MRR & ARR Calculator
Free MRR and ARR calculator. Break down monthly recurring revenue into new, expansion, contraction, and churned components. Track SaaS revenue health with net MRR movement.
Churn Rate Impact Calculator
Free churn rate impact calculator. Visualize the compounding revenue loss from churn, model retention curves, and see the dollar impact of reducing churn by just 1%.
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MRR Saved by Reducing Churn (Month 24)
+$18,943.00/mo
$18,943.00 total revenue saved over 24 months
Current (5% monthly)
Annual churn: 46%
Monthly loss: $5,000.00
Annual loss: $60,000.00
Half-life: 13.5 months
After 24mo: 29.2% retained
MRR at month 24: $29,199.00
Target (3% monthly)
Annual churn: 30.6%
Monthly loss: $3,000.00
Annual loss: $36,000.00
Half-life: 22.8 months
After 24mo: 48.1% retained
MRR at month 24: $48,142.00
Retention Curves
Month 0Month 24
■ Current (5%)■ Target (3%)
Monthly MRR Comparison
| Month | Current MRR | Target MRR | Difference | Current Retained | Target Retained |
|---|---|---|---|---|---|
| 0 | $100,000.00 | $100,000.00 | $0.00 | 100% | 100% |
| 1 | $95,000.00 | $97,000.00 | +$2,000.00 | 95% | 97% |
| 3 | $85,737.00 | $91,267.00 | +$5,530.00 | 85.7% | 91.3% |
| 6 | $73,509.00 | $83,297.00 | +$9,788.00 | 73.5% | 83.3% |
| 12 | $54,036.00 | $69,384.00 | +$15,348.00 | 54% | 69.4% |
| 18 | $39,721.00 | $57,795.00 | +$18,074.00 | 39.7% | 57.8% |
| 24 | $29,199.00 | $48,142.00 | +$18,943.00 | 29.2% | 48.1% |
This models existing cohort retention. Real MRR also includes new customer additions and expansion revenue.
Planning notes, formulas, and examples
About the Churn Rate Impact Calculator
Churn compounds relentlessly. A seemingly small 5% monthly churn means losing 46% of customers after just one year. Reduce that to 3% and you retain 69% instead — a 50% improvement in retention from a 2-point churn reduction.
The revenue impact is even more dramatic. For a $100K MRR business with 5% monthly churn, you lose $600K in annual revenue just to churn. Drop churn to 3%, and the annual loss shrinks to $360K — saving $240K per year with no additional sales effort.
This calculator models the compounding effect of churn over time, compares scenarios, and shows the ROI of churn reduction investments. Reducing churn by even one percentage point can have a larger impact on long-term revenue than acquiring an equivalent number of new customers, because retained customers cost less to serve and tend to increase their spending over time. This calculator models that compounding effect, showing how churn reductions translate into revenue gains over 12, 24, and 36 months.
When This Page Helps
Most startups focus on acquisition, but churn is the silent killer. Even high growth can't outrun high churn long-term. This calculator reveals the true cost of churn and makes the business case for investing in retention, onboarding, customer success, and product improvements. Quantifying the revenue impact of churn gives your retention team a concrete business case for budget requests and prioritization.
How to Use the Inputs
- Enter your current monthly recurring revenue (MRR).
- Enter your current monthly churn rate.
- Enter a target (improved) churn rate for comparison.
- Enter the number of months to project.
- View the retention curves, revenue impact, and savings from churn reduction.
Formula used
Retained % = (1 − Monthly Churn)^Months
Annual Churn = 1 − (1 − Monthly Churn)^12
Revenue Lost to Churn = MRR × Churn Rate × 12 (annually)
LTV Impact = ARPU × GM × (1/ChurnA − 1/ChurnB)Example Calculation
Result: Current: 29% retained, Target: 48% retained — $19K MRR saved
At 5% monthly churn: after 24 months, retained = (1-0.05)^24 = 29.2%. At 3%: retained = (1-0.03)^24 = 48.1%. Starting at $100K MRR, the difference is $18,900/month in retained revenue by month 24.
