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

Each calculator uses industry-standard financial formulas:

Mortgage calculator — Standard amortization formula: M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ−1]. Same math your bank uses.
Loan payoff calculator — Iterative month-by-month simulation, applying interest then deducting payment each period.
Paycheck calculator — Gross salary minus flat effective income tax rate minus FICA (6.2% Social Security + 1.45% Medicare = 7.65%).
Debt snowball calculator — Smallest balance paid first; minimum payments on others; freed payment rolls forward each time a debt is eliminated.
Credit score planner — Weighted FICO factor model (payment history 35%, utilization 30%, length 15%, mix 10%, new credit 10%).
Salary estimator — Directional market-rate estimates based on publicly available BLS Occupational Employment data by title, industry, and region. Not a guarantee of earnings.

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 15 free financial calculators and tools across five categories:

→ Mortgage Payment Calculator → Loan Payoff Calculator → Rent vs. Buy Calculator → Paycheck & Take-Home Pay → Freelance Rate Calculator → 401(k) Withdrawal Calculator → Federal Tax Bracket Calculator → Compound Interest Calculator → Retirement Savings Calculator → Monthly Budget Calculator → Debt Snowball Calculator → Debt Consolidation Calculator → Credit Score Factor Planner → Free Invoice Generator → AdSense RPM Calculator

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.

→ Debt Snowball vs. Debt Avalanche → How Federal Tax Brackets Work → When to Consolidate Debt → How to Improve Your Credit Score → How Much Emergency Fund You Need → Browse all guides →

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.