PureBuild is a collection of free, deterministic calculators designed for startup founders and builders. Our tools help you make data-driven decisions about equity, dilution, runway, unit economics, and more.

Are PureBuild tools really free?

Yes, all PureBuild tools are completely free to use. No sign-up required, no hidden fees, no premium tiers. We believe essential business calculations should be accessible to everyone.

Do I need to create an account?

No. All PureBuild tools work without any sign-up or registration. Your data stays in your browser and is never sent to our servers.

What tools does PureBuild offer?

PureBuild offers 9+ specialized calculators including: Equity Calculator, Dilution Simulator, Runway Calculator, Unit Economics Modeler, Payment Gateway Fee Calculator, API Token Cost Estimator, Database Capacity Planner, Viral Coefficient Calculator, and True Hourly Rate Calculator.

How much does Claude API cost?

Claude Sonnet costs $0.003/$0.015 per 1K tokens (input/output). Claude Opus is $0.015/$0.075. Claude Haiku is the cheapest at $0.00025/$0.00125 per 1K tokens.

What is a token in AI APIs?

A token is roughly 4 characters or 0.75 words in English. 1000 tokens is about 750 words. Both input (your prompt) and output (AI response) consume tokens and are billed separately.

How do I reduce AI API costs?

Use smaller models for simple tasks (GPT-3.5 or Claude Haiku), cache common responses, optimize prompts to be shorter, batch requests, and implement rate limiting.

How much does Claude API cost?

Claude Sonnet costs $0.003/$0.015 per 1K tokens (input/output). Claude Opus is $0.015/$0.075. Claude Haiku is the cheapest at $0.00025/$0.00125 per 1K tokens.

What is a token in AI APIs?

A token is roughly 4 characters or 0.75 words in English. 1000 tokens is about 750 words. Both input (your prompt) and output (AI response) consume tokens and are billed separately.

How do I reduce AI API costs?

Use smaller models for simple tasks (GPT-3.5 or Claude Haiku), cache common responses, optimize prompts to be shorter, batch requests, and implement rate limiting.

AI API Cost Calculator: OpenAI & Claude Token Cost Estimator

PUREBUILD TC-7000

USERS PER DAYINPUT MODE

API Provider

PROGRESS0/2 REQUIRED

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50,000+ calculations

Last updated: 2025-01

Capacity Planner

Project database storage needs

Net Revenue

Calculate revenue after gateway fees

Unit Economics

Calculate LTV:CAC and unit profitability

Learn the Math

→ LLM Cost Structure Explained

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Frequently Asked Questions

GPT-4 costs $0.03 per 1K input tokens and $0.06 per 1K output tokens. For a typical 1000-token conversation, that's about $0.09. GPT-4 Turbo is cheaper at $0.01/$0.03.

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