LLM Rate Limit & Throughput Planner
How many users can you serve within your API rate limits? When will you hit the next tier ceiling? Plan your LLM infrastructure with actual numbers.
Rate Limit Planner
Traffic
Peak TPM needed
200K
Max concurrent users
200
Current tier
Tier 1
Months to ceiling
20.3
OpenAI tier overview
Free 3 RPM · 40K TPM
Tier 1 ← you are here500 RPM · 200K TPM
Tier 2 5,000 RPM · 2,000K TPM
Tier 3 5,000 RPM · 4,000K TPM
Tier 4 10,000 RPM · 10,000K TPM
How to Use
Set peak request volume
Enter your peak requests per minute and average tokens per request. This determines your peak TPM requirement.
Enter user behavior
How many requests does each user make per minute on average? This tells you how many concurrent users your rate limit supports.
Set growth rate
Monthly user growth rate determines when you'll hit the next rate limit tier and need to upgrade or optimize.
Plan ahead
The calculator shows which tier you're on, what the ceiling is, and how many months until you hit it at your growth rate.
Rate limit formula
Max_concurrent_users = min(
RPM_limit / requests_per_user_per_minute,
TPM_limit / tokens_per_user_per_minute
)
Months_to_limit = log(next_tier_TPM / current_peak_TPM)
/ log(1 + monthly_growth_rate)FAQ
Have more questions? Contact us
Last verified: 2026-08-20 · methodology · data sources