Best Retirement Calculators for ETF Investors
Last updated: March 2026
Retirement calculators are essential planning tools that answer the most fundamental question in investing: am I saving and investing enough to retire when I want to? By modeling your current savings rate, expected ETF returns, time horizon, and planned spending in retirement, these calculators give you a data-driven projection of your financial future.
For ETF investors specifically, retirement calculators help you understand the power of low-cost investing over long time periods. Even small differences in expense ratios compound dramatically over 20 or 30 years, and the best calculators let you see exactly how much fund fees will cost you in real dollars. This insight alone can save you tens of thousands of dollars over your investing lifetime by motivating you to choose lower-cost ETFs.
The calculators on this list range from simple one-page tools that give you a quick answer to sophisticated Monte Carlo simulators that model thousands of possible market scenarios. We recommend starting with a simple calculator to get a baseline, then graduating to more advanced tools as your comfort with financial planning grows.
Our Top Picks
#1Empower Retirement Planner
FreeThe free retirement planner from Empower (formerly Personal Capital) is one of the most sophisticated tools available at no cost. It links to your actual investment accounts, uses Monte Carlo simulation with thousands of scenarios, and lets you model different retirement ages, spending levels, and life events. Seeing your real portfolio data in the projections makes the results far more meaningful.
#2cFIREsim
FreeA popular tool in the financial independence community, cFIREsim backtests your retirement plan against every historical market period to show your success rate across different scenarios. You can model different withdrawal strategies, Social Security timing, and spending patterns. Completely free and highly configurable.
#3Vanguard Retirement Nest Egg Calculator
FreeA simple and accessible calculator from Vanguard that models how long your retirement savings will last based on your withdrawal rate and asset allocation. While less detailed than some alternatives, its simplicity makes it an excellent starting point for investors who find complex tools intimidating.
#4FICalc
FreeA modern retirement calculator that simulates different withdrawal strategies including the four percent rule, variable percentage withdrawal, and guardrails methods. It tests each strategy against historical market data and shows how your portfolio would have survived in every historical scenario. Clean interface with detailed results.
#5Boldin (formerly NewRetirement)
FreemiumA comprehensive retirement planning platform that goes beyond simple calculators to model your complete financial picture including Social Security optimization, Roth conversion strategies, tax planning, and healthcare costs. The free tier covers basic planning, while the paid tier adds detailed tax optimization and advisor access.
#6Investor.gov Compound Interest Calculator
FreeThe SEC's official compound interest calculator is the simplest tool on this list but also one of the most motivating. Enter your initial investment, monthly contribution, and expected return rate to see how your ETF investments grow over time. Seeing the hockey-stick curve of compound growth is a powerful motivator for staying the course.
How to Choose the Right Option
Start with the Investor.gov compound interest calculator or Vanguard's nest egg calculator to get a quick, simple projection. These tools take less than five minutes to use and give you a reasonable baseline. Once you want more detailed analysis, Empower's retirement planner provides the most value for free by incorporating your actual portfolio data. For investors focused on financial independence or early retirement, cFIREsim and FICalc offer the specialized analysis you need, including historical backtesting and alternative withdrawal strategies. If you want the most thorough retirement plan possible, Boldin covers virtually every aspect of retirement planning including tax optimization and Social Security timing. The key is to run your numbers at least once a year and adjust your savings rate or target date based on the results.
Recommended: This beginner-friendly ETF course on Udemy covers everything from ETF fundamentals to building a recession-proof portfolio in 7 days.
Explore More Resources
Building your ETF investing knowledge requires multiple types of resources. Explore our other curated resource guides to find the tools, communities, and learning materials that fit your investing style.