SAAS REVENUE
MRR (Monthly Recurring Revenue)
Normalized monthly revenue from active subscriptions. Movements usually break into new, expansion, contraction, and churned MRR so net change is visible.
FORMULA
MRR ≈ Σ (active accounts × monthly subscription price)EXAMPLE
100 accounts at $50/mo + 20 at $120/mo → MRR = $5,000 + $2,400 = $7,400. A $10k one-time setup fee is not MRR.
WHY IT MATTERS
MRR is the recurring floor the rest of the SaaS model stands on. ARR, growth rate, and many payback sketches derive from it.
COMMON MISTAKES
- Mixing one-time revenue into MRR
- Ignoring downgrades (contraction) when reading “growth”
- Annualizing prepaid deals inconsistently quarter to quarter
SAAS REVENUE
ARR (Annual Recurring Revenue)
Annualized view of recurring revenue. For pure monthly subscriptions, ARR is often MRR × 12. Multi-year and prepaid deals need a clear normalization rule.
FORMULA
ARR ≈ MRR × 12 (when the book is monthly)EXAMPLE
MRR $40,000 → ARR ≈ $480,000 before annual discounts or multi-year contract quirks.
WHY IT MATTERS
Boards and investors often benchmark ARR. Use one definition consistently so growth is comparable period to period.
COMMON MISTAKES
- Switching between “booked ARR” and “run-rate ARR” without labeling which
- Folding non-recurring services into ARR
SAAS REVENUE
ARPU (Average Revenue Per User)
Mean recurring revenue per account or user in a period. Often MRR divided by active customers. Some teams track ARPA (per account) separately from seats.
FORMULA
ARPU ≈ MRR ÷ active customersEXAMPLE
MRR $75,000 ÷ 1,500 customers → ARPU $50 per month.
WHY IT MATTERS
ARPU moves with packaging, seat expansion, and mix. Track it beside logo count so “growth” is not only more logos at lower price.
COMMON MISTAKES
- Blending free users into the denominator without saying so
- Comparing ARPU across products with different seat definitions
UNIT ECONOMICS
CAC (Customer Acquisition Cost)
Average sales and marketing spend to win one new paying customer in a period. Fully loaded CAC includes salaries, agencies, tools, and ads attributed to acquisition.
FORMULA
CAC = (S&M spend in period) ÷ (new paying customers)EXAMPLE
Spend $50,000 on S&M, add 25 paying customers → CAC = $2,000.
WHY IT MATTERS
CAC only means something next to lifetime value and payback. Cheap traffic that never converts is not cheap CAC.
COMMON MISTAKES
- Excluding salaries or agency fees from S&M
- Dividing by leads or trials instead of paying customers
- Mixing organic and paid cohorts without a clear rule
UNIT ECONOMICS
CAC payback period
Months of contribution (or gross profit) needed to recover CAC. Shorter payback eases cash pressure when you scale spend.
FORMULA
Payback months ≈ CAC ÷ (monthly contribution per customer)EXAMPLE
CAC $2,400, contribution $200/mo → payback ≈ 12 months. If contribution is only $100/mo, payback doubles.
WHY IT MATTERS
You can “afford” a high CAC if payback fits your cash runway. Scaling ads before you know payback is how SaaS burns.
COMMON MISTAKES
- Using revenue instead of contribution in the denominator
- Ignoring that early months often have lower expansion and higher support cost
UNIT ECONOMICS
CLV / LTV (Customer Lifetime Value)
Expected revenue or gross profit from a customer over the relationship. Simple models use ARPU × lifespan × margin. Discounted models pull future cash back to today.
EXAMPLE
ARPU $80/mo, gross margin 80%, average life 24 months → revenue LTV ≈ $1,920; gross-profit LTV ≈ $1,536.
WHY IT MATTERS
Healthy SaaS often targets LTV:CAC around 3:1 or better with payback that cash can survive. LTV is a planning sketch, not a guarantee.
COMMON MISTAKES
- Using infinite lifespan when churn is material
- Comparing revenue LTV to CAC without margin
- Ignoring cohort quality differences (SMB vs enterprise)
UNIT ECONOMICS
Unit economics
Per-customer or per-order profitability: CAC, payback, LTV, contribution, and often LTV:CAC on one sheet. The “unit” is usually a paying account.
EXAMPLE
CAC $1,500, gross-profit LTV $4,800 → LTV:CAC = 3.2. Payback 11 months. That unit can scale more safely than CAC $1,500 with LTV $2,000.
WHY IT MATTERS
Scaling bad unit economics just burns cash faster. Fix the unit before pouring budget into ads.
COMMON MISTAKES
- Averaging across products with very different margins
- Celebrating LTV:CAC while payback exceeds runway
RETENTION
Monthly churn rate
Share of customers (logo churn) or recurring revenue (revenue churn) lost in a month. It is a short-cycle leak metric, not the same as annualized churn without conversion.
