Resume Length: One Page or Two?

• Student, fresher, or under 3 years of experience: one page. There is not enough material for two without padding, and padding is obvious.
• Three to ten years: one or two pages. Two is fine if the second page is full; a second page with four lines on it looks unfinished.
• Ten or more years, or senior/leadership roles: two pages, comfortably.
• Academic CV, research, or medical: length is driven by publications and is not comparable to a commercial resume.

In this order, because this is the order of diminishing relevance:

1. Roles more than 12-15 years old — collapse them into a single "Earlier Experience" line with titles, companies and years.
2. Coursework, modules and academic detail, once you have three or more professional roles.
3. The skills list, down to the 15-20 most relevant to your target.
4. Bullets 4 and beyond on older roles.
5. Any bullet without a number, starting with the weakest.
6. The setup half of long bullets — keep the action and the result.

Your contact details, your most recent role's bullets, and any certification the posting requires. If space is that tight, reduce margins to 0.5in and line height to 1.15 before you cut content that carries the application.