Summary
Connects Claude to RunDida's 92 running calculators and 46 training guides through their free JSON API. You get ten tools: browse calculators and guides, fetch marathon event details with weather forecasts, and run local computations for pace/time/distance math, race predictions using the Riegel formula, and heart rate zones via the Karvonen method. The compute tools run instantly without API calls. Data tools hit rundida.com with 30 minute caching. Useful when you need running math in conversation, whether that's splitting a 3:30 marathon into per-mile paces or estimating a marathon finish from a 10K time.
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MCP server for RunDida — running expertise for AI agents.
Ten tools that let Claude, Cursor or any MCP client compute paces, heart-rate zones, race predictions and marathon countdowns live, and query RunDida's full library: 99 running calculators, 56 training guides and 300+ marathon events (course, weather and registration data) — in English, Chinese and Japanese. Free, zero-config, no API key.
Quick Start
Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"rundida": {
"command": "npx",
"args": ["-y", "@rundida/mcp-server"]
}
}
}
Claude Code
claude mcp add rundida -- npx -y @rundida/mcp-server
Cursor / Windsurf
Add to your MCP configuration:
{
"rundida": {
"command": "npx",
"args": ["-y", "@rundida/mcp-server"]
}
}
Available Tools
| Tool | Type | Description |
|---|---|---|
list_tools | Data | Browse all 99 running calculators with descriptions |
get_tool | Data | Get details, FAQs, and sources for a specific tool |
list_guides | Data | Browse all 46 running guides with descriptions |
get_guide | Data | Get guide details, FAQs, and related tools |
list_marathons | Data | List 300+ marathon events with dates and locations |
get_marathon | Data | Get marathon details including weather and course profile |
calculate_pace | Compute | Calculate pace, time, or distance (provide any 2 of 3) |
predict_race | Compute | Predict race times using Riegel formula + VO2max estimation |
heart_rate_zones | Compute | Calculate 5 HR training zones (Karvonen method) |
marathon_countdown | Compute | Get countdown to a specific marathon event |
Data tools fetch from the RunDida API with 30-minute caching. Compute tools run locally with zero latency — no API calls needed.
Example Usage
Ask your AI assistant:
- "What's my marathon pace if I want to finish in 3:30?"
- "Predict my marathon time based on my 10K of 45 minutes"
- "What are my heart rate zones? I'm 32 with a resting HR of 52"
- "How many days until the Tokyo Marathon?"
- "Show me all running calculators related to nutrition"
- "What running guides do you have about marathon training?"
- "Tell me about the couch to 5K guide"
About RunDida
RunDida (跑滴答) is a free running tools platform for runners of all levels:
- 90+ Interactive Calculators — Pace, heart rate zones, VO2max, race prediction, nutrition, gear sizing, weather impact, and more
- 29 Marathon Countdowns — Live timers with race-day weather forecasts, course profiles, and training tools
- Free JSON API — No authentication required, CORS enabled, OpenAPI 3.0 documented
- Multi-language — English, Chinese (中文)
- Embeddable Widgets — One-line iframe embed for any calculator
All tools are free, no account required. Try them at rundida.com.
How It Works
The computation tools use established running science formulas:
| Formula | Used In | Description |
|---|---|---|
| Riegel formula | predict_race | Race time prediction across distances |
| Jack Daniels method | predict_race | VO2max estimation from race performance |
| Karvonen method | heart_rate_zones | Heart rate training zones from age and resting HR |
Requirements
- Node.js >= 18
- Internet connection (data tools fetch from rundida.com)
Links
| Resource | URL |
|---|---|
| RunDida Website | rundida.com |
| API Documentation | rundida.com/api |
| OpenAPI Spec | rundida.com/api/openapi.json |
| NPM Package | @rundida/mcp-server |
License
MIT
Featured
Fastest browser for AI agents to run web automation tasks, always free.
Download Free life-time →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Categories
Registryactive
Package@rundida/mcp-server
TransportSTDIO
UpdatedApr 28, 2026
