happytails.ai

Bandwidth delay product calculator

Open Bandwidth delay product calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "bandwidth-delay-product-calculator",
  "category": "developer-tools",
  "built": true,
  "requirements": "Bandwidth multiplied by round-trip time estimates the data in flight. Eight bits make one byte; decimal and binary prefixes are distinct. The whole-byte result rounds upward. An optional receive window gives a theoretical throughput ceiling. Zero round-trip time has no finite window-derived ceiling. Results that exceed precise whole-byte representation are rejected. This does not measure throughput, losses or congestion control and is not a router buffer sizing recommendation. Runs locally without uploads. Limit: 500000 combined input characters, 1000 services and 5000 conflicting pairs. Complete JSON and JSON Pointer CSV exports are each capped at 2000000 characters; CSV contains at most 200000 typed values. Preview shows at most 200 rows. Calculations stop after 10 seconds. Downloads retain your source inputs, units, assumptions and complete results.",
  "implementation": {
    "fields": [
      {
        "key": "bandwidth",
        "label": "Bandwidth",
        "value": "100",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24,
        "help": "Use 0 to 1000000000000 in the selected bandwidth unit."
      },
      {
        "key": "bandwidthUnit",
        "label": "Bandwidth unit",
        "value": "Mbps",
        "type": "select",
        "values": [
          "bps",
          "kbps",
          "Mbps",
          "Gbps",
          "Tbps",
          "B/s",
          "kB/s",
          "MB/s",
          "GB/s",
          "KiB/s",
          "MiB/s",
          "GiB/s"
        ]
      },
      {
        "key": "roundTripTime",
        "label": "Round-trip time",
        "value": "50",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24,
        "help": "Use 0 to 86400 in the selected time unit. Enter round-trip time, not one-way delay."
      },
      {
        "key": "timeUnit",
        "label": "Time unit",
        "value": "ms",
        "type": "select",
        "values": [
          "s",
          "ms",
          "us"
        ]
      },
      {
        "key": "receiveWindowBytes",
        "label": "Receive window (bytes), optional",
        "value": "",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24,
        "help": "Leave empty to omit the window comparison, or enter a whole number from 0 to 9007199254740991."
      }
    ],
    "registrationFamily": "network-planning",
    "input": false,
    "presentation": "metrics",
    "note": "Bandwidth multiplied by round-trip time estimates the data in flight. Eight bits make one byte; decimal and binary prefixes are distinct. The whole-byte result rounds upward. An optional receive window gives a theoretical throughput ceiling. Zero round-trip time has no finite window-derived ceiling. Results that exceed precise whole-byte representation are rejected. This does not measure throughput, losses or congestion control and is not a router buffer sizing recommendation. Runs locally without uploads. Limit: 500000 combined input characters, 1000 services and 5000 conflicting pairs. Complete JSON and JSON Pointer CSV exports are each capped at 2000000 characters; CSV contains at most 200000 typed values. Preview shows at most 200 rows. Calculations stop after 10 seconds. Downloads retain your source inputs, units, assumptions and complete results.",
    "inputMaxLength": 500000,
    "inputErrorCode": "NETWORK_PLANNING_INPUT",
    "example": {
      "input": "",
      "options": {
        "bandwidth": "100",
        "bandwidthUnit": "Mbps",
        "roundTripTime": "50",
        "timeUnit": "ms",
        "receiveWindowBytes": ""
      }
    },
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 500000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Up to 500,000 characters. Review the settings before running.",
      "helpParts": [
        "Up to 500,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Estimate in-flight data from bandwidth and round-trip time, with an optional receive-window comparison.

How to use Bandwidth delay product calculator
  1. Enter bandwidth and select its bit or byte unit.
  2. Enter round-trip time, select its unit and optionally enter a receive window in bytes.
  3. Compare the in-flight data estimate and window limit, then download the complete report.

Useful next steps

Use round-trip time and explicit units

At 100 Mbps and 50 ms round-trip time, the bandwidth-delay product is 5000000 bits or 625000 bytes. One byte contains eight bits. Decimal prefixes such as MB and binary prefixes such as MiB are different; the selected units control the calculation.

A window ceiling is not measured throughput

The optional receive-window ceiling divides window bytes by round-trip seconds and converts to bits per second. Actual throughput can also be limited by congestion control, loss, overhead and application behavior. A zero round-trip time has no finite window-derived ceiling. This estimate is not router buffer sizing advice.