Tech & Engineering

AI & Computing Calculators

LLM token cost, GPU memory, training compute, storage and performance. Free calculators with formulas and worked examples.

AI cost

LLM API Cost Calculator (Tokens per Request to Monthly Cost)Enter tokens per request and traffic to estimate your monthly AI API bill.Words to Tokens Calculator (LLM Token Estimate)Convert words or characters to an estimated token count, and see what fits in a context window.AI Energy and CO₂ Calculator (GPU Training or Inference)Enter GPU power and hours to estimate energy, cost and CO₂.GPU Cloud Cost CalculatorEnter GPU prices and usage to compare renting with buying.

Running models

GPU Memory (VRAM) Calculator for LLMsEnter the model size, precision and context to estimate how much VRAM you need.Model File Size Calculator (Quantization)Enter the number of parameters to compare model sizes at different precisions.LLM Tokens per Second Calculator (Memory Bandwidth)Enter memory bandwidth and model size to estimate generation speed.

Training

LLM Training Compute Calculator (FLOPs, GPU Hours, Cost)Enter model size, training tokens and your GPUs to estimate training time and cost.Chinchilla Compute-Optimal Model Size CalculatorEnter a compute budget to get the compute-optimal parameter count and training tokens.Transformer Parameter Count CalculatorEnter the architecture to estimate how many parameters a transformer has.

AI data

Vector Embedding Storage Calculator (Vector Database Size)Enter how many vectors and their dimensions to size a vector database.RAG Chunking Calculator (Chunks, Overlap and Embedding Cost)Enter your corpus size and chunk settings to plan a RAG index.

Number systems

Number Base Converter (Binary, Octal, Decimal, Hex)Type a number in any base to see it in binary, octal, decimal and hexadecimal.Binary to Decimal Converter (and Decimal to Binary)Convert between binary and decimal in either direction.Bitwise Calculator (AND, OR, XOR, NOT)Enter two numbers to see their bitwise AND, OR, XOR and NOT.Two's Complement Calculator (Signed Binary)Convert a signed number to two's complement, or read a bit pattern as signed and unsigned.

Screens and media

PPI Calculator (Pixel Density of a Screen)Enter resolution and diagonal size to get pixels per inch.Video File Size and Bitrate CalculatorEnter bitrate and duration to get the file size, or a target size to get the bitrate.Image File Size Calculator (Uncompressed and Megapixels)Enter the resolution and colour depth to get the image's memory size.

Algorithms

Hash Collision Probability Calculator (Birthday Bound)Enter how many IDs you generate and how many random bits they have to see the collision risk.Amdahl's Law Calculator (Parallel Speedup)Enter the parallel share of the work and the number of processors to see the speedup limit.Algorithm Running Time Calculator (Big O)Pick a complexity and input size to see how long the algorithm would run.

Developer tools

HEX to RGB Converter (and RGB to HEX, HSL)Choose the direction and enter a colour.Color Contrast Checker (WCAG AA and AAA)Enter the text colour and the background colour as HEX codes.

About these calculators

Planning tools for people building with AI and computers: tokens and API cost, GPU memory for models, training and inference compute, throughput, storage and data sizes. Prices change often, so rates are inputs you can edit.

Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.

More in Tech & Engineering

Electronics & EngineeringCloud & NetworkingIP & Domain ToolsRF Wireless 4G & 5GTelecom Power & Passive Infrastructure

Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.