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Free SaaS MRR growth calculator to model net new MRR, GRR, NRR, ARR run-rate, and forward MRR trajectory. Use it to improve SaaS growth planning with retention-aware revenue math.
Last updated: April 15, 2026
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Starting Revenue Base
Monthly MRR Movements
Monthly MRR Growth Rate
16.67%
Net new MRR: $30,000
Ending MRR
$210,000
ARR Run-Rate
$2,520,000
Gross Revenue Retention
88.89%
Net Revenue Retention
101.11%
Projected MRR (Horizon)
$1,335,305.91
Performance: Strong
SaaS growth is durable. Maintain acquisition pace and focus on reducing contraction to improve valuation multiples. In balanced mode, pair CAC payback targets with expansion-led growth to keep MRR quality high.
MRR Modeling Tips:
Present growth quality with GRR/NRR context.
Test acquisition/retention assumptions before committing spend.
Show upside from customer success investments.
Build repeatable plays for account growth.
Improve confidence in predictable growth story.
Tie GTM metrics to monthly revenue outcomes.
With $180k starting MRR and balanced monthly movement assumptions:
Net New MRR
$30,000
Growth Rate
16.67%
NRR
101.11%
ARR Run-Rate
$2,520,000
This calculator uses an MRR bridge approach: start-of-month revenue plus expansion and new revenue, minus churn and contraction. It then evaluates retention quality and projects forward trajectory.
Net New MRR = New MRR + Expansion MRR - Churned MRR - Contraction MRRGrowth quality improves when NRR exceeds 100% while GRR remains stable.
Share it with SaaS operators and revenue teams