HTML. It's free for agencies and freelancers.