FORMULA
Logo churn ≈ customers lost ÷ customers at start of monthEXAMPLE
Start 1,000 customers, lose 25 → monthly logo churn 2.5%. That is not “30% annual” unless you convert correctly.
WHY IT MATTERS
Small monthly churn compounds. A 2% monthly logo leak is a serious annual retention problem.
COMMON MISTAKES
- Multiplying monthly % by 12 instead of compounding or using the right annual formula
- Mixing logo and revenue churn in one headline number
RETENTION
Annual churn rate
Customer or revenue loss measured on a year window. Can be computed from annual cohorts or converted from monthly rates with an explicit method (compound vs naive ×12).
EXAMPLE
1% monthly logo churn compounds to about 11.4% annual loss of the starting base if the rate holds. Naive 1% × 12 = 12% is only a rough cue.
WHY IT MATTERS
Boards often want annual retention language. Mis-converting monthly rates makes the book look healthier or worse than it is.
COMMON MISTAKES
- Reporting ×12 annualization as if it were compound survival
- Changing cohort definitions mid-year
Revenue or logo loss before giving credit for expansion. Gross revenue churn answers: how much recurring revenue left the starting cohort to cancellation or downgrade.
EXAMPLE
Start-month cohort MRR $100k. Cancellations and downgrades remove $8k. Gross revenue churn = 8% for that month, even if expansion elsewhere is strong.
WHY IT MATTERS
Gross churn shows the leak. Net metrics can hide a large hole if expansion is carrying the book.
COMMON MISTAKES
- Calling net churn “churn” in a board pack without showing gross
- Excluding downgrades from gross revenue churn
Revenue churn after expansion credit. Net churn can be negative when expansion and upgrades exceed losses from the starting cohort.
FORMULA
Net churn ≈ (churned + contracted − expanded) ÷ starting MRREXAMPLE
Start $100k MRR, lose $8k, expand $5k → net revenue churn 3%. If expansion is $12k, net churn is −4% (net expansion).
WHY IT MATTERS
Net churn links retention to land-and-expand quality. Negative net churn is a growth engine inside the existing base.
COMMON MISTAKES
- Reporting net churn alone when gross leak is severe
- Crediting new-logo MRR as “expansion” inside a cohort NRR/net-churn calc
RETENTION
Revenue churn ($)
Dollar amount of recurring revenue lost to cancellations and often contractions in a period. Complements rate-based churn with absolute cash impact.
EXAMPLE
Cancel $6,000 MRR and downgrade another $2,000 → $8,000 revenue churn that month before expansion.
WHY IT MATTERS
A “small” percentage on a large book is still a large dollar hole. Dollar churn pairs with replacement-stack planning.
COMMON MISTAKES
- Looking only at logo counts when enterprise accounts dominate dollars
RETENTION
Customer retention rate
Share of customers who remain active between two dates. Roughly the complement of logo churn when definitions match.
FORMULA
Retention ≈ customers remaining ÷ customers at startEXAMPLE
Start 1,000 customers, 920 remain → retention 92% (logo churn 8%).
WHY IT MATTERS
Retention drives lifetime value more than acquisition tweaks once the product is mature.
COMMON MISTAKES
- Counting reactivations as “retained” without a cohort rule
- Comparing retention windows of different lengths
RETENTION
NRR (Net Revenue Retention)
Revenue kept from an existing cohort including expansion, divided by starting cohort revenue. Values above 100% mean the cohort grew without new logos.
FORMULA
NRR = (Starting cohort MRR + expansion − contraction − churn) ÷ Starting cohort MRREXAMPLE
Cohort starts $200k MRR and ends $230k without new logos → NRR = 115%.
WHY IT MATTERS
Elite SaaS can grow ARR even with flat new sales when NRR stays above 100%. It is a quality check on the installed base.
COMMON MISTAKES
- Mixing new logos into the ending cohort revenue
- Changing the cohort start definition between quarters
RETENTION
NDR (Net Dollar Retention)
Dollar-retention twin of NRR: ending cohort recurring dollars divided by starting cohort dollars, including expansion and losses. Naming varies by company; the math is the same family as NRR.
EXAMPLE
Start cohort $500k, end $540k after expansion and churn → NDR = 108%.
WHY IT MATTERS
Board packs often say NDR or NRR interchangeably. Know which label your team uses and keep the formula fixed.
COMMON MISTAKES
- Treating NDR and logo retention as the same metric
RETENTION
GRR (Gross Revenue Retention)
Revenue retained from a cohort before expansion credit. GRR cannot exceed 100%. It isolates how much of the starting book you keep after churn and contraction.
FORMULA
GRR ≈ (Starting MRR − churned − contracted) ÷ Starting MRREXAMPLE
Start $200k, lose $20k to cancel/downgrade, ignore expansion → GRR = 90%. NRR can still be 110% if expansion is $40k.
WHY IT MATTERS
NRR without GRR can hide a leaky base. Expansion should not be the only story.
