NeuroGenesysFree calculators for AI and neurotech.
Quick answers to the numbers that come up when you build with models or brains: what it costs, how much you need, and which rules apply. Everything runs in your browser, with no sign-up, and what you type stays on your machine. For the decision tools behind our papers, see the research tools.
Model guides
The calculators' answers for each model, precomputed: what it takes to run an open model, and what an API model costs.
- Can I run it? LLM memory by model, GPU and Mac
VRAM needed at 4-, 8- and 16-bit for 24 open-weight models, which GPUs and Macs fit each one, and what runs on 8 GB to 80 GB GPUs and 24 GB to 512 GB Macs.
- LLM API pricing, model by model
Price per 1M tokens, the cost of common workloads and the nearest alternatives for 18 Claude, GPT and Gemini models.
AI cost & evaluation
API spend, GPU memory and speed, training compute, tokens, eval sample sizes, LLM judges, agent tool limits and the EU AI Act.
- LLM API Cost Calculator
Compare what a workload costs per call, per day and per month across Claude, GPT and Gemini models, with prompt caching and long-context pricing.
- Token Counter & Context Window Checker
Paste text or load a file to count its tokens, see what sending it costs as input, and check which models it fits in. Nothing leaves your browser.
- Test-Time Compute Cost Estimator
What Best-of-N and self-consistency cost per query, and the accuracy they can buy: oracle coverage and majority vote against the number of samples.
- AI Eval Sample Size Calculator
How many eval items you need: the margin of error on one model's accuracy, and the sample size to detect a difference between two models, paired or not.
- LLM Training Compute Calculator
Training FLOPs from parameters and tokens (6ND), GPU-hours at a realistic utilization, wall-clock time and cost — or the compute-optimal model for a budget.
- VRAM Calculator: Can I Run This LLM?
GPU memory for an LLM at any quantization and context length — weights, KV cache and overhead — and which GPUs and Apple Silicon Macs can hold it.
- LLM Inference Speed Estimator (Tokens per Second)
Tokens per second and time to first token for a model on a GPU or Mac, from memory bandwidth and compute, and how batching changes throughput.
- Agent Tool Count Calculator
How often an agent picks the wrong tool as its library grows, from published benchmarks: every tool in the prompt, embedding or BM25 shortlists, with the measured range marked.
- LLM Judge Agreement Calculator
Check an LLM-as-judge against human labels: Cohen's kappa with a 95% interval, the confusion matrix, sensitivity and specificity, and how many human labels the judge is worth.
- EU AI Act Risk Checker
Answer a few questions to see your EU AI Act risk tier, the obligations with their articles, and the deadlines after the 2026 Digital Omnibus.
Neurotech & BCI
Neural data rates, BCI information transfer rates, the state laws that cover neural data, and the companies building implants.
- Neural Data Rate Calculator (EEG & BCI)
Raw data rate and storage from channels, sample rate and bit depth, for EEG headsets through intracortical arrays — and whether it fits a wireless link.
- BCI Information Transfer Rate Calculator
Wolpaw ITR for any brain-computer interface: bits per selection and per minute from targets, accuracy and timing, typing-speed equivalents, a chance-level check and published benchmarks.
- Neural Data Privacy Law Checker
Pick the states your users are in and the kind of data you collect to see which neural data laws apply, from when, and what they require.
- BCI Company Comparison
Filter brain-computer interface companies by approach, sort by electrode count and compare any of them side by side on device, results and regulatory status.
