# The Monthly MRR Bridge Every SaaS Founder Should Review

> Turn starting MRR, new sales, expansion, churn, and contraction into one clean revenue story with growth and retention metrics.

- URL: https://www.pyalm.com/blog/mrr-bridge-founder-review
- Author: Fadhil Abdulla
- Category: Founder Guides
- Published: 2026-07-21
- Updated: 2026-07-21

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A single ending-MRR number hides the story of the month. A bridge explains how you got there.

## The five parts of an MRR bridge

Start with last month's ending MRR, then record:

- **New MRR** from customers who started paying
- **Expansion MRR** from upgrades or added seats
- **Churned MRR** from customers who left
- **Contraction MRR** from downgrades or removed seats
- **Ending MRR** after all four movements

The reconciliation is:

`Ending MRR = starting MRR + new + expansion − churn − contraction`

If the bridge does not reconcile with billing, fix the definitions before interpreting the metrics.

## Net new MRR and growth

Net new MRR is the combined movement:

`New + expansion − churn − contraction`

Divide it by starting MRR to calculate monthly net MRR growth. A company can add strong new sales but produce weak net growth when churn and contraction consume most of the gains.

## Gross churn and NRR answer different questions

Gross MRR churn focuses on revenue lost from the starting base. Net revenue retention also gives the existing base credit for expansion:

`NRR = (starting MRR + expansion − churn − contraction) ÷ starting MRR`

NRR above 100% means expansion from existing customers exceeded their losses. It does not include new customers.

Build your monthly bridge with the free [MRR Growth Calculator](https://www.pyalm.com/free-tools/mrr-growth-calculator).

## Keep definitions stable

Decide how to handle paused accounts, credits, annual contracts, usage charges, and reactivations. Write those rules down. Changing a definition from month to month can create growth that exists only in the spreadsheet.

For annual contracts, teams often convert committed recurring subscription value into a monthly equivalent. One-off setup, hardware, consulting, and pass-through fees should usually stay outside MRR.

## Turn the bridge into action

Review the largest movements behind each line. Which channel created new MRR? Which feature or seat increase drove expansion? Which customer segment churned? Which downgrade reason is appearing repeatedly?

The bridge is valuable because every number connects to an operating conversation. It turns “MRR grew 4%” into a more useful statement: where growth came from, where revenue leaked, and what the team will change next month.