Support 9DC
Power the tools. Fund the prizes.
9DC is free for everyone. Reader support pays for hosting, new calculators, monthly contest prizes, promotion and the writers, engineers and video makers behind the guides.
Where your support goes
⚙
Operations
Hosting, data checks and keeping all nine calculators accurate.
🏆
Contests & prizes
Cash and gear prizes for the monthly DC Build Contest.
✎
Hiring talent
Paying electricians, engineers, writers, developers and video editors.
📣
Promotion & marketing
Reaching more drivers, homeowners and DIY builders.
Monthly memberships
Spark
$3/mo
- Name on the supporters wall
- Supporter-only DC Brief notes
MOST CHOSEN
Current
$9/mo
- Everything in Spark
- Vote on the next calculator
- Early contest themes
Grid
$29/mo
- Everything in Current
- Logo or link on the contest page
- Quarterly Q&A with our editors
Sponsor a prize or a tool
Companies can fund a month's contest prize pool or sponsor a calculator with tasteful, clearly-labelled credit. See sponsorship options →
Make a contribution
We send a secure payment link from a trusted payment provider. We never ask for card numbers in a form. Contributions support an independent publisher and are not tax-deductible.