About Tool Nectar

How We Build and Verify Our Calculators

Every calculator on this site runs standard, published formulas rather than a proprietary black box — we'd rather you understand the math than just trust it blindly. Each tool's page includes a "How It Works" section that names the actual formula behind the result, so you can check our work or look it up elsewhere if you want a second opinion.

A few examples of the named methods we use: mortgage payments follow the standard amortization formula used across the lending industry; body fat estimates use the published Jackson-Pollock skinfold equations and the Siri body-fat conversion; energy expenditure calculators use the Harris-Benedict and Mifflin-St Jeor equations; fitness estimates like our VO2 max calculator use the Cooper 12-minute run test; statistics tools use standard methods like the Pearson correlation coefficient and least-squares linear regression; and retirement and savings projections use standard compound-interest and future-value math, not a simplified approximation.

When a formula has more than one commonly used variant (quartile calculations are a good example), we say which convention we're using so the result isn't a mystery. If a result ever doesn't match a hand calculation or a reference source, please tell us — we correct reported errors.

We're not a licensed financial advisor, dietitian, or physician, and nothing here replaces professional advice for decisions that matter — every tool that touches health or major financial decisions says so directly on its own page. Our aim is for the math to be the standard, documented version of each formula; always double-check results that matter.

Calculator Guides

If you're working through a bigger decision — buying a first home, planning retirement, or building a fitness routine — using one calculator in isolation only tells part of the story. Our calculator guides walk through the full decision in order, linking each step to the specific tool that helps with it.

Our Policies

Transparency is part of how we operate. Here's where to find the specifics:

• Editorial Policy — how we write, review, and explain our tools.
• Advertising Disclosure — how advertising works on this site.
• Privacy Policy — what data we collect and how we handle it.
• Accessibility — our commitment to making every tool usable.