Will It Fit? How to Calculate VRAM for Local LLMs (GGUF, EXL2) in 2026

Description and use

The VRAM calculator lets developers quickly determine if a chosen LLM will fit on their GPU, avoiding OOM errors.

Problem

Developers need to know if a local LLM will fit in their GPU VRAM before attempting inference, to avoid CUDA OOM errors.

Outcome

The calculator eliminates guesswork, allowing developers to choose compatible models and configurations for their GPUs, reducing trial‑and‑error and preventing OOM crashes.

Workflow

• 1. Open the Local LLM VRAM Calculator on OmniTool Hub. 2. Enter the model size (e.g., 8B, 70B). 3. Select the quantization format (FP16, Q8, Q4, etc.). 4. Specify the target context length (e.g., 8k, 32k). 5. Review the calculated VRAM requirement. 6. Compare the result with your GPU’s available VRAM and adjust parameters if necessary.

Evidence

Stop guessing and getting CUDA Out Of Memory (OOM) errors. We built a 100% client-side Local LLM VRAM Calculator on OmniTool Hub.

Source