Gross Revenue Retention Calculator
Retained revenue from starting base.
Calculate gross revenue retention from starting MRR, churned MRR, and contraction MRR. Shows grr from starting mrr and churned mrr from the values you enter.
What this tool does
This tool calculates GRR from starting MRR, churned MRR, and contraction MRR.
Enter Values
Formula Used
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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.
Gross Revenue Retention (GRR) is the percentage of starting-period MRR still active at period end, excluding any expansion from existing customers. GRR caps at 100% - it measures only churn and contraction, never upside. Best-in-class SaaS delivers 90-95% GRR; below 85% signals retention problems that compound quickly.
100k starting MRR, 3k churned (cancellations), 2k contraction (downgrades) = 95k remaining. GRR = 95%. Healthy. Over 12 months at that rate, 46% of starting MRR would churn away without any replacement - which is why new sales matter so much. At 85% GRR, 68% would be lost annually - unsustainable territory.
GRR differs from NRR critically. GRR measures how well you keep what you have; NRR measures the same plus upside from expansion. Together they reveal what's working: low GRR + high NRR means you're churning small customers while expanding within survivors; high GRR + low NRR means retention is fine but upsell is weak.
Quick example
With starting mrr of 100,000 and churned mrr of 3,000 (plus contraction mrr of 2,000), the result is 95.00%. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Starting MRR, Churned MRR, and Contraction MRR. 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.
What's happening under the hood
GRR = (starting MRR - churn - contraction) ÷ starting MRR × 100. Capped at 100% - expansion excluded. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
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.
£100,000 £ MRR - £3,000 £ churn - £2,000 £ contraction = 95.00%.
Inputs
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
GRR = (starting MRR - churn - contraction) ÷ starting MRR × 100. Capped at 100% - expansion excluded.
References
Frequently Asked Questions
What's a good GRR?
Why is GRR capped at 100%?
Monthly vs annual GRR?
How does GRR drive valuation?
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