SaaS Metrics Tracker

Why a single MRR number lies to you

MRR alone is the most misunderstood metric in SaaS. Two companies at $500K MRR can have wildly different trajectories depending on the motion underneath. Company A: $60K new, $8K expansion, $3K contraction, 2.1% monthly churn ($10.5K churn MRR). Company B: $35K new, $2K expansion, $1K contraction, 5.5% monthly churn ($27.5K churn MRR). Both end the month at the same MRR if starting mix is different. Project them forward 12 months at current motion — Company A lands at $720K MRR, Company B lands at $510K MRR. Same headline, very different business. The tracker above pulls those four movements apart so you see the actual motion, not just the headline.

The eight metrics a Series-A lead reads first

A Series-A diligence conversation lives on these numbers. The tracker returns all of them live:

1. MRR (and implied ARR). The stake-in-the-ground. Everything else is a ratio.
2. Net new MRR per month. New + expansion − contraction − churn. If this is negative, you're shrinking regardless of how the dashboard looks.
3. Net revenue retention (NRR). The single most diagnostic number — expansion can mask churn only up to a point. 110%+ is elite; 100% is healthy; below 90% is leaky.
4. LTV:CAC. Is acquisition worth it? 3:1 is target; 5:1 is elite; below 1:1 is unsustainable.
5. CAC payback period. Months of gross profit to recover blended CAC. Sub-12 is elite; 12–18 is healthy; 24+ is a cash treadmill.
6. Monthly gross churn. < 2%/mo for SMB SaaS is elite; 3–5% is healthy; > 7% indicates product-market fit or onboarding problems.
7. Rule of 40. Annual growth + profit margin ≥ 40. The benchmark for mature SaaS health.
8. Approximate customer count. MRR ÷ ARPU. A sanity check on whether your ARPU input is realistic.

A worked example: a B2B SaaS at $40K MRR

B2B SaaS, 450 customers at $89 ARPU, growing 12% MoM. Plug the numbers in: starting MRR $40K, new MRR $6K, expansion $1.4K, contraction $600, monthly churn 3.2%. That's $1.28K in churned MRR. Net new MRR = $6K + $1.4K − $600 − $1.28K = $5.52K monthly growth. Monthly growth rate 13.8%. NRR = (40K + 1.4K − 600 − 1.28K) / 40K = 98.8%. Slightly leaky but close to 100%.

With $640 blended CAC and 78% gross margin, LTV:CAC runs about 3.4:1. CAC payback is 9.2 months — elite territory. Rule of 40 clocks around 190 (12% MoM compounds to ~290% annualized, plus rough margin contribution) — strong growth-stage number. If this team can drop churn from 3.2% to 2.1% without hurting acquisition, 12-month MRR moves from ~$175K to ~$205K. That's the scale of leverage churn has — almost nothing else moves the trajectory this much.

NRR is the metric that matters most above $1M ARR

Below $1M ARR, new-logo growth drives everything because you have so few customers to expand. Above $1M ARR, expansion from the existing base becomes the largest growth engine. A SaaS company at 120% NRR doubles revenue every 4 years with zero new customers. A SaaS company at 85% NRR needs to acquire 18–22% in new MRR every year just to stay flat. Investors know this: they'll trade 20 points of top-line growth for 10 points of NRR every time, because NRR growth is essentially free compared to new-logo growth.

Three levers move NRR up: reduce gross churn (fix onboarding, reduce time-to-value), increase expansion (seat-based pricing, usage-based pricing, add-on modules), reduce contraction (annual contracts, better tier structure). Most teams over-invest in the first lever and under-invest in the second. Expansion revenue has a near-zero CAC — the customer is already acquired. Prioritize product decisions that unlock expansion before you hire another SDR.

CAC payback: the truth about cash efficiency

LTV:CAC tells you if a customer is worth acquiring. CAC payback tells you when you'll have the cash back. Both matter, but below $5M ARR, payback matters more because you're financing the gap from your own balance sheet. A company with 3:1 LTV:CAC but 24-month payback will run out of cash before the LTV arrives — the LTV is real but the cash isn't liquid for two years. A company with 2.5:1 LTV:CAC and 9-month payback is a much better cash business even though the LTV multiple looks worse.

Rule of thumb for early-stage: payback should be less than the length of your cash runway divided by two. If you have 18 months of runway, payback shorter than 9 months means you can keep acquiring without running out. Anything longer and you're accelerating the cash burn.

Rule of 40 and the growth-vs-profitability tradeoff

Rule of 40 lets the market accept growth-stage unprofitability when growth rate is high. Snowflake at IPO: 100%+ growth, -30% margin, Rule of 40 score 70+ — passes easily. Zoom post-IPO: 30% growth, 20% margin — score 50, passes. Slack pre-Salesforce acquisition: 50% growth, 0% margin — score 50, passes. Failing Rule of 40 with mediocre growth and bad margin (20% growth, -10% margin, score 10) is what kills mid-stage companies: investors won't fund the next round on those numbers.

The tracker approximates margin using gross margin × 0.15 as a rough heuristic for EBITDA margin. For an exact Rule of 40, substitute your real EBITDA margin. Below $1M ARR, Rule of 40 isn't really diagnostic — growth is the only axis that matters. Above $5M ARR it becomes the single most-cited number in Series-B pitches.

What to excl in MRR (and what to put on a separate line)

MRR is pure recurring revenue. Exclude one-time setup fees, professional services, non-recurring add-ons, and the lump-sum of annual prepays (spread these across 12 months). Non-recurring revenue belongs on a separate "services revenue" line — it funds cash flow but it doesn't compound. Mixing services revenue into MRR is the single most common accounting mistake early-stage founders make, and it inflates growth rates by 15–30% in ways that break down in diligence. Keep the lines separate.

Pair this with the rest of the SaaS operating stack

The tracker is the summary view. For churn-specific analysis use the churn calculator. For unit-economics depth use the CLV calculator. For cash-flow timing of bookings vs cash use the monthly cash flow projector. For whether you're efficient per head vs peers use the competitor comparison tool. The tracker identifies the weak metric; the other tools show you the underlying drivers.