Bandwidth Cost Calculator

Calculator Inputs

Monthly Transfer

Transfer Unit

Price per GB

Committed Bandwidth (Mbps)

Actual 95th Percentile (Mbps)

Enter 0 to auto-estimate from transfer volume.

Burst Factor

Overage Rate per Mbps

Fixed Port Fee

CDN or Peering Surcharge

Support or Monitoring Fee

Discount Rate (%)

Tax Rate (%)

Billing Days

Contract Months

Currency Symbol

Example Data Table

Scenario	Transfer	Commit	Actual 95th	Price per GB	Overage Rate	Estimated Monthly Cost
Startup SaaS	8 TB	150 Mbps	180 Mbps	$0.0600	$6.00/Mbps	$933.52
Video Platform	25 TB	500 Mbps	620 Mbps	$0.0450	$7.00/Mbps	$2,404.46
Enterprise Backup	60 TB	700 Mbps	760 Mbps	$0.0350	$8.50/Mbps	$3,196.46
Global CDN Edge	120 TB	1400 Mbps	1600 Mbps	$0.0280	$9.00/Mbps	$6,245.80

Formula Used

Transfer in GB = Entered Transfer × Unit Conversion Factor

Average Throughput (Mbps) = (Transfer GB × 8000) ÷ (Billing Days × 24 × 3600)

Estimated 95th Percentile Mbps = Average Throughput × Burst Factor

Overage Mbps = max(Actual 95th Percentile − Committed Mbps, 0)

Usage Cost = Transfer GB × Price per GB

Overage Cost = Overage Mbps × Overage Rate per Mbps

Subtotal Before Discount = Usage Cost + Overage Cost + Port Fee + Surcharge + Support Fee

Discount Amount = Subtotal Before Discount × Discount Rate

Tax Amount = (Subtotal Before Discount − Discount Amount) × Tax Rate

Total Monthly Cost = Subtotal After Discount + Tax Amount

Annual Cost = Total Monthly Cost × 12

Contract Projection = Total Monthly Cost × Contract Months

This calculator combines usage billing, commit-based overage billing, fixed connectivity fees, contractual discounts, and taxes into one financial estimate.

How to Use This Calculator

Enter your monthly transfer amount and select GB, TB, or PB.
Provide the price per GB charged by your provider.
Enter your committed bandwidth in Mbps.
Add your actual 95th percentile value, or leave it at 0.
Use a burst factor if peak usage must be estimated.
Enter overage rate, port fee, surcharge, and support fee.
Set discount, tax, billing days, and contract months.
Click the button to view costs, breakdowns, and the scenario graph.
Download the result table as CSV or PDF when needed.

FAQs

1. What does bandwidth cost mean in this calculator?

It means the total financial impact of moving data and sustaining network capacity. The estimate includes per-GB transfer charges, commit overages, port costs, support charges, discounts, and taxes.

2. Why is 95th percentile bandwidth included?

Many providers bill burstable connections using 95th percentile usage. This method ignores small spikes but still captures sustained peaks, making it common for transit and colocation invoices.

3. What happens if I leave actual 95th percentile at zero?

The tool estimates peak usage from your monthly transfer and burst factor. This is useful for planning, although an invoice-based peak reading is usually more accurate.

4. Does the calculator support discounts and taxes together?

Yes. It first calculates the subtotal, then subtracts the discount, and finally applies tax to the discounted amount. That gives a more realistic payable monthly total.

5. Which unit conversion does the calculator use?

It converts TB to 1024 GB and PB to 1,048,576 GB. This binary approach is commonly used in infrastructure planning and many hosting environments.

6. What does effective cost per GB show?

It spreads all monthly costs across your transferred gigabytes. That helps compare providers fairly, especially when one vendor has lower transfer pricing but higher fixed fees.

7. Why include contract months?

Contract duration helps estimate long-term spend. It is useful when budgeting annual renewals, evaluating multi-month commitments, or comparing providers with different term discounts.

8. Can I use this calculator to compare vendors?

Yes. Change the rate, fees, discount, and tax inputs for each vendor. Then compare monthly totals, overage exposure, and effective cost per GB side by side.