Finance Calculators
This hub covers the finance math that comes up around a trade or small business — financing new equipment, comparing a loan's stated rate to what it actually costs, or working out a mortgage payment. None of the calculators below are live yet, but the category is reserved and the first tools are in the build queue.
Coming soon
Mortgage Calculator
Estimate a monthly mortgage payment, and the total interest paid over the life of the loan, from principal, rate, and term.
Loan Interest Rate Calculator
Back-solve a loan's effective interest rate from its principal, payment amount, and term.
What these calculators will cover
Loan and mortgage math both come down to amortization: a fixed periodic payment that covers a shrinking interest charge and a growing principal repayment, in a ratio that shifts every period. Early in a loan's term, most of each payment goes toward interest; late in the term, most of it goes toward principal — the same total payment amount, but a very different split, which is why "how much interest will I actually pay" is a harder question than it looks and rarely matches a quick back-of-envelope guess.
The interest rate itself matters more than the sticker payment amount, but a stated rate and an effective rate aren't always the same number once fees, compounding frequency, and term length are factored in — the coming loan interest rate calculator is built to back-solve the real, comparable rate from the numbers you already know: principal, payment, and term.
In the meantime, the calculators below are live today and cover the rest of the trade and industrial math this site was built for.