Storage Replication Cost Calculator (GB-month + transfer)

Replication and multi-region storage can add meaningful transfer or feature charges. Estimate monthly replication cost and compare baseline vs peak replication volume.

Inputs

Replicated data (GB / month)
~82.24 GB/day, 7.61 Mbps.
Changed data (GB / day)
Events (per day)
Avg payload (KB)
Est 91.55 GB/day.
Est 2,432 GB/month.
Price ($ / GB)
Replication can be priced as cross-region transfer or as a feature fee.
Scenario presets

Results

Estimated monthly replication cost
$50.00
Replicated volume
2,500 GB

How to get your inputs

  • Inputs: use billing exports, metrics, or logs to get real counts/GB where possible.
  • Units: convert throughput (Mbps) or rates (RPS) into monthly units when needed.
  • Scenarios: build a baseline and a high-usage scenario to avoid under-budgeting.

Result interpretation

  • Replication cost scales with changed data, not total stored GB.
  • If replication spikes during backfills or migrations, model a peak month separately.

Common mistakes

  • Using a single average and ignoring peak/incident scenarios.
  • Double-counting or missing adjacent line items (transfer, logs, retries).

Scenario planning

Scenario Changed GB Replication mode Notes
Baseline Average Ongoing Steady writes
Peak High Backfill One-time burst

Validate after changes

  • Compare your estimate to the first real bill and adjust assumptions.
  • Track the primary driver metric (requests/GB/count) over time.

Next steps

Guides All calculators Guide: S3 replication cost Estimate replication GB/month S3 CRR vs SRR cost Cross-region transfer
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Example scenario

  • 2,500 GB/month replicated at $0.02/GB -> $50/month (transfer/feature fee estimate).
  • 50 GB/day of changed data replicated cross-region (~1,520 GB/month) at $0.01/GB -> about $15/month (replication fee only).
  • Peak 180% scenario highlights backfill or migration bursts.

Included

  • Replication cost estimate from replicated GB/month and a $/GB pricing assumption.
  • Works for cross-region replication, backup copy traffic, or sync workloads.
  • Optional daily change and event estimators.
  • Baseline vs peak scenario table for replication spikes.

Not included

  • Replica storage costs (model separately).
  • Provider-specific billing rules for replication direction, request pricing, and minimum charges.

How we calculate

  • Monthly cost = replicated GB per month x price per GB.
  • Use the GB that actually changes/copies per month (often driven by writes, not the full dataset size).
  • Replication may be billed as cross-region transfer, a per-GB feature fee, or both depending on product.
  • Add replica storage, request fees, and any origin egress separately if you pay them.

FAQ

Should I use total stored GB or changed GB?
Use the GB that actually replicates per month (often driven by writes/changes, not the entire dataset).
Does this include extra storage in the replica region?
No. Model replica storage separately using object storage or database storage tools.
Is replication billed one-way or both ways?
It depends on the product. Many replication features bill for data copied out of the source region only. Check provider docs for directionality.
Do I need to include request costs?
Sometimes. Replication can increase PUT/GET or list operations and those may be billed. If requests are material for your workload, estimate them in the object storage calculator.
How can I estimate changed GB per month?
Start from write volume (GB/day) or batch sizes, then multiply by days in the month. For event-driven workloads, use logs/metrics to estimate average write throughput.

Related tools

Guide: S3 replication cost Estimate replication GB/month S3 CRR vs SRR cost Cross-region transfer Object storage cost

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Disclaimer

Educational use only. Not legal, financial, or professional advice. Results are estimates based on the inputs and assumptions shown on this page. Verify pricing and limits with your providers and documentation.

Last updated: 2026-02-23