About SizerHQ

SizerHQ makes free "what size / what does it cost" calculators for home decisions that are usually answered by someone trying to sell you something bigger.

Editorial rules

1. Show the math. Every calculator documents its formula on the page. If you disagree with a result, you can find the line that differs.
2. Cite the sources. Appliance wattages, fuel heat-content and efficiency figures come from DOE, EIA, ENERGY STAR and manufacturer spec sheets — linked where it matters.
3. Never upsell a size. Standard sizing practice (e.g. generator surge counting, Manual-J-style load factors) is applied exactly — not rounded up "to be safe" beyond the engineering consensus, and never because a bigger unit pays more commission.
4. No affiliate links. When we eventually run ads (clearly labeled display ads), they are not allowed to influence a calculator's output. There is no paid placement inside any tool.

Accuracy

Calculators are planning tools. Real houses have quirks no form can capture — a licensed pro is worth their fee for HVAC replacement, standby-generator installation, and anything involving gas or wiring. Our job is to get you into that conversation already knowing the right-size answer, so nobody upsizes you over the phone.

Contact

Found a bug or a bad assumption? [email protected]. Corrections get fixed fast — the math is the product.