> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/welcome/pricing/cloud-networking-pricing/burstable-95th.md).

# Burstable 95th

* **Usage Sampling**\
  Samples your bandwidth usage at regular intervals throughout a billing cycle. Samples are typically recorded every 5 minutes, showing usage at each point in time.
* **Percentile Calculation**\
  Ingress and egress are sampled separately. For each direction, the samples are sorted from highest to lowest and the top 5% are discarded; the highest remaining value is that direction's 95th percentile. The billable bandwidth is the larger of the two directions: `billable 95th = max(ingress 95th, egress 95th)`.
* **Predictable Costs**\
  Prevents unexpected charges from temporary traffic spikes, so you won't be overcharged for occasional usage peaks.

## Committed Bandwidth

The minimum bandwidth you commit to using each month. Higher committed amounts result in lower unit prices. If you use less than your commitment, you're still charged for the full committed amount. You can upgrade or downgrade the committed bandwidth at any time; changes take effect immediately.

## Overage

Usage that exceeds the committed bandwidth, billed separately per Mbps. Purchase an appropriate committed bandwidth amount to reduce overage costs.

## Burst Capability

Beyond your commitment, you can burst beyond the committed bandwidth for short periods (specific multiples vary by region) to handle traffic peaks. Usage beyond your commitment is billed but not rate-limited.

## Billing Details

<table><thead><tr><th width="175">Billing</th><th>Description</th></tr></thead><tbody><tr><td>Billing Method</td><td>Pay-as-you-go, including committed bandwidth and overage charges.</td></tr><tr><td>Billing Cycle</td><td>Monthly, calculated at the end of the month, billed on the 1st day of the next month.</td></tr><tr><td>Billing Items</td><td><ol><li>Committed bandwidth</li><li>Overage bandwidth — the 95th percentile bandwidth across all resources in the region or city.</li></ol></td></tr><tr><td>Billing Rules</td><td><ol><li>Committed fee = (Actual usage duration / Total duration) × Committed bandwidth × Committed price</li><li>Overage fee = (Actual 95th bandwidth − Committed bandwidth) × Overage price × (Actual usage duration / Total duration)</li><li>Total fee = Committed fee + Overage fee</li></ol></td></tr></tbody></table>

## Billing Example

If your committed bandwidth changes mid-month, calculate fees before and after the change separately. The 95th percentile value is calculated once across the entire month, then applied to each period at its respective rates.

{% hint style="info" %} <mark style="color:blue;">**Note**</mark>

<mark style="color:blue;">The monthly 95th percentile peak is calculated once from the full month's usage, not split by billing period.</mark>
{% endhint %}

#### Scenario

* On April 21st, committed bandwidth changes from `100 Mbps` to `500 Mbps`.
* At month end, the monthly 95th percentile peak is `600 Mbps`.
* `100 Mbps` committed price = `$300`/month; `500 Mbps` committed price = `$600`/month; overage price = `$1.50`/Mbps/month.

#### Calculation

* **April 1st – April 20th**
  1. Committed fee = `$300` / 30 × 20 = `$200.00`
  2. Overage fee = \[(`600 Mbps` − `100 Mbps`) × `$1.50`/Mbps] / 30 × 20 = `$500.00`
  3. Subtotal = `$200.00` + `$500.00` = `$700.00`
* **April 21st – April 30th**
  1. Committed fee = `$600` / 30 × 10 = `$200.00`
  2. Overage fee = \[(`600 Mbps` − `500 Mbps`) × `$1.50`/Mbps] / 30 × 10 = `$50.00`
  3. Subtotal = `$200.00` + `$50.00` = `$250.00`
* **Monthly total** = `$700.00` + `$250.00` = `$950.00`