Comparison
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MoM Growth vs YoY Growth (Month-over-Month vs Year-over-Year)
Quick Answer
MoM growth measures the percentage change from one month to the next, revealing short-term momentum, while YoY growth compares the same month across years, eliminating seasonality and showing sustained trajectory.
What is MoM Growth?
Month-over-Month (MoM) growth measures the percentage change in a metric from one month to the next. If MRR was $100K in January and $110K in February, MoM growth is 10%. MoM growth is the heartbeat metric for early-stage startups — it shows immediate momentum and is how YC and other accelerators evaluate company progress. Consistent MoM growth of 10-15% is exceptional at seed stage and compounds dramatically over a year.
What is YoY Growth?
Year-over-Year (YoY) growth compares the same month (or quarter) to the same period in the prior year. If March 2025 revenue was $500K and March 2024 revenue was $250K, YoY growth is 100%. YoY growth eliminates seasonal fluctuations and shows the true trajectory of a business. It's the standard growth metric for Series B+ companies, public earnings reports, and mature business analysis. VCs use YoY growth to assess whether a company is on a venture-scale trajectory.
Key Differences
| Feature | MoM Growth | YoY Growth |
|---|---|---|
| Time Comparison | This month vs last month — immediate trajectory | This month vs same month last year — long-term trajectory |
| Seasonality | Affected by seasonality — December dips can look like decline | Eliminates seasonality — compares equivalent periods |
| Volatility | High — small absolute changes create large percentage swings | Stable — smooths out monthly fluctuations |
| Best for Stage | Early stage — seed through Series A when you need weekly/monthly momentum signals | Growth stage — Series B+ when you have 12+ months of data |
| VC Expectations | 10-15% MoM is exceptional at seed, 5-10% is good, <5% is slow | 100%+ YoY is strong for Series B, 50-80% for Series C, 30-50% for Series D+ |
| Compounding Effect | 10% MoM = 214% YoY growth (3.1× in one year) | 100% YoY = ~6% MoM average (helps calibrate expectations) |
| Manipulation Risk | Easy to cherry-pick a good month or exclude a bad one | Harder to manipulate — 12-month comparison is more robust |
When Founders Choose MoM Growth
- →Use MoM growth for early-stage companies (pre-Series B) when you need immediate feedback on growth experiments, product changes, or marketing campaigns. MoM is how you stay accountable week-to-week and month-to-month during the critical early scaling phase.
When Founders Choose YoY Growth
- →Use YoY growth for mature companies, board presentations, investor updates, and any context where seasonal comparison matters. YoY is the standard growth metric for Series B+ companies and is what public market analysts use.
Example Scenario
A SaaS company in December: MRR drops from $200K (November) to $185K (December) due to holiday slowdowns. MoM growth: -7.5% (looks terrible). But December last year was $95K. YoY growth: +94.7% (looks great). Both numbers are true. MoM shows a seasonal dip. YoY shows the company nearly doubled in 12 months. The experienced investor looks at YoY and sees a healthy, fast-growing business with normal seasonality.
Common Mistakes
- 1Using MoM growth for businesses with strong seasonality (e-commerce in December, tax software in April). Presenting YoY growth for a 6-month-old company (you don't have valid comparisons yet). Not annualizing MoM growth to help investors understand the trajectory (10% MoM = ~3× per year). Cherry-picking growth periods — always present trailing 3-month or 6-month MoM averages rather than single-month peaks.
Which Matters More for Early-Stage Startups?
Both matter at different stages. MoM growth matters more for early-stage companies because it provides the immediate feedback loop needed to iterate quickly. YoY growth matters more for growth-stage companies because it shows sustainable trajectory and eliminates noise. The key insight: high MoM growth that can't sustain for 12+ months isn't real growth — it's a spike. Consistent MoM growth that compounds into strong YoY growth is what builds venture-scale companies.
Related Terms
Frequently Asked Questions
What is MoM Growth?
Month-over-Month (MoM) growth measures the percentage change in a metric from one month to the next. If MRR was $100K in January and $110K in February, MoM growth is 10%. MoM growth is the heartbeat metric for early-stage startups — it shows immediate momentum and is how YC and other accelerators evaluate company progress. Consistent MoM growth of 10-15% is exceptional at seed stage and compounds dramatically over a year.
What is YoY Growth?
Year-over-Year (YoY) growth compares the same month (or quarter) to the same period in the prior year. If March 2025 revenue was $500K and March 2024 revenue was $250K, YoY growth is 100%. YoY growth eliminates seasonal fluctuations and shows the true trajectory of a business. It's the standard growth metric for Series B+ companies, public earnings reports, and mature business analysis. VCs use YoY growth to assess whether a company is on a venture-scale trajectory.
Which matters more: MoM Growth or YoY Growth?
Both matter at different stages. MoM growth matters more for early-stage companies because it provides the immediate feedback loop needed to iterate quickly. YoY growth matters more for growth-stage companies because it shows sustainable trajectory and eliminates noise. The key insight: high MoM growth that can't sustain for 12+ months isn't real growth — it's a spike. Consistent MoM growth that compounds into strong YoY growth is what builds venture-scale companies.
When would you encounter MoM Growth vs YoY Growth?
A SaaS company in December: MRR drops from $200K (November) to $185K (December) due to holiday slowdowns. MoM growth: -7.5% (looks terrible). But December last year was $95K. YoY growth: +94.7% (looks great). Both numbers are true. MoM shows a seasonal dip. YoY shows the company nearly doubled in 12 months. The experienced investor looks at YoY and sees a healthy, fast-growing business with normal seasonality.
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