AI Agent Tools
MCP Calculator Tools for AI Agents
Connect GetCalcly's free calculator API to Claude, Cursor, and any MCP-compatible AI agent. Get accurate mortgage, BMI, salary, and percentage results directly in your AI conversations — no signup, no API key, instant access.
What is Model Context Protocol?
Model Context Protocol (MCP) is an open standard that lets AI agents discover and use external tools. Instead of relying on training data or guessing, an agent can call a real calculator, database, or API to get precise, current results. MCP is supported by Claude, Cursor, and a growing ecosystem of AI tools and agent frameworks.
GetCalcly's MCP server exposes four production-ready calculator tools — the same math engine that powers the getcalcly.com website. Each tool accepts structured inputs (validated with Zod schemas) and returns formatted results with full breakdowns. This makes GetCalcly a practical, zero-friction addition to any AI agent workflow that needs reliable calculations.
Available MCP Tools
Four calculator tools — each with typed inputs, validated schemas, and detailed results.
calculate_loanLoan Calculator
Calculate monthly loan payment with full amortization schedule. Works for auto, personal, and student loans.
Inputs
- loanAmount (USD)
- interestRate (%)
- loanTermYears (1–30)
Use case: Auto loans, personal loans, student loans, installment loans
calculate_deferred_paymentDeferred Payment Calculator
Calculate lump sum due at maturity with compound interest. Configurable compounding frequency.
Inputs
- principal (USD)
- interestRate (%)
- termYears
- compoundFrequency (annually/semiannually/quarterly/monthly)
Use case: Balloon loans, deferred payment loans, compound interest planning
calculate_bondBond Calculator
Calculate zero-coupon bond purchase price, discount, and yield to maturity.
Inputs
- faceValue (USD)
- discountRate (%)
- yearsToMaturity
Use case: Bond pricing, present value, zero-coupon bond valuation
calculate_mortgageMortgage Calculator
Full monthly payment breakdown with principal & interest, property tax, insurance, PMI, HOA, and year-by-year amortization schedule.
Inputs
- homePrice (USD)
- downPayment (USD)
- interestRate (%)
- loanTerm (years, 1–50)
- propertyTax, insurance, HOA, PMI (fixed or %)
Use case: Home affordability, loan comparison, refinance planning
calculate_bmiBMI Calculator
Body Mass Index from weight and height, with the corresponding weight category.
Inputs
- weightPounds (lbs)
- heightFeet
- heightInches (0–11)
Use case: Health screening, fitness tracking, wellness planning
calculate_salarySalary Calculator
Convert hourly wage to weekly, monthly, and annual salary.
Inputs
- hourlyRate (USD)
- hoursPerWeek (default 40)
Use case: Job offer comparison, freelance rate planning, budget estimates
calculate_percentagePercentage Calculator
Calculate what percentage one value is of another.
Inputs
- valueA (part)
- valueB (total)
Use case: Discounts, test scores, growth rates, everyday math
calculate_ageAge Calculator
Calculate exact age from a birth date. Returns years, months, days, total weeks, next birthday, zodiac sign, and birth weekday.
Inputs
- birthDate (YYYY-MM-DD)
- targetDate (optional)
Use case: Age verification, birthday countdown, date math
calculate_caloriesCalorie Calculator
Estimate daily calorie needs using Mifflin-St Jeor. Returns BMR, TDEE, and targets for weight loss, maintenance, and gain.
Inputs
- age
- gender (male/female)
- weightLbs
- heightFeet, heightInches
- activityLevel (sedentary–veryActive)
Use case: Nutrition planning, weight management, fitness goals
How to Connect
Claude Code
Add this to your claude.json or settings.json MCP servers list:
{
"mcpServers": {
"getcalcly": {
"type": "url",
"url": "https://getcalcly.com/api/mcp"
}
}
}Claude.ai
In Claude.ai (desktop or web):
- 1. Go to Settings → MCP Servers
- 2. Click Add Server
- 3. Enter URL:
https://getcalcly.com/api/mcp - 4. The four calculator tools appear instantly
Frequently Asked Questions
What is MCP (Model Context Protocol)?
MCP is an open protocol that lets AI agents like Claude securely connect to external tools and data sources. Instead of the AI guessing a calculation or describing the formula, it can call a real calculator tool and return precise results. GetCalcly provides nine calculator tools through its MCP server — mortgage, BMI, salary, percentage, age, and calorie — so AI agents can deliver accurate, up-to-date computations in any conversation.
How do I connect GetCalcly MCP tools to Claude?
In Claude Code, add getcalcly to your claude.json or settings.json MCP servers list with the URL https://getcalcly.com/api/mcp. In Claude.ai, go to Settings → MCP Servers → Add Server, enter the same URL, and the calculator tools will become available in your conversations. No API key or account is needed.
Is the MCP API free to use?
Yes. The GetCalcly MCP server is completely free — no signup, no API key, no rate limiting beyond basic fair-use thresholds. It runs the same calculation engine that powers the getcalcly.com website, so the results you get through an AI agent match what you would see on the site.
Do I need an API key or authentication?
No. The MCP endpoint at https://getcalcly.com/api/mcp is open and stateless. You can connect any MCP-compatible client directly without authentication. This makes it easy to add calculator tools to your agent workflows, prototypes, and personal projects.
Which AI agents and tools support MCP?
Claude Code, Claude.ai (desktop and web), Cursor, Continue, and a growing number of LLM clients and agent frameworks support MCP. Any client that implements the Model Context Protocol specification can connect to GetCalcly's MCP server and use the four calculator tools.
What data do you collect when I use the MCP API?
The MCP endpoint is stateless — we do not store calculation inputs, results, or session data. Basic request metadata (IP, timestamp) may be logged for operational monitoring, similar to website visits. See our Privacy Policy for full details.
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