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Azure Site Recovery Calculator

Cost Azure Site Recovery protection and check whether your replication bandwidth can keep up with daily churn.

About Azure Site Recovery Calculator

Site Recovery cost has three parts: a flat fee per protected instance, the replica managed disks and cache storage sitting in the target region, and the cross-region data the replication generates. The bandwidth check matters just as much — churn spread evenly over a day still needs a sustained rate, and if the link cannot carry it the recovery point objective silently degrades. Teams size disaster recovery on storage cost and forget that a 25-VM estate with 20 GB of daily churn each needs roughly 46 Mbps sustained, all day; the first 31 days of protection are free per instance, so short-lived test failovers cost only storage. Confirm the current fees in the Azure pricing calculator.

Formula

Azure Site Recovery

required Mbps = daily churn GB × VMs × 8,000 ÷ 86,400 seconds; monthly = instance fees + (replica disk + cache) × storage price + monthly churn × cross-region data price.

churn
Data written per VM per day, which is what must cross the wire
cache storage
Staging account on the source side that buffers changes before upload
86,400
Seconds in a day, converting daily churn into a sustained bit rate

Worked example

With the default values below, Azure Site Recovery Calculator returns Monthly Cost of $1,589.20. Change any input above and every figure here is recalculated in your browser.

Inputs used

VMs protectedaccepts 1–5,000 VMs
25 VMs
Protected instance feeaccepts 0–500 USD/month
25 USD/month
Replica disk size per VMaccepts 1–100,000 GB
500 GB
Replica storage price per GBaccepts 0–10 USD/GB-month
0.048 USD/GB-month
Cache storage as a share of diskaccepts 0–100 %
10 %
Daily churn per VMaccepts 0–100,000 GB/day
20 GB/day
Replication bandwidth availableaccepts 1–100,000 Mbps
500 Mbps
Cross-region data price per GBaccepts 0–5 USD
0.02 USD

Results

Monthly Cost
$1,589.20
Protected Instance Fees
$625.00
Replica and Cache Storage
$660.00
Cross-region Data Charge
$304.20
Bandwidth Needed for Churn
46.3 Mbps
Bandwidth Utilisation
9.3%
Replication Verdict
Bandwidth is sufficient for the stated churn

Step by step

  1. 1Values used
  2. 2Azure Site Recovery
  3. 3Monthly Cost= 1,589.20
  4. 4Protected Instance Fees= 625.00
  5. 5Replica and Cache Storage= 660.00
  6. 6Cross-region Data Charge= 304.20
  7. 7Bandwidth Needed for Churn= 46.3 Mbps
  8. 8Bandwidth Utilisation= 9.3

Assumptions and limits

  • The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Azure Site Recovery calculated?

required Mbps = daily churn GB × VMs × 8,000 ÷ 86,400 seconds; monthly = instance fees + (replica disk + cache) × storage price + monthly churn × cross-region data price. Site Recovery cost has three parts: a flat fee per protected instance, the replica managed disks and cache storage sitting in the target region, and the cross-region data the replication generates. The bandwidth check matters just as much — churn spread evenly over a day still needs a sustained rate, and if the link cannot carry it the recovery point objective silently degrades.

Why does Azure Site Recovery matter?

Teams size disaster recovery on storage cost and forget that a 25-VM estate with 20 GB of daily churn each needs roughly 46 Mbps sustained, all day; the first 31 days of protection are free per instance, so short-lived test failovers cost only storage. Confirm the current fees in the Azure pricing calculator.

What values do I need to enter?

This calculator takes 8 inputs: VMs protected, Protected instance fee, Replica disk size per VM, Replica storage price per GB, Cache storage as a share of disk, Daily churn per VM, Replication bandwidth available, Cross-region data price per GB. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Related Calculators

Azure Site Recovery Calculator – Calculate Monthly Cost