What Growth Rate Hits Your Target?

This is the reverse-engineering tool: instead of projecting forward from current state, you set a destination (target MRR) and a timeline (months), and the calculator computes the monthly growth rate that gets you there. It also tells you how that rate compares to top-quartile SaaS benchmarks, and whether the implied compounding math is realistic given typical funnel constraints.

Required monthly growth = (target MRR / starting MRR)^(1/months) − 1, then × 100 for the percentage. If you're starting at $10K MRR and want to hit $100K in 12 months, the required rate is roughly 21.2% per month, which annualizes to 8.5×. That's top-quartile T2D3 territory ("triple, triple, double, double, double" per Neeraj Agrawal's well-known framework): hard but achievable for product-led SaaS at the right stage.

Per OpenView SaaS Benchmarks: top-quartile MoM growth at sub-$1M ARR is 15-20%, dropping to 8-12% at $1-10M ARR, then 5-8% at $10-50M ARR. The rates compound, so 8% MoM for 12 months is ~2.5× ARR. A growth model that requires 30%+ MoM sustained is almost never realistic for B2B SaaS; consumer apps occasionally hit it during a viral moment, then revert.

You have three options. Extend the timeline: the same target with 24 months instead of 12 cuts the required monthly rate roughly in half (compounding makes this nonlinear, but the direction is right). Lower the target: most fundraising milestones are sized around what's achievable, not what investors want to hear. Change the funnel math: if the required rate needs you to land 200 new customers a month and your pipeline can produce 50, the rate doesn't work regardless of strategy. Use the capacity planner to translate the rate into pipeline + headcount.

Before fundraising (to size the believable trajectory), at the start of every annual planning cycle (to set the OKR baseline), and when investors push back on the growth slide. Pair with the revenue forecaster for the month-by-month projection, and with the growth engine framework to design the systems that produce the rate sustainably.