About LedgerlyTools
Free financial calculators built for clarity — no account, no data collected, no nonsense. Just accurate math for real decisions.
Why we built this
Most personal finance tools are either buried behind a paywall, wrapped in a mortgage lead-gen funnel, or so simplified they're not actually useful. We built LedgerlyTools because we believe accurate financial math should be free and accessible to everyone — not just people who can afford a financial advisor or who are willing to hand over their email address to get a number.
The idea started simply: too many people make major financial decisions — buying a home, paying down debt, withdrawing from retirement accounts — without having access to the actual math. Banks and lenders certainly know the numbers. Most regular people don't. That information asymmetry costs real money.
LedgerlyTools exists to close that gap. Every calculator uses the same formulas that financial professionals use — amortization, progressive tax brackets, FICO scoring models, compound interest — explained in plain English and available to anyone with a browser.
Every calculator on LedgerlyTools runs entirely in your browser. We never see your numbers. Nothing is transmitted to a server, stored in a database, or associated with you in any way. The calculation happens locally on your device and disappears when you close the tab.
Our principles
Accuracy over simplicity
We use the same standard formulas banks use — amortization, FICA, credit utilization math. We show you how the calculation works, not just the output.
Honest about limitations
Every tool carries a clear disclaimer. These are mathematical estimates — not financial, tax, or legal advice. We'd rather under-promise than give you false confidence.
No dark patterns
No email gates, no fake urgency, no "free trial" bait. You can use every tool fully, forever, without creating an account or sharing any information.
Privacy by design
Calculator inputs never leave your browser. We collect anonymous usage analytics (pages visited, device type) to improve the site — nothing linked to you personally.
How our calculations work (Methodology)
Each calculator uses industry-standard financial and actuarial formulas verified against official U.S. regulatory and statistical sources (IRS, Federal Reserve, BLS, and CFPB):
- Mortgage & Loan Payoff Calculators — Standard fixed-rate amortization formula:
M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ−1], plus iterative month-by-month principal curtailment modeling for extra payments.
- Student Loan Payoff Calculator — Month-by-month amortization across Federal Subsidized, Unsubsidized, PLUS, and Private loans with comparative interest and timeline savings from extra principal contributions.
- Rent vs. Buy Calculator — Multi-year net worth comparison factoring in down payment opportunity cost, home appreciation, mortgage amortization, property taxes, maintenance, and closing costs.
- Paycheck & Federal Tax Bracket Calculators — Progressive marginal tax bracket calculation using official IRS statutory brackets and standard deductions, plus FICA payroll taxes (6.2% Social Security up to the annual wage base and 1.45% Medicare).
- Freelance Rate Calculator — Reverse-engineers required billable hourly and day rates from target take-home pay after 15.3% self-employment tax, income taxes, overhead expenses, and realistic billable utilization.
- Compound Interest, Retirement & FIRE Calculators — Time-value-of-money compounding (
FV = P(1+r)ⁿ + PMT × [((1+r)ⁿ − 1) ÷ r]), Safe Withdrawal Rate (4% Rule / Trinity Study) portfolio sizing, and present-value annuity modeling for retirement drawdowns.
- Net Worth & Monthly Budget Calculators — Balance-sheet asset-minus-liability tracking benchmarked against the Federal Reserve Survey of Consumer Finances (SCF) and the 50/30/20 Needs/Wants/Savings framework.
- Debt Snowball & Debt Consolidation Calculators — Multi-debt month-by-month rollover simulation (smallest balance first vs. weighted-average APR consolidation) to determine exact debt-free dates and total interest saved.
- Credit Score Improvement Planner — Weighted diagnostic based on the five public FICO® scoring categories (Payment History 35%, Credit Utilization 30%, Length of Credit History 15%, Credit Mix 10%, New Credit 10%).
- Salary Estimator — Directional market compensation benchmarks derived from U.S. Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics (OEWS) adjusted for experience, industry, and region.
All formulas and their sources are documented in the explainer section of each tool page. If you believe a calculation is incorrect, please let us know — accuracy is our top priority.
Our tools
LedgerlyTools currently offers 18 free financial calculators and tools across five categories:
Personal finance guides
Beyond the calculators, we publish in-depth guides that explain the financial concepts behind the math — written for real people making real decisions, not for finance professionals.
How LedgerlyTools is funded
LedgerlyTools is free to use and supported by display advertising through Google AdSense. Ads are served by Google and are clearly labeled. We do not sell user data, run sponsored calculator results, or accept payment to influence how tools work or what they display. Calculator outputs are purely mathematical — no affiliate relationships affect any number shown.
Have a question, found a bug, or want to suggest a tool? Get in touch.