Blob Storage Cost Calculator

Calculator Inputs

Use the form below to model monthly blob storage cost in USD.

Responsive input grid: 3 columns, 2 columns, 1 column

Default rates are planning placeholders. Replace them with your provider’s current regional rates before using results for purchasing or chargeback decisions.

Raw stored data (GB)

Compression or dedupe savings (%)

Metadata overhead (%)

Snapshot or version overhead (%)

Monthly upload volume (GB)

Monthly download or egress (GB)

Read operations per month

Write operations per month

List operations per month

Average retention (days)

Monthly growth (%)

Reserve or overhead buffer (%)

Access tier

Redundancy profile

Storage rate (USD per GB-month)

Retrieval rate (USD per GB)

Egress rate (USD per GB)

Read request rate (USD per 10,000)

Write request rate (USD per 10,000)

List request rate (USD per 10,000)

Example Data Table

Scenario	Tier	Effective Storage (GB)	Monthly Egress (GB)	Read / Write / List Ops	Estimated Monthly Cost
Startup media library	Hot	1,240	300	650,000 / 120,000 / 15,000	$74.80
Analytics backup set	Cool	12,600	800	3,500,000 / 450,000 / 60,000	$284.40
Compliance archive vault	Archive	80,000	120	250,000 / 90,000 / 10,000	$410.60
AI training artifacts	Hot	25,000	5,200	6,500,000 / 1,300,000 / 140,000	$1,128.90

These rows are illustrative examples for planning and documentation.

Formula Used

1) Effective storage
Effective Storage = Raw Storage × (1 − Savings %) × (1 + Metadata % + Snapshot %)

2) Storage cost
Storage Cost = Effective Storage × Storage Rate × Redundancy Multiplier

3) Request cost
Read Cost = (Read Ops ÷ 10,000) × Read Request Rate
Write Cost = (Write Ops ÷ 10,000) × Write Request Rate
List Cost = (List Ops ÷ 10,000) × List Request Rate

4) Retrieval and egress
Retrieval Cost = Monthly Download × Retrieval Rate
Egress Cost = Monthly Download × Egress Rate

5) Early deletion charge
Early Deletion Cost = Monthly Storage Charge × ((Minimum Tier Days − Retention Days) ÷ 30), when retention is below the tier minimum

6) Final monthly total
Subtotal = Storage + Requests + Retrieval + Egress + Early Deletion
Monthly Total = Subtotal + (Subtotal × Reserve %)

7) Projected annual cost with growth
When growth is zero: Annual Projection = Monthly Total × 12
When growth is positive: Annual Projection = Monthly Total × ((1 + g)^12 − 1) ÷ g

How to Use This Calculator

Enter your raw stored data in gigabytes.
Add savings from compression or deduplication.
Include metadata and snapshot overhead percentages.
Enter expected monthly download volume and API requests.
Choose the intended access tier and redundancy profile.
Load sample rates or replace them with your current regional pricing.
Set average retention days, growth rate, and any reserve buffer.
Press the calculate button to display totals, comparison rows, and the Plotly graph above the form.
Use the CSV or PDF export buttons after calculation to share the result.

Frequently Asked Questions

1) What does this calculator include?

It estimates storage, retrieval, request, egress, early deletion, and reserve overhead. You can also model redundancy effects, compression savings, snapshots, and annual growth.

2) Are the default rates official?

No. Default numbers are sample inputs for planning. Replace them with your provider’s current regional pricing, replication surcharge, and request rates before making procurement decisions.

3) Why does effective storage differ from raw data?

Raw data can shrink through compression or deduplication, then grow again from metadata, snapshots, and versioning. Billing usually follows stored footprint, not only original file size.

4) When does early deletion matter?

Cool and archive-style tiers often require minimum retention periods. Deleting or overwriting sooner can create extra charges, which this calculator approximates using the remaining minimum days.

5) Should upload traffic be billed?

Many platforms do not bill ingress, but some workflows create write-request costs or related service charges. Keep upload volume for context and adjust rates if your vendor bills it.

6) How should I choose a tier?

Use access frequency, retrieval size, and retention length together. Hot tiers favor frequent reads. Cooler tiers favor long retention. Archive works best for rare access and stable data.

7) What is reserve overhead?

Reserve overhead adds a planning buffer for taxes, monitoring, support, currency movement, or unmodeled requests. It improves budgeting when invoices vary slightly from baseline assumptions.

8) Can I export results?

Yes. After calculation, use CSV for spreadsheet work and PDF for sharing assumptions, totals, and component costs with finance, engineering, or procurement teams.