How to Estimate Your 401(k) at Retirement
Apr 18, 2026
Build realistic projections from current balance, contributions, return assumptions, and timeline.
Open article
NerdCalc Journal
Calculator Guides, Financial Planning Articles, and Health References
In-depth articles that explain calculator formulas, planning concepts, and real-world scenarios with clarity and precision.
Featured Article
APY Calculator — How to Calculate APY, Convert APR to APY, and Project Savings Growth
Learn the APY formula, compare APR vs. APY, and model how compounding changes long-term savings growth.
Read the guidePublished Topics
Finance-heavy explainers with practical formulas, scenario modeling, and decision frameworks, plus our health and transportation references.
How to Use a 401(k) Calculator Before Changing Jobs
Apr 18, 2026
Compare role offers more accurately by modeling salary, match, and long-term retirement impact.
Open articleHow to Use a 401(k) Calculator to Set a Retirement Goal
Apr 18, 2026
Turn vague retirement plans into measurable targets by testing assumptions one variable at a time.
Open articleIRS Standard Mileage Rates: What They Are, How They Work, and Why They Matter for Every Business
Apr 18, 2026
A complete 2026 guide to IRS mileage rates, qualification rules, calculation logic, and practical deduction strategy for businesses and self-employed drivers.
Open articleMedical and Moving Mileage Rates: What Taxpayers Need to Know in 2026
Apr 18, 2026
Understand who qualifies, what records are required, and how medical/moving mileage deductions are calculated.
Open articlePercentage Calculator — How to Calculate Percentages Fast
Apr 18, 2026
Learn the four core percentage formulas, see practical examples, and solve percent-of, reverse-percent, and change problems quickly.
Open articleShould You Increase 401(k) Contributions During Market Volatility?
Apr 18, 2026
A practical guide to contribution consistency and planning behavior during uncertain markets.
Open articleThe Complete Guide to Business Vehicle Tax Deduction Strategies
Apr 18, 2026
A practical strategy guide covering standard mileage, actual expenses, Section 179, and bonus depreciation tradeoffs.
Open articleThe History of IRS Mileage Rates: 2010–2026 Trend Analysis
Apr 18, 2026
Track long-term business, medical/moving, and charity rate trends and what they imply for planning future deductions.
Open articleTraditional vs. Roth 401(k): How to Think About the Difference
Apr 18, 2026
A practical framework for evaluating tax timing tradeoffs without forcing a one-size-fits-all answer.
Open article