CalcSmith — Free Money & Health Calculators That Show Their Work

CalcSmith — free money and health calculators that show their workCalcSmith is a free suite of 10 calculators. Every one shows the exact formula it uses, a worked example, charts, a full amortization or projection schedule, CSV export and a shareable link — with no sign-up and no account. Amounts can be shown in nearly thirty currencies, and everything is calculated in your browser, so the figures you type are never sent anywhere.The calculatorsHome Loans

Home Loan Calculator — Repayments, amortization schedule, extra payments & two-loan comparison.

Refinance Break-Even Calculator — When switching costs are repaid — and the honest lifetime math.

Borrowing Power Calculator — How much you could borrow under the 28/36 rule.

Loans & Savings

Loan Repayment Calculator — Personal & car loan repayments, total interest and payoff date.

Compound Interest Calculator — Watch deposits + interest-on-interest grow over time.

Savings Goal Calculator — How long to reach your goal — or what to save each month.

Retirement

Retirement Calculator — Nest egg at retirement, how long it lasts, and the gap fix.

Health

BMI Calculator — Body mass index, healthy range, and what BMI can't tell you.

Calorie / TDEE Calculator — BMR, maintenance calories and goal targets (Mifflin-St Jeor).

Everyday

Percentage Calculator — What is X% of Y, percent change, increase & decrease.

Why the workings are shownMost online calculators hand you a number and hide the maths. CalcSmith prints the formula, the inputs it used and a line-by-line schedule, so you can check the result, take it to a lender or adviser, or reproduce it in a spreadsheet. Where a figure depends on an assumption — an interest rate, an inflation estimate, a drawdown rate — the assumption is stated rather than buried.CalcSmith needs JavaScript to run interactively. It is part of the AppVitamins fleet of free, privacy-first web tools — see also the Smart Budget planner, the spreadsheet templates and the AppVitamins store. Nothing here is financial advice.