Welcome to the Retirement Calculator – your go-to tool for comprehensive retirement planning!
Are you ready to embark on the journey of securing your financial future? Planning for retirement can be both exciting and challenging. As someone with a deep passion for personal finance and a desire for a brighter financial future, I've created this tool to help you navigate the complexities of retirement planning.
To use the Retirement Calculator in your project, install it via npm:
npm i retirement-calculator
My journey into retirement planning began with a simple realization: existing tools didn't provide me with the insights I needed. I wanted to know not only how much I should save for retirement but also how to get there. I realized that:
To address these challenges, I started developing the Retirement Calculator package. It's a work in progress, and I have more exciting features in mind, but it's already a powerful tool for your retirement planning needs.
import { RetirementCalculator } from 'retirement-calculator';
const calculator = new RetirementCalculator();
const balance = calculator.getCompoundInterestWithAdditionalContributions(1000, 100, 1, .1, 12, 12);
const calculator = new RetirementCalculator();
const contributionsNeeded = getContributionNeededForDesiredBalance(1000,10000,10,.1,12,12);
// You won't necessarily hit your exact goal, so to find out what the exact total would be, run the following
const balance = calculator.getCompoundInterestWithAdditionalContributions(1000, contributionsNeeded.contributionNeededPerPeriod, 10, .1, 12, 12);
NEW: Age-aware retirement calculations with sophisticated glidepath strategies.
Perfect for modeling target-date funds or declining return assumptions:
const calculator = new RetirementCalculator();
const result = calculator.getCompoundInterestWithGlidepath(
25000, // Starting balance
1000, // Monthly contribution
25, // Starting age
65, // Retirement age
{
mode: 'fixed-return',
startReturn: 0.10, // 10% returns at age 25
endReturn: 0.055 // 5.5% returns at age 65
}
);
console.log(`Final balance: $${calculator.formatNumberWithCommas(result.finalBalance)}`);
console.log(`Effective annual return: ${(result.effectiveAnnualReturn * 100).toFixed(2)}%`);
Model target-date funds with changing equity/bond allocations:
const targetDateResult = calculator.getCompoundInterestWithGlidepath(
50000, 1500, 30, 65,
{
mode: 'allocation-based',
startEquityWeight: 0.90, // 90% stocks at 30
endEquityWeight: 0.30, // 30% stocks at 65
equityReturn: 0.12, // 12% stock returns
bondReturn: 0.04 // 4% bond returns
}
);
Create sophisticated strategies with precise control:
const customResult = calculator.getCompoundInterestWithGlidepath(
15000, 800, 25, 65,
{
mode: 'custom-waypoints',
valueType: 'equityWeight',
waypoints: [
{ age: 25, value: 1.0 }, // 100% equity at 25
{ age: 35, value: 0.85 }, // 85% equity at 35
{ age: 45, value: 0.70 }, // 70% equity at 45
{ age: 55, value: 0.50 }, // 50% equity at 55
{ age: 65, value: 0.25 } // 25% equity at 65
],
equityReturn: 0.11,
bondReturn: 0.035
}
);
// Rich timeline data for visualization
console.log(`Timeline entries: ${customResult.monthlyTimeline.length}`);
customResult.monthlyTimeline.forEach(entry => {
console.log(`Age ${entry.age.toFixed(1)}: ${(entry.currentAnnualReturn * 100).toFixed(2)}% return`);
});
I have created example scenarios that can be found here. These demonstrate both traditional and dynamic glidepath approaches to retirement planning.
Perfect for when you have a specific retirement balance goal (like "$1 million") and want to see if your current savings rate is sufficient. This example shows you how to calculate your "retirement gap" and demonstrates the power of compound interest and why inflation matters for long-term planning.
npx ts-node examples/basic-retirement-gap-analysis.ts
Ideal for people who think in terms of "I want to spend $X per year in retirement" rather than accumulating a lump sum. This example works backwards from your desired lifestyle to required savings and shows how the 4% withdrawal rule works in practice.
npx ts-node examples/lifestyle-based-retirement-planning.ts
For advanced users who want to model changing investment strategies over time (like target-date funds) and compare sophisticated approaches. This comprehensive example demonstrates all glidepath modes with detailed comparisons and educational insights.
npx ts-node examples/advanced-dynamic-investment-strategies.ts
This example showcases:
More scenarios will be added as I continue to enhance the calculator's capabilities.
Your contributions and ideas are essential to making this tool even better. Whether you want to add new features, fix bugs, or introduce innovative concepts, your involvement is greatly appreciated. Let's connect and collaborate on GitHub.
Docs were made with TypeDoc and can be found here.
This project is licensed under the MIT License.
For any inquiries or collaboration ideas, please feel free to reach out through GitHub issues on this repository. You can also connect with me on LinkedIn for professional networking and discussions.
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