What Is T2D3? The Triple-Triple-Double-Double-Double SaaS Growth Rule

What Is T2D3?

T2D3 stands for triple, triple, double, double, double. It is a rule of thumb for fast-growing SaaS startups: after reaching roughly $2 million in annual recurring revenue (ARR), grow ARR three times in each of the next two years, then two times in each of the three years after that. The framework was popularized by Neeraj Agrawal of Battery Ventures.

Why do founders keep hearing about it? Because investors use T2D3 as a mental yardstick for what venture-scale growth looks like. It is a benchmark, not a law, and almost no company follows it exactly.

The T2D3 Math, Year by Year

Start at $2 million ARR. Year one triples it to $6 million. Year two triples it again to $18 million. Years three, four and five each double it: $36 million, $72 million and finally $144 million.

Multiply the factors and you get 3 × 3 × 2 × 2 × 2 = 72. In five years ARR grows seventy-two times, which is why the path is attractive to investors and brutally hard to execute.

What T2D3 Means as a Monthly Growth Rate

Tripling in a year sounds abstract until you convert it. Growing 3x in 12 months means compounding at about 9.6 percent per month, because 1.096 multiplied by itself twelve times is roughly 3. Doubling in a year needs about 5.9 percent per month.

That makes the target concrete. A startup at $2 million ARR needs to add roughly $190,000 of new ARR in its first month of year one and keep that percentage going. If your month-over-month growth is 3 percent, you are on track for about 1.4x a year, not 3x.

T2D3 vs. Typical Growth Stages

The rule is most often applied from the point a company has found repeatable sales, usually around Series A. Earlier, ARR is too small and too noisy for a yearly multiple to mean much, because going from $100,000 to $300,000 is a different problem than going from $2 million to $6 million.

Later, the multiples shrink naturally. Doubling $72 million is far harder than doubling $2 million, so many strong companies fall below T2D3 in the later years and still build excellent businesses.

The Cash Behind the Curve

Growth at this speed is paid for before it is earned. Hiring sales reps, buying ads and funding onboarding all hit your bank account immediately, while revenue arrives month by month. The faster you grow, the more cash you consume ahead of the revenue.

That is why T2D3 is as much a runway question as a growth question. If your burn multiple is high, each new dollar of ARR costs a lot of cash, and a three-times year can end with a down round or no round at all. Read growth next to net burn, not alone.

Quality of Growth Matters More Than Speed

Tripling ARR with leaky retention is a treadmill. If customers churn quickly, you spend most of your growth replacing lost revenue. Check net revenue retention, gross margin and CAC payback before celebrating a big multiple.

Also be honest about what you count. Annual contracts, usage spikes and pilots that do not renew can inflate ARR for a quarter. Measure the recurring part and keep one definition from year to year, so the curve means something.

How Founders Should Use T2D3

Use it as a sanity check, not a target to chase at any price. Compare your last twelve months of ARR growth with the 3x and 2x marks and ask what is driving the gap. Sometimes the answer is a weak channel, sometimes a pricing problem, and sometimes the market simply grows slower than software averages.

Then connect it to your plan. If you want to triple, work backwards: how many new customers a month, at what CAC, with how much cash in the bank? A growth goal without a funded plan is only a wish, and investors will test exactly that during due diligence.

Finally, use it to set expectations with your team and board. Saying out loud that you are growing 2x instead of 3x, and why, is far better than letting everyone assume a number nobody has checked.

Three Common Misreadings of T2D3

The first is treating it as a calendar. Real companies have a slow year, a pivot or a pricing reset, and the pattern bends. A company that doubles every year for five years still ends up with 32 times its starting ARR, which is an excellent result.

The second is applying it to the wrong revenue. T2D3 is about recurring revenue. Services, one-off projects and hardware sales do not compound the same way, so the multiples say little about them.

The third is forgetting the base. Tripling from $2 million adds $4 million of ARR, while doubling from $72 million adds $72 million. The later steps look smaller as multiples but are enormous in absolute dollars.

Feel the Trade-Off in Founder Runway

Founder Runway is a 20-turn startup simulation where every decision gives you four options. Push growth aggressively and your cash falls first while revenue follows later, which is exactly the tension behind T2D3.

You can start as a B2B, B2C or B2G company at Pre-Seed, Seed, Pre-Series A or Series A, and see how the same growth appetite plays out from each starting point. Run it twice, once fast and once careful, and compare your final outcomes.