Tips & Best Practices
- Every 1% reduction in monthly churn has outsized impact because churn compounds. Model it, don't guess.
- Track logo churn (% of customers) separately from revenue churn (% of MRR). They tell different stories.
- Net revenue retention (NRR) above 100% means expansion offsets churn. Aim for NRR > 110% in SaaS.
- Churn concentrates in the first 90 days. Invest heavily in onboarding to reduce early-lifecycle churn.
- Voluntary churn (cancellations) and involuntary churn (failed payments) require different solutions.
- Calculate the ROI of retention investments: cost of churn reduction vs. revenue saved.
The Compound Impact of Churn
Churn is exponential, not linear. Losing 5% of customers each month doesn't mean losing 60% per year — it means losing 46%. But this also means that reducing churn has compound benefits. A 2-percentage-point improvement early on results in dramatically different outcomes over 2-3 years.
The Churn-Growth Curve
At high churn rates, there's a growth ceiling where new customer additions equal churn losses. Formula: Max MRR = New MRR per Month / Churn Rate. A 5% churn rate with $10K new MRR/month has a ceiling of $200K MRR. Drop to 3% and the ceiling rises to $333K. Zero churn = unlimited growth.
Building a Retention Playbook
Effective churn reduction targets: (1) Onboarding — get users to "aha moment" in first week. (2) Engagement — identify leading indicators of churn and intervene. (3) Payment recovery — dunning for failed payments can save 20-40% of involuntary churn. (4) Win-back — re-engage churned users with targeted offers.
Sources & Methodology
Last updated:
Methodology
This worksheet treats churn as a compounding retention problem on an existing revenue cohort. It applies the user-entered monthly churn rates to the starting MRR over the selected period, compares the retained-revenue curves, and reports the difference in ending MRR and cumulative revenue retained under the two scenarios.
It does not model new sales, expansion revenue, seasonality, or pricing changes. The output is most useful for comparing the retention effect of one churn assumption against another on the same starting cohort.
Sources
- Chart: Customer Churn Rate (ChartMogul) — ChartMogul guidance on customer churn and the compound relationship between monthly and annual churn.
- Understanding MRR movements (ChartMogul) — ChartMogul reference for the subscription movement categories behind recurring-revenue changes.
Frequently Asked Questions
Annual = 1 − (1 − Monthly)^12. So 5% monthly ≈ 46% annual, not 60% (which is the common mistake of multiplying by 12). Monthly = 1 − (1 − Annual)^(1/12). Always use the compound formula, not simple multiplication.
For SaaS: <2% monthly (enterprise), <5% monthly (SMB), <7% monthly (consumer). Annual benchmarks: <10% annual gross churn for enterprise SaaS is excellent. Net revenue retention above 110% (expansion offsetting churn) is top-tier.
Logo churn = % of customers who cancel. Revenue churn = % of MRR lost. If small customers churn but large ones stay, revenue churn < logo churn. If your biggest customer cancels, revenue churn >> logo churn. Track both but prioritize revenue churn.
Top causes: poor onboarding, product not solving the core problem, lack of engagement, better competitor, price sensitivity, and involuntary churn (payment failures). The first 90 days have the highest churn risk — activation and onboarding quality drives retention.
Net negative churn means expansion revenue from existing customers (upsells, cross-sells, price increases) exceeds revenue lost to contraction and cancellation. Gross churn might be 3%, but expansion adds 5%, so net churn = −2%. Net negative churn creates exponential growth even without new customers.
Calculate the annual revenue saved from a 1% churn reduction, then invest up to that amount in retention programs. Example: $100K MRR at 5% churn = $600K annual churn loss. At 4% = $480K. Saving $120K/year justifies $60-80K in customer success investment.