Tools

Calculators and converters that run entirely in your browser. There is no server to send anything to.

Every tool here is built the same way. It shows the arithmetic it used rather than only the answer, it says plainly what it does not account for, and it never invents a number it cannot actually derive from what you typed. Where a figure depends on something the page cannot know, such as your lender’s rate card or your county’s assessor, the tool asks for it instead of guessing on your behalf.

Published

Calculator Compound Interest Calculator What a balance grows to when its interest starts earning interest: the formula, the periodic rate against the effective annual rate, and an honest account of what compound interest does not include. Open the calculator →
Calculator Loan Calculator The amortization engine without the housing-specific parts, for car loans, personal loans, and anything else repaid in level instalments. The payment, where each one goes, and what changing the cadence really does. Open the calculator →
Calculator Mortgage Calculator The monthly payment, the formula that produced it, and the full amortization schedule. Taxes, insurance, mortgage insurance, and association dues are kept visibly separate from principal and interest. Open the calculator →

Planned

These are the next squares on this part of the map. They are listed because the tools above already border on them, not as a roadmap with dates.

Calculator Savings Growth Compound interest with regular contributions, on the annuity formula the compound interest calculator deliberately leaves out. Coming soon
Calculator Refinance Break-Even How many months of a lower payment it takes to recover what the refinance cost to close. Coming soon