Last reviewed May 4, 2026
Editorial Standards
PlanetToolbox tools should make their inputs, formulas, assumptions, and limitations understandable before a user relies on a result.
How Tool Results Are Produced
PlanetToolbox calculators and utilities are built from deterministic formulas, browser-supported APIs, curated data tables, or user-entered inputs. When a tool depends on an assumption that can materially change the result, the page should explain the assumption near the tool or in supporting content.
Most tools do not fetch live rates, prices, medical guidance, legal rules, or tax tables. If a page uses a published source, fixed table, or date-specific rule, it should identify that basis plainly and avoid presenting the result as a live quote or official decision.
Sources And Methodology
We prioritize clear formulas and source notes over broad claims. Useful methodology context can include:
- Finance calculators: interest formulas, compounding periods, amortization approach, rounding behavior, and whether taxes, fees, insurance, or market rates are excluded.
- Tax and payroll estimators: the tax year, filing assumptions, standard deductions, bracket sources, wage bases, and any user-entered state or local rates.
- Health and fitness tools: formula names, population-level limitations, unit conversions, and guidance to consult a qualified clinician for personal decisions.
- Date, time, and calendar tools: time zone basis, countdown rules, holiday rules, and whether future dates come from fixed data or calculated recurrence patterns.
Expanded city time pages use city names, country names, coordinates, population-based ordering, and IANA time zone identifiers derived from GeoNames, which is licensed under the Creative Commons Attribution 4.0 License.
Corrections
To report a possible error, email support@planettoolbox.com with the page URL, the result you expected, the result you saw, and any official or primary source that supports the correction.
We review correction reports for reproducibility and user impact. When a material issue is confirmed, we aim to correct the affected tool, source note, or page copy and avoid overstating the precision of estimates.
Editorial Independence
Advertising, affiliate links, or sponsorships should not control calculator formulas, source selection, correction handling, or tool results. Ads and monetized links should be visually separate from the tool experience.