Free Tools
27 free calculators and utilities for DTC media buyers and marketers. No signup, no email gate.
Media buying
Ad Spend Calculator
Project clicks, orders, CPA, and ROAS from a budget before you spend a dollar of it.
Ad Budget Calculator
Work backwards from a revenue goal to the ad budget required to hit it.
ROAS Calculator
Compute return on ad spend from revenue and spend, plus the spend ceiling a target ROAS allows.
Break-Even ROAS Calculator
Find the exact ROAS where your ads stop losing money, from your real unit economics.
MER Calculator
Marketing efficiency ratio: total revenue over total ad spend, the blended truth check.
CPA Calculator
Turn spend and conversions into cost per acquisition, and a target CPA into allowed spend.
CPM Calculator
Solve any side of the CPM equation: spend, impressions, or cost per thousand.
CPC Calculator
Compute cost per click from spend and clicks, or see what a CPM and CTR imply per click.
CTR Calculator
Turn clicks and impressions into click-through rate, with DTC benchmark context.
Conversion Rate Calculator
Compute conversion rate and see what a fraction of a point is worth in orders and revenue.
Ad Frequency Calculator
Impressions over reach: how often people actually see your ad, and when fatigue starts.
Hook Rate Calculator
Measure how many impressions survive the first 3 seconds of your video ad, and how many hold.
ACoS Calculator
Amazon ad cost of sale, TACoS, and the break-even ACoS your margin allows.
Unit economics
AOV Calculator
Compute average order value and model what bundles or thresholds do to it.
Contribution Margin Calculator
What each order really leaves behind after every variable cost, in dollars and percent.
LTV Calculator
Estimate customer lifetime value from order value, purchase frequency, and margin.
CAC Calculator
Customer acquisition cost, paid and blended, and why the two diverge.
LTV:CAC Ratio Calculator
The one ratio that says whether growth spend is building a business or renting revenue.
CAC Payback Calculator
How many months until a new customer pays back their acquisition cost.
Marketing ROI Calculator
Return on marketing investment in profit terms, and how it differs from ROAS.
Discount Break-Even Calculator
How much extra volume a sale needs before the discount pays for itself.
Free Shipping Threshold Calculator
Set the free shipping bar that lifts AOV without quietly eating your margin.
Testing
A/B Test Significance Calculator
Check whether your test winner is real or noise, with p-value and confidence.
A/B Test Sample Size Calculator
How many visitors each variant needs before your test can detect a real lift.
Creative Testing Budget Calculator
Size the budget a creative test actually needs to reach a readable result per concept.
Utilities
The tools tell you the target. StefanBrain hits it.
Copy, creative, CRO, video, and Meta publishing run as one connected system — trained on 7+ years of proprietary DTC marketing IP.