How does the Roth 401k Calculator work?

Enter your values into the input fields, adjust any parameters, and click Calculate. The tool processes your input instantly and displays accurate results. All calculations happen locally in your browser for privacy and speed.

Is the Roth 401k Calculator free to use?

Yes, this tool is completely free with no signup required. Everything runs locally: Annual Income and Contribution Rate are processed on your device, never sent to a server — your data is never uploaded to any server, ensuring complete privacy and security.

Are the Roth 401k Calculator results accurate?

Yes, the calculator uses standard mathematical formulas and algorithms to ensure accurate results. Calculations are performed using JavaScript's built-in precision. For financial or medical decisions, always verify with a professional.

💰 Roth 401k Calculator

Compare Roth 401k vs Traditional 401k after-tax retirement savings.

📋 Input Parameters

Annual Income (pre-tax)

Contribution Rate

Current Tax Rate

Expected Retirement Tax Rate

Expected Annual Return

Years Until Retirement

Employer Match Rate

Employer Match Cap

% of salary

	Traditional 401k	Roth 401k
Annual Contribution	$0	$0
After-Tax Annual Cost	$0	$0
Total Assets at Retirement	$0	$0
After-Tax Value at Retirement	$0	$0
Which Is Better?	-

💡 Roth vs Traditional

Traditional 401k: Contributions are tax-deductible now, withdrawals are taxed as ordinary income. Best if your current tax rate is higher than retirement rate.
Roth 401k: Contributions are made with after-tax dollars, withdrawals are tax-free. Best if your retirement tax rate will be higher than current rate.
Key Question: Do you think your tax rate will be higher or lower in retirement?

💰 Roth 401k Calculator

📋 Input Parameters

📈 Comparison Results

💡 Roth vs Traditional

🔗 Related Tools