What this calculator does
Most business & marketing tools bury the answer under ads and jargon. The mrr & arr calculator shows the number first, the breakdown next, and the assumptions in plain language.
The MRR & ARR Calculator turns the five movement inputs — new, expansion, contraction, churned MRR and starting base — into net new MRR, quick ratio, and a forward projection. It's the calculation every board deck lives or dies by.
How to use the MRR & ARR Calculator
- Enter your five MRR movement numbers for the last full month.
- Set the starting MRR — where you began the month.
- Pick a projection window: 12 months for a plan, 36 for a fundraise.
The formula
net_new_mrr = new + expansion - contraction - churned; quick_ratio = (new + expansion) / (churned + contraction)
Worked example
$12k new + $4k expansion − $0.8k contraction − $2.5k churned = $12.7k net new MRR. On a $180k base that's 7% monthly growth, projecting to ~$405k MRR in 12 months.
Common mistakes
- Reporting gross new MRR instead of net new — hides churn problems.
- Mixing one-time revenue (setup fees, services) with recurring.
- A quick ratio under 1 means you're shrinking — don't gloss over it.
When to use it
Use monthly in your growth review, when negotiating a Series A, or before setting quotas for the next quarter.
Pro tips for the MRR & ARR Calculator
- Change one input at a time to see which lever actually moves the answer the most.
- Round-trip check: reverse the inputs to confirm the formula matches what you'd compute by hand.
- Bookmark this page: the URL and inputs are all you need to reproduce the exact result later.
Frequently asked questions
›MRR vs ARR — which do I use?
MRR for monthly ops, ARR for board decks and multiples. ARR = MRR × 12.
›What's a good quick ratio?
4+ is world-class, 2 is healthy, under 1 is contracting.
›Should I include annual contracts in MRR?
Yes — normalize by dividing the ACV by 12.
›Can I embed the MRR & ARR Calculator on my site?
Embedding isn't public yet, but you can link directly to this page — the URL is stable and shareable.
›Is the MRR & ARR Calculator free to use?
Yes. Every calculator on CalcPilot, including the MRR & ARR Calculator, is free with no sign-up, no watermark, and no export limit.
Embed this calculator
Drop the MRR & ARR Calculator into your own site or blog post. Free to use — a small “Powered by CalcPilot” link is appreciated.
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