About NumSmith

NumSmith exists to answer questions like "what will this mortgage really cost?", "how fast does this grow?" and "exactly how old am I?" — instantly, without pop-ups or sign-up.

What is different

• Your inputs never leave your browser.
• Each calculator shows the year its rates are based on and the working behind the result.
• Available in Korean, English, Spanish, Portuguese, Japanese and German. Korean tax calculators appear only in Korean.

Calculators available today

17 calculators. Rates and holiday calendars are updated yearly.

How it is run

The Service is funded by advertising and every feature stays free. Bug reports and suggestions: [email protected]