StraightToolsCalculation & Editorial Methodology
How StraightTools builds, checks, and explains its utilities.
Our goal
StraightTools is built to answer practical questions quickly while still showing enough context for you to understand what the result means. A calculator should not be a black box: where a formula or assumption materially affects the answer, we aim to state it on the page.
Calculation sources and conventions
Our tools use established mathematical formulas and published measurement relationships. Examples include standard fixed-payment amortization for loan estimates, 2.54 centimeters per inch, 1.609344 kilometers per mile, and named IANA time zones for city-time calculations. When a convention can vary by context, the page identifies the convention or limitation.
Browser-based processing
Most interactive calculations run in JavaScript in your browser. Text entered into tools such as the word counter and case converter is not intentionally sent to StraightTools for the calculation itself. Hosting and security providers can still process ordinary web-request data as described in our Privacy Policy.
Worked examples
Core tools include examples to make formulas easier to verify. Examples are educational illustrations rather than personalized financial, tax, legal, medical, engineering, or other professional advice.
Review and corrections
We use automated validation to check page metadata, internal links, canonical URLs, and site structure on every deployment. Calculation logic is also reviewed when tools are added or changed. If you find an error, please send the page URL, inputs, observed result, and expected result to contact@straighttools.com.
Important limitations
No general-purpose calculator can model every real-world rule. Taxes, lender fees, public holidays, legal definitions, time-zone legislation, local measurement conventions, and other external rules can change. For decisions with meaningful financial, legal, health, safety, or contractual consequences, verify the result with an authoritative source or qualified professional.