Predict finish time

Predict finish time for a target race distance given a steady pace per kilometer.

Formula

finish_time = pace_seconds_per_km × distance_km

Enter distance in kilometers and pace in mm:ss format; output appears as hh:mm:ss (or mm:ss for short events).

When to use it

Plan marathon or half-marathon goals, estimate arrival times for relay legs, or answer “if I hold 4:30/km, how long is 21.1 km?”

Example

Half marathon (21.0975 km) at 5:00/km → about 1:45:29 total clock time, assuming even splits.

Limitations

Real races include pacing variation, aid stations, crowding, and elevation. Predictions assume you can maintain the entered pace for the entire distance — often optimistic for beginners on long courses.

This skill is available over A2A JSON-RPC and REST. When you already know the skill id and export, call execute directly—no discovery step required.

REST example

curl -sS -X POST https://toolplaza.app/api/helpers/execute \
  -H 'Content-Type: application/json' \
  -d '{"skillId":"pace__predict-finish","export":"predictFinishTime","args":[10,300]}'

A2A JSON-RPC example

Send POST https://toolplaza.app/api/a2a with:

{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "message/send",
  "params": {
    "message": {
      "messageId": "uuid",
      "role": "user",
      "parts": [
        {
          "kind": "text",
          "text": "ignored"
        }
      ]
    },
    "metadata": {
      "toolplaza": {
        "skillId": "pace__predict-finish",
        "export": "predictFinishTime",
        "args": [
          10,
          300
        ]
      }
    }
  }
}

Full Agent API guide · Skill schema