Tools

Claude API Cost Calculator

Estimate your monthly Claude API spend before you commit. Enter your usage pattern and see daily, monthly, and per-message costs — with and without prompt caching.

Model

Messages / day

API calls your app makes per day

Avg input tokens

System prompt + user message. ~750 tokens ≈ 1 page

Avg output tokens

Claude's response length per message

Prompt caching

Cache your system prompt — pay 90% less on repeated tokens

Token reference

Short tweet~20 tokens

1 paragraph~100 tokens

1 page~750 tokens

Long system prompt~500–2000 tokens

Short answer~100–300 tokens

Full document~2000+ tokens

Estimated cost

$120.00 /month

Per message$0.0040

Per 1,000 messages$4.00

Daily$4.00

Monthly$120.00

Yearly$1,440

Compare across models (same usage)

Claude Fable 5$600.00/mo

Claude Opus 5$300.00/mo

Claude Sonnet 5$120.00/mo

Claude Haiku 4.5$60.00/mo

Estimates only. Prices last verified August 21, 2026 against Anthropic’s official pricing page. Excludes enterprise agreements, the Batch API discount (50% off both directions), long-context or data-residency multipliers, and server-side tool charges such as web search at $10 per 1,000 searches.