# RoastyCalc

> Free coffee-to-water ratio calculator for auto drip, pour over, V60, French press, AeroPress and cold brew.

## The calculator

RoastyCalc (https://roastycalc.com/) tells you how much ground coffee to use for a given amount of water, or how much water for a given amount of coffee. Pick a brew method and a strength (mild, balanced or bold). Water can be entered in grams, millilitres, US fluid ounces, US cups (240 ml) or coffee-maker cups (≈148 ml); coffee in grams or tablespoons (1 tbsp ≈ 5 g).

## MCP server

- Endpoint: https://htzlpemzuuqavwtthkwk.supabase.co/functions/v1/mcp
- Transport: streamable HTTP
- Auth: none (public, read-only)
- Version: 0.2.0
- `list_brew_methods` — lists method ids and mild/balanced/bold ratios. Example: "What brew methods and ratios does RoastyCalc support?"
- `calculate_recipe` — computes a recipe from water or coffee amount. Example: "How much coffee for 500 ml of water, French press, balanced?"

## Links

- [RoastyCalc for agents](https://roastycalc.com/agents/)
- [MCP server card](https://roastycalc.com/.well-known/mcp/server-card.json)