How your best analyst defines it

Run rate vs trailing twelve months

Run rate annualizes a recent period, usually a month times twelve or a quarter times four. Trailing twelve months (TTM) adds up the last twelve actual months. For a seasonal consumer brand, run rate is almost always wrong, because no single month or quarter is a typical one. TTM shows where the business really is. To project the year, divide year-to-date by the share of the year those months usually make up.

By Jim Wilson · Updated October 14, 2026

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A worked example

An apparel brand did $21.8M over the last twelve months, up 17% on the year before. It is now the end of March. Sample figures:

  • Q1 net revenue: $4.1M.
  • Run rate (Q1 x 4): $16.4M. That suggests the business shrank 25%. It did not.
  • Q1 share of the year, last three years: 18%, 19%, 20%, so call it 19%.
  • Projection ($4.1M / 19%): about $21.6M, in line with the trailing twelve months and the plan.

The run-rate figure would lead a board to cut spend in the months that matter most. The seasonal projection says the year is on track.

Same question, two answers

"What's our run rate?" Illustrative example
Out-of-the-box AI

Q1 net revenue was $4.1M, which puts you on pace for $16.4M this year.

Multiplied a quarter by four. For a seasonal brand, Q1 is never the run rate.

Trained on your business

Trailing twelve months is $21.8M, up 17%. Q1 is typically 19% of your year, so it points to about $22M, in line with plan. Margin is the watch item: product cost from the landed-cost file is up 90 basis points, which platform cost fields don't show.

TTM first, your own seasonality curve, and cost from the file you actually trust.

Why this matters for AI

Ask a general-purpose AI for your run rate and it will multiply. It has no way to know your business is seasonal, which months carry the year, or that your team always leads with TTM. Those are exactly the judgment calls a model has to be taught before its answers are worth acting on.

That teaching is the first part of every operations audit, and it is what makes the weekly recap and the close pack read like your best analyst wrote them.

Contribution margin for consumer brandsWhat contribution margin means for a DTC or omnichannel consumer brand, which costs belong in it, and why every brand has to write down its own version.How to calculate return rateHow to calculate return rate for an apparel or DTC brand: units or dollars, whether exchanges count, which month to measure, and which system to trust.Landed cost vs the store platform's cost fieldWhat landed cost includes for a consumer brand, why the cost field in Shopify or another store platform often understates it, and how to keep margins honest.

Questions

When is run rate fine to use?

When a business is not seasonal and growing steadily, or for a quick read on a cost line that is flat month to month, like rent or software. For revenue at a consumer brand, rarely.

How do I calculate trailing twelve months?

Add up the most recent twelve complete months. Each month, drop the oldest one and add the newest. Compare it to the same figure a year ago to get growth that is free of seasonality.

How do I project the full year?

Take year-to-date actuals and divide by the share of the full year those same months have made up historically. If January to March is usually 19% of the year, $4.1M in Q1 points to about $21.6M, not $16.4M.

What if the seasonality is changing?

Use the last two or three years and watch the trend. A brand adding wholesale or a new holiday product will see its curve shift, and the projection should say so rather than hide it.

Thirty minutes. Bring one question your team answers every week.

I'll show you how generic AI answers it, how your best analyst would, and what it takes to close the gap.

jim@trimtabops.com