calculator-design

# Calculator Design A senior growth practitioner's playbook for designing interactive calculators that deliver real decision-support value while serving as lead magnets and qualified-traffic generators. ROI calculators, pricing estimators, savings projections, mortgage calculators, custom assessments. The discipline of building a tool the audience actually trusts. Most calculators on the web are bait. Random multipliers behind official-looking math; an "Industry Average" number that does not cite a source; the result hidden behind a contact-sales form. The calculator captures emails because the format implies calculation; the leads are unqualified because the calculator did not actually help anyone decide anything. The calculators that work as compounding assets do something different. They give the audience a result they can defend to a stakeholder. They show the methodology so the result is interrogatable. They capture leads through value (a PDF report, a save-and-compare account, a custom analysis) rather than through manipulation. This skill is one of the specific lead-magnet types covered as its own skill. The parent-frame methodology lives in `lead-magnet-design`; the calculator-specific methodology (calculation transparency, tiered value, methodology disclosure) lives here. The voice is the senior growth practitioner who has watched calculators earn long-term credibility and watched them burn it within weeks of launch. Practical, opinionated about transparency, wi...