Frequently Asked Questions

Yes. Tally's online calculators are free to use and do not require an account or registration.

Open the calculator you need, enter the requested values in the fields, choose any relevant units or options, and select the calculate button. Read the result and any notes shown on that page.

Yes. The website is designed to work on modern desktop and mobile browsers. For the clearest results, keep your browser updated and check that all required fields are filled in.

Use the units shown beside each field. If a calculator offers a unit selector, choose the unit that matches your value. Mixing units can produce misleading results.

No online calculator should be assumed to be error-free. Results depend on the formula, the assumptions built into the tool, the values you enter, and rounding. Check important results independently before relying on them.

Different tools may use different formulas, assumptions, rounding rules, tax years, regional standards, or measurement conventions. Review the explanation and units on both tools and compare the assumptions before deciding which result applies.

Check that every required field contains a valid number or date, that values are within a sensible range, and that you have not entered zero where the formula requires a non-zero value. Refresh the page and try again if the problem continues.

Some results are rounded for readability. Where precision matters, check the displayed decimal places and the method described on the calculator page. Do not treat a rounded estimate as an exact measurement.

Health and fitness results are informational estimates, not diagnoses or individualized medical advice. Discuss medical concerns or decisions with a qualified healthcare professional.

Use these tools for planning and estimates. Actual rates, fees, lender rules, tax laws, eligibility requirements and individual circumstances can change the outcome. Confirm important figures with the relevant institution or a qualified professional.

Tile, gravel, mulch, roofing and similar estimates depend on the measurements and assumptions entered. Cutting, waste, packaging sizes, site conditions and material density can affect the quantity you actually need. Consider a suitable allowance and confirm measurements before purchasing.

No account is required to use the calculators.

Please visit the Contact page and email us with the calculator's name, the values you entered, the result you expected, and the result you received. Do not include sensitive personal information.

Visit All Calculators to browse the available tools, or use the categories linked in the site footer.