Start with a sale your business can deliver profitably. Then test whether demand, acquisition costs and cash flow support the target within an acceptable risk limit.
How much should we spend on advertising? A defensible answer needs three inputs: contribution per sale, available capacity and a reliable process for handling inquiries.
An industry average can provide context, but it cannot replace your economics. The example below is hypothetical, uses USD consistently and does not represent Patagonia pricing or typical market results.
Define a sale you can actually fulfill
Specify the offer, market and test period, then check staffing, inventory or appointment capacity. Twenty additional orders are not useful if you can deliver only ten at the promised standard.
Choose a clear unit such as a completed job or fulfilled first purchase. Separate realized revenue from expected future customer value. Define a valid inquiry and who will respond before selecting the conversion action.
Separate media, management and setup
Build the total test cost before estimating clicks. Separate platform spend, management and creative production, and one-time preparation such as a landing page or tracking setup.
Confirm taxes, currencies and payment timing. Advertising bills may arrive before customer payments. Reserve preparation costs before allocating the entire budget to media.
Calculate a limit from gross margin
Suppose a service business can fulfill 12 additional sales at $1,000 each, with a hypothetical 40% gross margin after direct service costs. Revenue would be $12,000 and gross margin $4,800.
If it wants to retain $1,800 before other overhead and taxes, advertising plus management cannot exceed $3,000. Subtract hypothetical management fees of $600 and media spend is limited to $2,400. This assumes the website, creative and tracking are ready; additional setup reduces the available amount.
Work backward from sales to inquiries and clicks
At a 20% close rate, 12 sales require 60 qualified inquiries. If 5% of clicks become those inquiries, the model requires 1,200 clicks. A $2,400 media budget therefore supports a $2 average CPC and $40 in media cost per qualified inquiry. Including management, the cost is $50 per inquiry.
Use the same qualification stage in both rates. Do not apply a close rate from qualified opportunities to every form submission. Compare the model with relevant account history and Keyword Planner estimates, which are forecasts rather than guarantees.
Test a downside scenario
If CPC rises to $3 with other assumptions unchanged, $2,400 buys 800 clicks, producing 40 inquiries and eight modeled sales. Gross margin becomes $3,200, leaving $200 after media and management.
If the close rate instead drops to 10%, the original 1,200 clicks produce six sales. Gross margin is $2,400 against $3,000 in acquisition costs: a $600 shortfall. Rates can change together; these scenarios are not predictions or proof of incremental impact.
Reproduce the example with your inputs
In the Paid Media ROI calculator, enter USD, spend 2,400, CPC 2, click-to-lead rate 5%, lead-to-sale rate 20%, average sale 1,000, gross margin 40% and management fees 600.
The model yields 1,200 clicks, 60 leads, 12 sales and $1,800 after media and management. Change one variable at a time. The tool does not fetch live advertising prices, convert currencies or include every operating cost, tax and refund.
Turn the budget into operating controls
Document the maximum test spend, period, included costs and who can approve an increase. Set review points that reflect the sales cycle rather than declaring recent inquiries lost too early.
Check the platform rules for average daily budgets and spending limits before launch. A daily average is not necessarily a hard cap for each day.
- Offer, market, period and fulfillment capacity are documented.
- Margins and conversion assumptions have identifiable sources.
- Setup, production, fees and media are separated.
- Base and downside scenarios use consistent lead definitions.
- The spend limit, owner and review criteria are agreed.
Make the amount explain a decision
A useful budget states the intended outcome, capacity, assumptions and maximum acceptable exposure. If the scenario does not work, narrow the market, improve the offer or prepare the landing page before committing funds.
Our Paid Media service connects campaign planning with the landing page and measurement. Start with the constraints of your business, then decide what investment they support.
REFERENCES
Sources and review
Source documentation consulted on October 1, 2026. Platforms and features may change; check the official source before implementation. The English adaptation retains the source review date of the original article.
- Choosing which conversions to track Google Ads
- Keyword Planner estimates and usage Google Ads
- Daily and monthly spending limits Google Ads
This guide provides general guidance. It does not guarantee search rankings or replace a review of your business, locations and data.