For AI agents and integrations
Road User Tools API & MCP
Bring Road User Tools road, vehicle and journey calculations into your apps, automations, and AI agents through REST or MCP.
roaduser.tools/api/v1roaduser.tools/mcpRoad tools built to integrate.
Call each capability through a versioned REST endpoint, or let an AI agent discover and use it through MCP.
Convert fuel economy
Convert between UK MPG, US MPG, litres per 100 kilometres, and kilometres per litre.
POST /api/v1/fuel-economy/convertCalculate fuel cost
Calculate fuel required and journey cost from distance, economy, and fuel price.
POST /api/v1/fuel-costConvert tyre pressure
Convert between pounds per square inch, bar, and kilopascals.
POST /api/v1/pressure/convertConvert power
Convert between kilowatts, mechanical horsepower, and metric horsepower (PS).
POST /api/v1/power/convertConvert torque
Convert between newton metres and pound-feet.
POST /api/v1/torque/convertConvert speeds
Convert between kilometres per hour, miles per hour, metres per second, and knots.
POST /api/v1/speed/convertConvert distances
Convert between kilometres, metres, miles, yards, and feet.
POST /api/v1/distance/convertCalculate journey time
Calculate journey duration from distance and average speed.
POST /api/v1/journey-timeWhy use the Road User Tools MCP server?
Give AI agents reliable road tools they can call when they need them. Rather than relying on a language model to calculate fuel costs, unit conversions, journey times, and other road data itself, agents can delegate these tasks to the same purpose-built calculation engine used by Road User Tools.
Through MCP, an agent can discover the available tools, provide structured inputs, and receive consistent results it can use directly in its workflow.
Deterministic calculations
Road and vehicle results come from dedicated calculation functions, not probabilistic model reasoning.
Lower token usage
Replace calculation prompts and intermediate reasoning with compact tool calls and structured results.
Consistency
The same inputs produce the same calculated results, regardless of the model or agent making the request.
Structured outputs
Machine-readable results can be consumed directly or passed into larger agent workflows.
Less model guesswork
Fuel economy, journey costs, unit conversions, and other calculations are delegated to purpose-built tools.
Automatic discovery
New Road User Tools capabilities can become available to MCP clients without requiring a new integration for each tool.
Ready when you are
Build with Road User Tools
Start with the quickstart, then issue a free key from your account when you are ready to make requests.