FinToolSuite

SaaS Revenue Calculator

Updated April 20, 2026 · Financial Health · Educational use only ·

SaaS revenue trajectory.

Calculate SaaS cumulative revenue and ending MRR over a period with monthly growth rate. Enter projection months and see the result instantly.

What this tool does

This tool calculates SaaS cumulative revenue, ending MRR, and ARR from current MRR, monthly growth rate, and projection months.


Enter Values

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Formula Used
Current MRR
Monthly growth
Months

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Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

SaaS revenue compounds when monthly growth stacks. Current MRR grows at a monthly rate over a projection period. The calculator shows cumulative revenue captured over the projection (sum of all monthly MRR values) and the ending MRR at period end - the two numbers most investors ask.

50k current MRR at 8% monthly growth over 12 months compounds to 126k MRR at month 12, 1.51M annual run rate. Total cumulative revenue over the 12 months is about 957k - much more than the 600k naive estimate from starting MRR × 12. Compound growth is the reason SaaS valuations stretch into high multiples.

The calculator assumes steady growth. Real SaaS businesses see growth rates shift quarter-to-quarter based on hires, product launches, market conditions. Use for directional forecasting; do not use for commitments to investors or board. For committed forecasts, layer assumed growth rates by quarter rather than constant monthly.

Run it with sensible defaults

Using current mrr of 50,000, monthly growth of 8%, projection months of 12 months, the calculation works out to 948,856.32. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Current MRR, Monthly Growth %, and Projection Months — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

How the math works

Cumulative revenue = MRR × ((1 + growth)^months - 1) ÷ growth. Ending MRR = MRR × (1 + growth)^months. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

What the score tells you

Headline financial numbers — income, savings, debt — each tell part of the story. This calculation stitches several together into a single read you can track over time. The value is in the direction, not the absolute number.

What this doesn't capture

The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.

Example Scenario

££50,000 MRR growing at 8% over 12 months = $948,856.32.

Inputs

Current MRR:£50,000
Monthly Growth %:8
Projection Months:12
Expected Result$948,856.32

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

Cumulative revenue = MRR × ((1 + growth)^months - 1) ÷ growth. Ending MRR = MRR × (1 + growth)^months.

Frequently Asked Questions

Why so much more than MRR × 12?
Compounding. Growth stacking means each month's MRR is higher than previous. 50k × 12 = 600k assumes flat MRR. Real trajectory with 8% monthly growth sees MRR end at 126k - cumulative revenue captures this uplift.
Is 8% monthly growth realistic?
For early-stage SaaS (under 100k MRR), 10-20% monthly is achievable and expected. Growth stage (100k-1M MRR): 5-10%. Scale (1M-10M MRR): 3-5% monthly. Mature (above 10M MRR): 1-3%. Growth slows predictably with scale.
ARR or MRR for investor discussions?
Both - ARR is the headline valuation number (what the public SaaS market trades on), MRR is the operating metric. Most investor decks lead with ARR and reference MRR growth rate. For an 100k MRR business, ARR is 1.2M - cleaner for discussion.
Why not use annual growth?
Annual growth rates hide decelerations. A business at 120% YoY growth might be slowing from 15% to 5% monthly during the year - annual number doesn't reveal this. Monthly growth rate trends are the leading indicator investors watch.

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