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Cache Savings Calculator.

Should you enable prompt caching? Input your prompt stats and daily volume. See real savings — not the inflated numbers vendors show.

Your workload

System prompt tokens The repeated prefix (instructions, examples, context)

User message tokens The unique part of each request

Requests per day Daily volume

Expected cache hit rate (%) % of requests sharing the same prefix within TTL

Most calculators overstate caching savings. We use the real formula:

Savings = (input_without_cache × input_price) - (cache_write × cache_write_price) - (cache_read × cache_read_price) - (output × output_price)

Cache writes still cost money. Anthropic charges a premium. OpenAI and Google charge full price. The discount only applies to the cache-read portion.