Disclaimer

The calculators, converters, and tools on Calculator Key are provided for general informational and educational purposes only. Results are estimates and should not be relied upon as the sole basis for any financial, medical, legal, tax, engineering, or other professional decision.

Financial calculators

Mortgage, loan, tax, retirement, and investment results assume idealised conditions and do not account for every fee, credit, or regional rule. Consult a licensed financial advisor before making decisions.

Health calculators

BMI, BMR, body-fat, calorie, macro, pregnancy, and heart-rate results are screening tools, not diagnoses. Consult a qualified medical professional for advice about your personal health.

Accuracy

We take reasonable care to verify formulas and data (e.g. tax brackets), but rates and rules change and errors can occur. Verify anything critical against a primary source.

No warranty

Calculator Key is provided "as is" without warranty of any kind. To the maximum extent permitted by law, we are not liable for any damages arising from use of this site.

Last updated: July 17, 2026