CalcLeap API — Free Financial Calculator API for Developers

Getting Started

The CalcLeap API provides instant access to financial calculations via simple HTTP requests. All endpoints return JSON and are available over HTTPS.

Base URL

https://calcleap.com

Quick Example

// Fetch mortgage calculation
const response = await fetch('https://calcleap.com/api/mortgage?principal=300000&rate=6.5&years=30');
const data = await response.json();
console.log(data);

# Fetch mortgage calculation
import requests

response = requests.get('https://calcleap.com/api/mortgage', params={
    'principal': 300000,
    'rate': 6.5,
    'years': 30
})
data = response.json()
print(data)

# Fetch mortgage calculation
curl "https://calcleap.com/api/mortgage?principal=300000&rate=6.5&years=30"

Authentication

No authentication required for free tier. All endpoints are publicly accessible with rate limits applied per IP address.

For Pro and Enterprise plans, include your API key in the request header:

Authorization: Bearer YOUR_API_KEY

API Endpoints

GET /api/mortgage

Calculate monthly mortgage payment, total payment, and total interest.

Parameters

principal Loan amount (number, required)

rate Annual interest rate as percentage (number, required)

years Loan term in years (number, required)

Try It

const response = await fetch(
  'https://calcleap.com/api/mortgage?principal=300000&rate=6.5&years=30'
);
const data = await response.json();
// Response: { monthlyPayment: 1896.20, totalPayment: 682632, totalInterest: 382632 }

import requests

response = requests.get('https://calcleap.com/api/mortgage', params={
    'principal': 300000,
    'rate': 6.5,
    'years': 30
})
data = response.json()
# Response: { 'monthlyPayment': 1896.20, 'totalPayment': 682632, 'totalInterest': 382632 }

curl "https://calcleap.com/api/mortgage?principal=300000&rate=6.5&years=30"

GET /api/compound

Calculate compound interest with optional regular contributions.

Parameters

principal Initial investment amount (number, required)

rate Annual interest rate as percentage (number, required)

years Investment period in years (number, required)

contribution Regular contribution amount (number, default: 0)

compounding Compounding frequency: annually, monthly, daily (string, default: annually)

Try It

const params = new URLSearchParams({
  principal: 10000,
  rate: 7,
  years: 10,
  contribution: 500,
  compounding: 'monthly'
});
const response = await fetch(`https://calcleap.com/api/compound?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/compound', params={
    'principal': 10000,
    'rate': 7,
    'years': 10,
    'contribution': 500,
    'compounding': 'monthly'
})

curl "https://calcleap.com/api/compound?principal=10000&rate=7&years=10&contribution=500&compounding=monthly"

GET /api/retirement

Calculate retirement savings projections based on age and contributions.

Parameters

currentAge Current age (number, required)

retireAge Retirement age (number, required)

currentSavings Current retirement savings (number, required)

monthlyContribution Monthly contribution amount (number, required)

annualReturn Expected annual return as percentage (number, required)

Try It

const params = new URLSearchParams({
  currentAge: 35,
  retireAge: 65,
  currentSavings: 50000,
  monthlyContribution: 1000,
  annualReturn: 7
});
const response = await fetch(`https://calcleap.com/api/retirement?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/retirement', params={
    'currentAge': 35,
    'retireAge': 65,
    'currentSavings': 50000,
    'monthlyContribution': 1000,
    'annualReturn': 7
})

curl "https://calcleap.com/api/retirement?currentAge=35&retireAge=65¤tSavings=50000&monthlyContribution=1000&annualReturn=7"

GET /api/loan

Calculate loan payments with optional down payment.

Parameters

amount Loan amount (number, required)

rate Annual interest rate as percentage (number, required)

months Loan term in months (number, required)

downPayment Down payment amount (number, default: 0)

Try It

const params = new URLSearchParams({
  amount: 25000,
  rate: 5.5,
  months: 60,
  downPayment: 5000
});
const response = await fetch(`https://calcleap.com/api/loan?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/loan', params={
    'amount': 25000,
    'rate': 5.5,
    'months': 60,
    'downPayment': 5000
})

curl "https://calcleap.com/api/loan?amount=25000&rate=5.5&months=60&downPayment=5000"

GET /api/insurance

Estimate insurance costs for auto or home insurance.

Parameters

type Insurance type: auto or home (string, required)

state US state abbreviation (string, required)

age Age of insured (number, required)

coverage Coverage amount (number, required)

Try It

const params = new URLSearchParams({
  type: 'auto',
  state: 'CA',
  age: 35,
  coverage: 100000
});
const response = await fetch(`https://calcleap.com/api/insurance?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/insurance', params={
    'type': 'auto',
    'state': 'CA',
    'age': 35,
    'coverage': 100000
})

curl "https://calcleap.com/api/insurance?type=auto&state=CA&age=35&coverage=100000"

GET /api/bmi

Calculate Body Mass Index with category classification.

Parameters

weight Body weight (number, required)

height Height (number, required)

unit Unit system: imperial or metric (string, default: imperial)

Try It

const params = new URLSearchParams({
  weight: 180,
  height: 70,
  unit: 'imperial'
});
const response = await fetch(`https://calcleap.com/api/bmi?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/bmi', params={
    'weight': 180,
    'height': 70,
    'unit': 'imperial'
})

curl "https://calcleap.com/api/bmi?weight=180&height=70&unit=imperial"

GET /api/tip

Calculate tip and split bill among multiple people.

Parameters

bill Bill amount (number, required)

tipPercent Tip percentage (number, required)

people Number of people splitting bill (number, default: 1)

Try It

const params = new URLSearchParams({
  bill: 85.50,
  tipPercent: 20,
  people: 4
});
const response = await fetch(`https://calcleap.com/api/tip?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/tip', params={
    'bill': 85.50,
    'tipPercent': 20,
    'people': 4
})

curl "https://calcleap.com/api/tip?bill=85.50&tipPercent=20&people=4"

GET /api/percentage

Calculate percentage operations: what is X% of Y, percentage increase/decrease, or percentage change.

Parameters

value Base value (number, required)

percentage Percentage value (number, required)

type Calculation type: of, increase, decrease, or change (string, required)

Try It

const params = new URLSearchParams({
  value: 1000,
  percentage: 15,
  type: 'of'
});
const response = await fetch(`https://calcleap.com/api/percentage?${params}`);
const data = await response.json();

response = requests.get('https://calcleap.com/api/percentage', params={
    'value': 1000,
    'percentage': 15,
    'type': 'of'
})

curl "https://calcleap.com/api/percentage?value=1000&percentage=15&type=of"

Pricing

Choose the plan that fits your needs. All plans include access to all endpoints.

Free

$0/month

Perfect for testing and small projects

100 requests per day
All 8 endpoints
Rate limited by IP
Community support
No credit card required

Get Started

Pro

$9/month

For production apps and services

10,000 requests per day
All 8 endpoints
API key authentication
Priority email support
99.9% uptime SLA

Contact Sales

Enterprise

Custom

For high-volume applications

Unlimited requests
Custom endpoints
Dedicated support
SLA guarantees
On-premise deployment option

Contact Sales