COMMON MISTAKES
- Reporting NRR as if it were GRR
- Allowing GRR above 100% by sneaking expansion into the formula
PROFITABILITY
Gross margin
Revenue minus direct cost of delivering the product (COGS), as a percent of revenue. In SaaS, COGS often includes hosting, support tiers, and third-party delivery costs.
FORMULA
Gross margin % = (Revenue - COGS) ÷ Revenue × 100EXAMPLE
Revenue $200k, COGS $60k → gross profit $140k → gross margin 70%.
WHY IT MATTERS
High gross margin funds S&M and R&D. Soft margins make CAC payback harder even when logos look fine.
COMMON MISTAKES
- Parking customer success entirely in OpEx when it is truly delivery COGS
- Comparing gross margin across companies with different COGS policies
PROFITABILITY
Markup vs margin
Markup is profit as a percent of cost. Margin is profit as a percent of selling price. The same dollars produce different percentages.
FORMULA
Markup % = profit ÷ cost; Margin % = profit ÷ priceEXAMPLE
Cost $60, price $100 → profit $40. Markup = 66.7%. Margin = 40%. Mixing the words mis-sets price targets.
WHY IT MATTERS
Pricing conversations fail when one person says “50% markup” and another hears “50% margin.”
COMMON MISTAKES
- Using markup % as if it were margin % in a price target
PROFITABILITY
Contribution margin
Revenue minus variable costs (per unit or per customer). Shows what each sale contributes toward fixed costs and profit.
FORMULA
Contribution = Price - variable cost (per unit)EXAMPLE
Price $100, variable cost $35 → contribution $65 (65% contribution margin).
WHY IT MATTERS
Channel and pricing decisions should clear contribution, not just top-line revenue. Payback math usually needs contribution, not revenue.
COMMON MISTAKES
- Treating fixed overhead as variable cost in contribution
- Using gross margin and contribution margin interchangeably
PROFITABILITY
Break-even point
Sales volume (units or revenue) where total contribution covers fixed costs. Operating profit is zero at that point before financing effects.
FORMULA
Break-even units ≈ Fixed costs ÷ contribution per unitEXAMPLE
Fixed costs $50,000/mo, contribution $25/unit → break-even ≈ 2,000 units that month.
WHY IT MATTERS
Tells you the minimum book or volume before the business funds itself. Useful for pricing and hiring plans.
COMMON MISTAKES
- Forgetting that fixed costs step up when you hire or expand infra
- Using gross margin dollars when contribution is the right cover metric
Earnings before interest, taxes, depreciation, and amortization. A common proxy for operating profit before capital structure and non-cash D&A.
EXAMPLE
Operating income $120k + D&A $30k → EBITDA $150k (simplified add-back sketch).
WHY IT MATTERS
Used in valuations and lending conversations. It is not cash in the bank when working capital or capex is heavy.
COMMON MISTAKES
- Treating EBITDA as free cash flow
- Comparing EBITDA across companies with very different capitalization policies
PROFITABILITY
EBITDA margin
EBITDA as a percent of revenue. Shows operating profitability intensity after the D&A add-back framing.
FORMULA
EBITDA margin % = EBITDA ÷ Revenue × 100EXAMPLE
EBITDA $150k on $1M revenue → EBITDA margin 15%.
WHY IT MATTERS
Peer bands and board packs often watch margin trajectory, not only absolute EBITDA dollars.
COMMON MISTAKES
- Comparing EBITDA margin to gross margin as if they measure the same layer
How list price, packaging, and discounts map to a value metric (per seat, usage, outcome, or flat). Strategy includes corridor, discounting rules, and packaging ladders.
EXAMPLE
Moving from flat $99 to $12/seat with a 5-seat minimum can raise ARPU if teams expand seats faster than churn rises.
WHY IT MATTERS
Small price lifts flow to margin when retention holds. Bad packaging taxes sales capacity and confuses buyers.
COMMON MISTAKES
- Discounting without measuring payback impact
- Changing value metrics every quarter so cohorts become incomparable
CASH & STRUCTURE
Cash flow projection
Forecast of cash in versus cash out over months. Timing of collections, payroll, tax, and prepaid deals matters as much as accounting profit.
EXAMPLE
Booked MRR up 10% while collections lag 45 days can still create a cash dip if payroll is due now.
WHY IT MATTERS
Profitable SaaS can still fail if burn is front-loaded and collections lag. Projection is a survival tool.
COMMON MISTAKES
- Equating revenue recognition with cash received
- Ignoring tax and annual prepaid seasonality
CASH & STRUCTURE
Holding company (HoldCo)
A parent entity that owns operating companies (OpCos). Used for liability separation, multi-brand control, or investment holding. Admin cost and complexity are real.
EXAMPLE
HoldCo owns three OpCos. Shared admin is $8k/mo. Benefit only shows if risk separation or financing access exceeds that burden.
WHY IT MATTERS
Structure is not free. Model admin cost and setup payback before creating entities for aesthetics.
COMMON MISTAKES
- Assuming HoldCo automatically reduces tax without counsel
- Ignoring transfer-pricing and intercompany paperwork cost