calculate_pace
Calculate running pace, finish time, or distance. Provide any two of: distance, time, pace.
LABSCO SUMMARY
The formulas are named, which is the whole reason to use it.
Ask a model to predict a marathon time from a 10K and it will produce a plausible number. Here the answer comes from Riegel, the zones come from Karvonen, and the tool says so — so a runner can check the method rather than trust the arithmetic.
What it is
A running toolkit for agents. Four tools compute locally with no API call — pace, race prediction, heart-rate zones and a countdown — and six query RunDida's public library of calculators, training guides and marathon events.
What you get
- calculate_pace works out pace, finish time or distance from any two of the three
- predict_race applies the Riegel formula with VO2max estimation, from a known race result
- heart_rate_zones computes training zones by the Karvonen method from age and resting heart rate
- marathon_countdown returns the countdown to a specific event
- list_tools and get_tool browse the running calculators with their FAQs and sources
- list_guides and get_guide browse the training guides
- list_marathons and get_marathon cover events with dates, locations, course profile and race-day weather
- The compute tools run locally with no latency; the data tools fetch from the RunDida API with 30-minute caching
Requirements
The npm package @rundida/mcp-server, run with npx over stdio. Node.js 18 or newer. No API key and no account. The compute tools work without network access; the data tools need to reach rundida.com.
Setup effort
One command — claude mcp add rundida -- npx -y @rundida/mcp-server
USE CASES
01
Working out the pace for a target finish time
Give any two of distance, time and pace and get the third back, computed locally.
02
Predicting a longer race from a shorter one
A known result becomes a projected time, with the formula behind it named.
03
Setting training zones from a resting heart rate
Karvonen zones from age and resting heart rate, rather than a generic percentage table.
04
Counting down to a race
Time remaining to a specific event, alongside its course and weather detail.
05
Finding a guide or calculator on a topic
Browse the library and pull one entry with its FAQs and related tools.
10 tools
Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.
get_guide
Get detailed information about a specific running guide including FAQs and related tools
get_marathon
Get detailed information about a specific marathon including countdown and Schema.org data
get_tool
Get detailed information about a specific running tool including FAQs and related tools
heart_rate_zones
Calculate heart rate training zones using the Karvonen method
list_guides
List all running guides and educational articles on RunDida
list_marathons
List all marathon events tracked by RunDida with dates and locations
list_tools
List all available running calculators and tools on RunDida
marathon_countdown
Get a countdown to a specific marathon event
predict_race
Predict race finish times using the Riegel formula based on a known race result
BEFORE YOU INSTALL
What to know first
Tools you get
10 tools when we connected. calculate_pace, predict_race, heart_rate_zones and marathon_countdown run locally; the six data tools need internet and can be up to 30 minutes stale. No tool saves workouts or registers you for races.
Requires
- npx on PATH
- Node.js >= 18
Where it runs
All 4 documented clients run the server on your machine.
CONTEXT COST
Light Standing cost
Rated by the size of the 10 tool definitions that ride along on every turn, not by how many there are
INSTALLATION
Connect your client
Server setup
Claude Code
TERMINAL
claude mcp add rundida -- npx -y @rundida/mcp-serverMCP Clients
Claude Desktop, Cursor, Windsurf
JSON
{
"mcpServers": {
"rundida": {
"command": "npx",
"args": [
"-y",
"@rundida/mcp-server"
]
}
}
}
