---
title: ToolRouter — Agent Use Case Guide
description: Step-by-step guide for completing a task with a specific AI agent using ToolRouter.
url: https://toolrouter.com/tools/nutrition-data/use-cases/calculate-meal-calories/claude
---
# How to Calculate Meal Calories with Claude

Claude handles multi-ingredient meal calculations as a single conversation. List every ingredient with quantities, and Claude looks up each one, aggregates the totals, and walks you through the per-serving breakdown. Follow up to swap ingredients and see how the totals change, making it easy to iterate toward your nutrition targets.

## Setup

claude mcp add toolrouter -- npx -y toolrouter-mcp

## Steps

1. Connect ToolRouter: claude mcp add toolrouter -- npx -y toolrouter-mcp
2. Ask Claude: "Calculate the total calories for this meal: 200g chicken breast, 1 cup brown rice, 1 cup steamed broccoli. Use nutrition-data for each ingredient."
3. Claude looks up each ingredient and calculates the totals
4. Ask: "What are the total macros -- protein, fat, and carbs?"
5. Use the breakdown for your nutrition tracking

## Example Prompt

```
I had a lunch of grilled salmon (150g), quinoa (1 cup cooked), and roasted vegetables (200g mixed). Calculate total calories and macros using nutrition-data.
```

## Tips

- Be specific about quantities and preparation methods for accurate results
- Ask Claude to break down the contribution of each ingredient to the total
- Request the meal as a percentage of daily recommended intake
