AI Inference Latency Calculator
Estimate how long a model takes to generate a response, from tokens per second throughput.
Inputs
Saved Scenarios
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Estimated Time (seconds)
10.00
Spark says
How it's calculated
Formula
- Tokens\ per\ Second
- — The model's generation throughput
What is the AI Inference Latency Calculator?
Response latency for streaming LLM output scales directly with how many tokens need to be generated and how fast the model produces them — this calculator gives a straightforward estimate ignoring queueing/network time.
How to use it
- 1 Enter the expected number of output tokens.
- 2 Enter the model's generation speed in tokens per second.
Worked examples
Limitations
- •Doesn't include time-to-first-token (prompt processing), network latency, or queueing delay under load — only raw generation time.
Frequently asked questions
Why does tokens/sec vary so much between models?
Model size, hardware, batching, and quantization all affect throughput — a smaller or more optimized model can generate tokens far faster than a larger one on the same hardware.