Ad & Affiliate Disclosure

We plan to keep our calculators free with advertising and, in some places, affiliate links. Here's exactly how that works.

Advertising

This site may display ads from third-party networks (such as Google AdSense). We don't control which specific ads appear, and showing an ad is not an endorsement. Advertising revenue helps cover hosting and the time it takes to build and maintain the calculators.

Affiliate links

Some pages may include affiliate links to tools and materials we believe are genuinely useful for DIY projects. If you click one and buy, we may earn a commission at no extra cost to you. Affiliate links are marked, and you'll always find this notice linked nearby.

Our promise

• Advertising and affiliate relationships never change the answer a calculator gives you. The math is the math — we don't sell materials, so we have no reason to inflate your order.
• We only plan to recommend products we'd consider using on our own projects.
• Recommendations are kept separate and clearly labelled, never disguised as calculator output.

Questions about how we're funded? Ask us anytime.