AI & Prompt Tools · Free tool
Prompt Cache Savings Calculator
Calculate your monthly savings from prompt caching across Anthropic, OpenAI, and Gemini. 90% off cached input tokens — usually pays back instantly.
Updated June 2026
Without cache
$6,091.2/mo
With cache
$6,540.48/mo
Savings
$-449.28
-7% off
How it works: Anthropic, OpenAI, and Google all let you cache stable prompt prefixes (system messages, RAG context, few-shot examples). Cached reads cost ~10% of normal input tokens. Cache TTL: Claude 5 min default (configurable), OpenAI/Gemini 1 hour. The fix: keep your stable prefix at the START of every call.
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What it does
Anthropic, OpenAI, and Google all let you cache stable prompt prefixes — system messages, RAG context, few-shot examples. Cached reads cost roughly 10% of normal input tokens. This calculator estimates your monthly savings given your call rate and prompt structure. The fix is almost always “keep your stable prefix at the start of every call.”
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/prompt-cache-savings-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Prompt Cache Savings Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Pick provider.
- Enter system / user / output token sizes.
- Enter calls per hour.
- Read savings.
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