Free · No signup · Local computation

Free calculators and converters

Ten tools for everyday calculations: VAT, salary, mortgage, BMI, percentages, units, dates, passwords. Everything runs in your browser — no account, no data sent — with optional Google Translate language selection.

All the tools

VAT CalculatorAdd or remove VAT both ways, exact formula and rounding rules.Gross to Net SalaryNet monthly and yearly, employer cost, adjustable rate.Loan PaymentPayment, total cost, year-by-year amortization.BMI CalculatorBody mass index, WHO interpretation, limits.PercentageShare, change, discount, the asymmetry trap.Unit ConverterLength, mass, area, volume, temperatures.Days Between DatesCalendar, working, business days, weeks.Password GeneratorLocal cryptographic randomness, entropy shown.Compound InterestFinal capital, monthly deposits, the effect of time.Age CalculatorExact years, months, days and days lived.

Why these tools are different

Most calculator sites stack ads before showing a result, or demand an email for a computation that is a single multiplication. Here every page puts the tool first, the formula right below, and an explanation of the edge cases: invoice rounding, the asymmetry of a 10% rise, temperature conversion being non-proportional.

Nothing sent: every computation runs in JavaScript, in your browser.
Explicit formulas: each result comes with the computation behind it, checkable by hand.
No signup: no account, no email, no usage limit.
Stated assumptions: financial simulators say what they exclude — fees, insurance, tax, inflation.

Picking the right tool

For an invoice or a quote, the VAT calculator gives net, VAT and gross both ways. For a salary negotiation, the gross-to-net estimator locates the net monthly and the employer cost. For a property project, the loan calculator exposes the term-versus-cost trade-off. For commercial percentages, the percentage page avoids the classic compensation error.

About the displayed results

Financial and health tools give informational orders of magnitude. They replace neither a payslip, nor a loan offer, nor medical advice. Each page states its assumptions and limits so the result is read correctly.