📚 SaaS calculators
The SaaS calculators cluster covers subscription performance math: monthly and logo churn, NRR, GRR, LTV:CAC, CAC payback, magic number, Rule of 40, ARPU, expansion %, quick ratio, burn multiple, pipeline coverage, seat utilization, ARR/MRR growth, activation rate, and time-to-value—each on a single-intent URL. Finance loan-to-value, HR retention, and software code churn live on their own hubs.
Run SaaS and subscription performance math in one place: monthly and logo churn, net and gross revenue retention, expansion revenue %, ARPU, LTV:CAC and CAC payback, sales efficiency via magic number, Rule of 40, quick ratio, and burn multiple, plus ARR/MRR growth, pipeline coverage, seat utilization, activation rate, and time-to-value. Keep billing cohort and MRR definitions identical to the calculator labels. Finance loan-to-value, HR retention, and code churn live on their hubs—do not swap those denominators into SaaS board packs.
Key facts
| Primary audience | SaaS founders, finance partners, CS leaders, and growth operators |
|---|---|
| Core formulas | Churn, NRR, GRR, LTV:CAC, quick ratio, burn multiple, ARR/MRR growth, activation, TTV |
| Category | SaaS / subscriptions / recurring revenue |
| Related hubs | Finance (loan-to-value); HR (retention); Software Development (code churn); DevOps |
Definitions
NRR
(Start MRR + expansion − contraction − churned) ÷ start MRR × 100—can exceed 100% with expansion.
Quick ratio
(New + expansion MRR) ÷ (churned + contraction MRR). Distinct from accounting acid-test quick ratio.
Burn multiple
Net burn ÷ net new ARR—capital efficiency for growth SaaS.
Rule of 40
Revenue growth % + profit margin %. Distinct from finance Rule of 72.
Formulas
- Monthly churn %: Customers lost ÷ Starting customers × 100
- Logo churn %: Logos lost ÷ Starting logos × 100
- NRR %: (Start + Expansion − Contraction − Churned) ÷ Start × 100
- GRR %: (Start − Contraction − Churned) ÷ Start × 100
- LTV:CAC: Customer LTV ÷ CAC
- CAC payback months: CAC ÷ (ARPU × Gross margin fraction)
- Magic number: (Net new ARR × 4) ÷ Prior S&M spend
- Rule of 40: Revenue growth % + Profit margin %
- ARPU: MRR ÷ Customers
- Expansion %: Expansion MRR ÷ Start MRR × 100
- Quick ratio: (New + Expansion MRR) ÷ (Churned + Contraction MRR)
- Burn multiple: Net burn ÷ Net new ARR
- Pipeline coverage: Pipeline ÷ Quota
- Seat utilization %: Active seats ÷ Paid seats × 100
- ARR growth %: (End − Start) ÷ Start × 100
- MRR growth %: (End − Start) ÷ Start × 100
- Activation rate %: Activated users ÷ Signups × 100
- Time to value (days): Total days to value ÷ Activated users
Comparison table
| Topic | Guidance |
|---|---|
| Monthly churn vs logo churn | Same ratio shape; logo churn is account-level while monthly churn may use seats/users—label the unit. |
| NRR vs GRR | NRR includes expansion and can exceed 100%; GRR excludes expansion. |
| Expansion % vs NRR | Expansion % is expansion÷start only; NRR nets expansion with contraction and churn. |
| Quick ratio vs NRR | Quick ratio is growth÷lost MRR speed; NRR is ending retained book vs start including expansion. |
| Burn multiple vs magic number | Burn multiple is net burn÷net new ARR; magic number is annualized net new ARR÷prior S&M. |
| LTV:CAC vs Finance loan-to-value | SaaS LTV:CAC is customer lifetime value ÷ CAC; Finance LTV is loan ÷ property value. |
| LTV:CAC vs CAC payback | LTV:CAC is a ratio; payback is months of contribution margin to recover CAC. |
| Magic number vs Rule of 40 | Magic number is sales efficiency (ARR vs S&M); Rule of 40 is growth % + profit margin %. |
| ARR growth vs MRR growth | Same % formula; ARR is annualized recurring revenue, MRR is monthly—do not mix periods. |
| Activation rate vs time-to-value | Activation is % who reach value; TTV is average days among activated users. |
| Rule of 40 vs Rule of 72 | Rule of 40 is SaaS growth+margin; Rule of 72 estimates doubling time on the Finance/Advanced hubs. |
| ARPU vs retail ATV | ARPU is MRR÷customers; ATV is retail sales÷transactions. |
| SaaS churn vs code churn | SaaS churn is customers/logos lost; code churn is lines rewritten on Software Development. |
| SaaS retention vs HR retention | SaaS NRR/GRR are revenue retention; HR retention is people ops. |
Glossary references
Reinforce entities by pairing percent language with conversion pages when learners mix fractions, decimals, and ratios.
❓ Frequently Asked Questions
Is SaaS LTV the same as Finance loan-to-value?
No. Finance LTV is loan ÷ property value. SaaS LTV:CAC is customer lifetime value ÷ CAC.
How do NRR and GRR differ?
NRR includes expansion and can exceed 100%. GRR excludes expansion and is typically ≤ 100%.
Is SaaS quick ratio the same as accounting quick ratio?
No. Accounting quick ratio is liquid assets ÷ current liabilities. SaaS quick ratio is growth MRR ÷ lost MRR.
Is monthly churn the same as code churn?
No. Code churn is on the Software Development hub. This hub’s churn tools are SaaS customers or logos lost.
Is SaaS retention the same as HR retention?
No. HR retention is people ops. SaaS NRR/GRR measure recurring revenue retention.
What is the Rule of 40?
Revenue growth % + profit margin %. Distinct from the Finance Rule of 72.
Do these replace billing or board reporting standards?
No. They compute educational formulas from your inputs—billing system and board definitions remain authoritative.