MongoDB Atlas has the richest pricing matrix of any managed database in our comparison, which is exactly why it confuses people. There are three distinct layers. Here is how each works, as of June 2026.
The three layers
| Layer | Tier | Price | Best for |
|---|---|---|---|
| Free | M0 | $0 (512 MB) | Learning, prototypes |
| Usage-based | Flex | $8-30/month | Small or variable workloads |
| Dedicated | M10-M700 | Per hour, from ~$57/month | Production with reserved resources |
The free M0 tier gives 512 MB of storage and roughly 100 ops/second — fine for a demo, not for production. The Flex tier (which replaced the old M2/M5 shared tiers and the deprecated Serverless option in 2025) costs $8/month at the floor and is capped at $30/month, scaling by operations per second. Above that you move to dedicated clusters.
Dedicated cluster tiers (AWS us-east-1)
This is where most production spend lands. Each tier bundles RAM, vCPU and a default storage allotment, billed per hour:
| Tier | RAM | vCPU | Included storage | Hourly | Monthly (x730) |
|---|---|---|---|---|---|
| M10 | 2 GB | 2 (burstable) | 10 GB | $0.08 | ~$57 |
| M20 | 4 GB | 2 (burstable) | 20 GB | $0.20 | ~$147 |
| M30 | 8 GB | 2 | 40 GB | $0.54 | ~$388 |
| M40 | 16 GB | 4 | 80 GB | $1.04 | ~$747 |
Note how steep the jumps are: M20 to M30 nearly triples the cost. MongoDB’s own published monthly figures round slightly differently from hourly x 730, but they match to within a few dollars.
What is NOT in the tier price
The hourly tier rate covers compute and the default storage. Backup (Atlas Cloud Backup, about $0.14-0.19/GB-month) and data transfer (same-region $0.01/GB, internet egress $0.09/GB) bill on top. For a busy cluster these can add meaningfully, so budget for them.
Atlas vs DocumentDB
If you only need MongoDB API compatibility on AWS, Amazon DocumentDB is an alternative priced like RDS (instance-hour plus storage and I/O). See the full Atlas vs DocumentDB comparison — DocumentDB has no free tier, but a db.t3.medium runs about $80/month.
Bottom line
Start on M0 or Flex, move to M10 (~$57/month) for your first real production cluster, and remember backup and transfer are extra. Model a tier in the cost estimator and read the full MongoDB pricing breakdown. Prices are a June-2026 snapshot; verify on the MongoDB pricing page.