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💰 Financial · Rex's Toolbox

MRR Growth Calculator

Project MRR and ARR forward at your growth rate.

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Rex says

Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.

Try a scenario

Click to load — tweak from there.

Inputs

Result

Projected MRR

$82,209

Projected ARR

$986,504

MRR added over the period

$40,209

Net monthly growth rate

9.38%

Current ARR

$504,000

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How to use this

  1. 1Enter current mrr ($).
  2. 2Enter new mrr added per month ($).
  3. 3Enter monthly revenue churn (%).
  4. 4Enter months to project.
  5. 5Read your projected mrr on the right — it updates as you type.
  6. 6Hit Share to keep the scenario or send it to someone.

About this calculator

Compounding is unforgiving in both directions. Net MRR growth after churn is what compounds — a 12% gross add against 5% churn compounds at 7%, not 12%.

FormulaMRR after n months = MRR × (1 + net growth)ⁿ. ARR = MRR × 12.

Worked example

Using the values the calculator loads with:

Inputs

  • Current MRR: 42000 $
  • New MRR added per month: 5200 $
  • Monthly revenue churn: 3 %
  • Months to project: 12

Results

  • Projected MRR: $82,208.70
  • Projected ARR: $986,504.44
  • MRR added over the period: $40,208.70
  • Net monthly growth rate: 9.38%
  • Current ARR: $504,000.00

What each field means

Inputs

Current MRR ($)
The current mrr used in the calculation, measured in $. Starts at 42000 $ so you have a working example on load.
New MRR added per month ($)
The new mrr added per month used in the calculation, measured in $. Starts at 5200 $ so you have a working example on load.
Monthly revenue churn (%)
The monthly revenue churn used in the calculation, measured in %. Starts at 3 % so you have a working example on load. Accepted range: 0–50 %.
Months to project
The months to project used in the calculation. Starts at 12 so you have a working example on load. Accepted range: 1–60.

Results

Projected MRR
Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Projected ARR
Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
MRR added over the period
Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Net monthly growth rate
Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Current ARR
Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

How does the mrr growth calculator work?

Compounding is unforgiving in both directions. Net MRR growth after churn is what compounds — a 12% gross add against 5% churn compounds at 7%, not 12%. The underlying maths is: MRR after n months = MRR × (1 + net growth)ⁿ. ARR = MRR × 12.

What do I need to enter?

4 values: current mrr, new mrr added per month, monthly revenue churn, and months to project. Each field starts with a sensible default, so you can change one number at a time and watch the result move.

What does the projected mrr result mean?

It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.

Is this calculator free, and do I need an account?

Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.

How accurate is the result?

It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.

Who is this tool for?

It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.

Accuracy and limitations

  • Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
  • Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
  • This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.

Related tools

Churn Rate Calculator

Customer churn, revenue churn, and retention.

Burn Rate and Runway Calculator

Months of cash left at your current spend.

Customer Lifetime Value Calculator

LTV, LTV:CAC ratio, and average customer lifespan.

Cite this calculator

Writing about this topic? Grab a citation — every link helps keep these tools free.

APA
RevenueLab. (2026). MRR Growth Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/mrr-growth
HTML
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/mrr-growth" target="_blank" rel="noopener">MRR Growth Calculator — RevenueLab</a> (2026).</p>
Markdown
Source: [MRR Growth Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/mrr-growth) (2026).
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