Disclaimer
Estimates Only
Every calculator and converter on ToolNest produces estimates for guidance only. We build each tool on standard formulas, document the method on the page, and test the maths — but no online calculator can capture every detail of your personal situation. Treat results as a starting point, not a final answer.
Not Professional Advice
Nothing on this site is professional advice of any kind:
Financial and tax: Our finance tools illustrate how calculations work; they are not financial planning, tax, or legal advice. Our salary tax estimator covers federal income tax only — it does not include state or local income taxes, Social Security, Medicare, or payroll deductions, and it uses the standard deduction with simplified assumptions. US tax rules change with new legislation. Before filing or making decisions, verify figures with the IRS, its official publications, or a qualified tax professional or financial advisor.
Retirement and investing: The 401(k) and compound interest calculators show how growth math works under the assumptions you enter; they are not investment advice and cannot predict actual market returns. Contribution limits, employer matching rules and tax treatment change — check current IRS guidance or speak to a qualified advisor.
Medical and health: BMI, BMR and due-date tools are screening aids, not diagnoses. They do not account for your medical history. Consult a doctor for health decisions, especially during pregnancy.
Rates Change
Any tool that uses a market rate — currency exchange, gas prices, sales tax rates — depends on numbers that move constantly. We provide sensible, editable defaults and review them regularly, but the default on the page may not match today's market. For decisions involving real money, always enter the current rate yourself or confirm it with a live source such as your bank, a gas station, or your state's revenue department.
External Links
Where we mention external organisations (such as the IRS), we do so for reference. We are not affiliated with them and cannot vouch for their websites' content.
Your Responsibility
By using our tools you accept that decisions you make based on their output are your own responsibility. If a result looks surprising, check the inputs, read the method section on the page, and verify against an authoritative source. If you believe a tool is showing a wrong result, please tell us — verified errors are fixed promptly.