LLM Tool | Calculate LLM inference requirements

Built for production, not demos

GPU type/count, VRAM, CPU & RAM + per-model vLLM flags — production-tested on Hugging Face models across major families

Hugging Face

DeepSeek

Llama

Qwen

Gemma

MoE

Reasoning

Multi-GPU

GPU Requirements

Get exact GPU type & count, VRAM per GPU and total VRAM, plus CPU/RAM — computed for your model and context length

vLLM Parameters

Copy-paste vLLM config with tensor/pipeline parallelism, memory flags, and performance switches — validated to boot first try

Big-Model Ready
70B-600B

Pre-validated configs for multi-GPU, MoE, and reasoning models so your 8×H100/H200 cluster boots first try — no 30–60-minute dead spins or OOM retries

API EXAMPLE

Simple API, powerful results

→Request

curl -X POST "https://llm-tool.p.rapidapi.com/v1/calculate" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "hf_model": "meta-llama/Llama-3.1-8B"
  }'

→Response

{
  "model_family": "llama",
  "estimated_parameters": "8B",
  "gpu_requirements": {
    "recommended_gpu_count": 1,
    "gpu_type": "L40",
    "total_vram_required_gb": 15,
    "memory_per_gpu_gb": 48,
    "cpu_cores": 12,
    "ram_gb": 128
  },
  // ... additional fields available
  "vllm_parameters": {
    "core": {
      "model": "string",
      "tokenizer": "string",
      "reasoning_parser": "string | null",
      "dtype": "string",
      "load_format": "string",
      "quantization": "string | null"
    },
    "parallel": {
      "tensor_parallel_size": "integer",
      "pipeline_parallel_size": "integer"
    },
    "memory": {
      "gpu_memory_utilization": "float",
      "max_model_len": "integer",
      "max_num_seqs": "integer",
      "max_num_batched_tokens": "integer",
      "block_size": "integer",
      "cpu_offload_gb": "integer"
    },
    "performance": {
      "enforce_eager": "boolean",
      "enable_prefix_caching": "boolean",
      "enable_chunked_prefill": "boolean",
      "disable_frontend_multiprocessing": "boolean",
      "disable_custom_all_reduce": "boolean"
    },
    "features": {
      "trust_remote_code": "boolean",
      "multimodal": "boolean",
      "enable_lora": "boolean",
      "max_loras": "integer",
      "max_lora_rank": "integer",
      "max_cpu_loras": "integer",
      "allow_runtime_lora_updating": "boolean",
      "lora_modules": "array | null",
      "chat_template": "string | null"
    }
  },
  "deployment_configuration": {
    "container_disk_gb": "integer",
    "deployment_complexity": "string"
  },
  "model_architecture": "string",
  "is_mixture_of_experts": "boolean",
  "notes": "array[string]",
  "confidence": "string",
  "error": "object | null"
}