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Free MoM Growth Calculator

Calculate your month-over-month growth rate, track multi-month trends, detect acceleration or deceleration patterns, and see annualized projections. Works for revenue, subscribers, users, or any metric.

About this tool

Month-over-month growth is the pulse of your business. It's the metric you check every first-of-the-month to know if things are heading in the right direction. Unlike annual reviews, MoM gives you fast feedback — so you can double down on what's working or course-correct before a small dip becomes a big problem.

This calculator gives you more than a percentage. The trend mode tracks multiple months to detect whether your growth is accelerating, decelerating, or volatile. It annualizes your MoM rate so you can see what sustained monthly growth actually means over a year (spoiler: it compounds fast — 5% MoM is 80% annualized).

For email marketing, MoM growth of your subscriber list tells you a lot about your acquisition engine. Are your signup forms converting? Are you losing subscribers faster than you're gaining them? Track list growth alongside unsubscribe rate and net list growth for the complete picture.

For bigger-picture analysis, switch to our year-over-year growth calculator which removes seasonal noise, or use the MRR calculator to track revenue growth specifically.

Frequently Asked Questions

How do you calculate month-over-month growth?

MoM Growth Rate = ((This Month's Value - Last Month's Value) / |Last Month's Value|) × 100. If your revenue was $40,000 last month and $44,000 this month, your MoM growth is ((44,000 - 40,000) / 40,000) × 100 = 10%.

What is a good MoM growth rate?

It depends on your stage. Early-stage startups should aim for 15-25% MoM. Growth-stage SaaS companies typically see 5-15%. Scaled companies at $10M+ ARR usually see 2-5%. Paul Graham's famous benchmark: 5-7% weekly growth for startups, which translates to roughly 20-30% MoM.

How do you annualize MoM growth?

Annualized Growth = ((1 + MoM Rate / 100)^12 - 1) × 100. For 5% MoM: ((1.05)^12 - 1) × 100 = 79.6% annual growth. For 10% MoM: ((1.10)^12 - 1) × 100 = 213.8% annual growth. But be careful — annualized projections assume you sustain that rate, which is hard to do as you scale.

Why does MoM growth naturally slow down?

As your base grows, each percentage point represents more absolute growth. Going from 100 to 110 users is 10% MoM. Going from 10,000 to 11,000 is the same 10% but requires 10x more new users. Market saturation, competition, and diminishing returns on acquisition channels all contribute to slowing MoM rates at scale.

What is the difference between MoM and YoY growth?

MoM compares this month to last month — great for short-term tracking and operational decisions. YoY compares this month to the same month last year — better for strategic decisions because it removes seasonal effects. Use MoM for weekly standup metrics; use YoY for board meetings and investor updates.

How many months of data do I need for meaningful MoM analysis?

At minimum, 3 months to spot a basic trend. Ideally, 6-12 months to identify seasonal patterns and get a reliable average. A single month's growth rate can be misleading — one big customer signup or a seasonal spike can skew everything. Always look at the trend, not individual months.

How do I track MoM growth for email subscriber lists?

Net list growth = (New subscribers - Unsubscribes - Bounces) / Previous month's total × 100. A healthy email list should grow 2-5% MoM after accounting for churn. If your gross signups are high but net growth is flat, focus on reducing unsubscribes and improving subscriber quality.

What causes volatile MoM growth?

Common causes: seasonal business cycles, inconsistent marketing spend, viral spikes followed by drops, dependency on a few large customers, product launches or sales events. If your MoM swings wildly, look at your 3-month rolling average instead for a clearer picture of underlying growth.

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