Free Finance Calculators
Compare mortgage plans, model investments, and calculate percentages instantly — all in your browser, with no financial inputs leaving your device.
💰 Finance Tools 3 tools
Why use MonkeyTactics finance calculators?
Making confident financial decisions requires accurate numbers — and getting those numbers shouldn't require a spreadsheet or a financial advisor for every calculation. MonkeyTactics finance calculators are built to handle the most common personal finance calculations quickly, accurately, and privately.
Whether you're comparing mortgage rates, terms, payment frequencies, and extra payments, projecting how much your savings will grow, or simply figuring out what a 15% discount actually saves you — these tools give you clear answers in seconds. Everything runs directly in your browser, so your financial details never touch a server.
Frequently Asked Questions
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How accurate is the mortgage calculator?
The mortgage calculator uses a local Rust/WebAssembly engine and standard fixed-rate amortization formulas. It models monthly or bi-weekly schedules and optional extra principal payments. Estimates exclude taxes, insurance, escrow, fees, and lender-specific processing, so confirm final figures with your lender.
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Does the compound interest calculator account for taxes?
Yes — the compound interest calculator includes optional fields for tax rate and inflation, allowing you to model real after-tax returns and the true purchasing power of your savings over time.
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Is my financial data stored or shared?
No. Calculations happen entirely in your browser using local JavaScript and WebAssembly engines. No numbers you enter are transmitted to any server, stored in a database, or shared with any third party. See our Privacy Policy for full details.
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Can I use these calculators on mobile?
Yes — all MonkeyTactics tools are fully responsive and work on any device including smartphones and tablets, with no app download required.