A trillion is equal to 1,000 billions. In other words, there are 1,000 billions in one trillion. Key points:

• Short-scale (common in US and modern UK): 1 trillion = 1,000,000,000,000 (10^12) and 1 billion = 1,000,000,000 (10^9).
• Therefore, 1 trillion ÷ 1 billion = 1,000.

If you’re working with long-scale definitions (historical usage in some countries), the relationships differ, but in everyday modern usage you’ll most often use the short-scale conversion: 1 trillion = 1,000 billions.