KV Cache Economics50% to 90% Savings
Prompt Caching Cost & ROI Calculator
Calculate estimated cost savings and write amortizations for Anthropic, OpenAI, and DeepSeek prompt caching. Simulate prefix sizes, cache hit ratios, and net monthly returns.
Active Workload Architecture: 250,000 reqs/mo · 35,000 prefix tokens · 85% cache hit rate ·Gemini 3.8 Flash
✓ Cache Active (32,768 min)
Prompt Caching Inputs
KV Cache EconomicsCached Prefix Tokens (System, RAG, Codebase)35,000 tokens
Google cache minimum: 32,768 tokens.
Dynamic User Query Tokens1,200 tokens
Expected Generation Output Tokens600 tokens
Cache Hit Rate (%)85%
Monthly Request Volume250,000 reqs
Google Cache Storage Duration (Hours/Day)1 hrs/day
Google context caching storage fee: $0.50/1M tokens/hour (promotional rate through Dec 31, 2026; 1 hour default retention TTL).Monthly Cash Savings
+$5,019.79
68.3% bill reductionAnnual Projected ROI
+$60,237.45
Net 12-month savingsEconomics Comparison: Uncached vs Cached
Standard Uncached Monthly Cost:$7,350.00
Optimized Prompt Caching Cost:$2,330.21
Google Cache Storage Fee:+$0.5250/mo
Cache Break-Even:(1 reads/day offsets $0.50/1M/hr storage)
0.74 reads/hrProvider Cache Discount:90% Off Prefix
Gemini 3.8 Flash Prompt Caching Details
Read: $0.075/M • Storage: $0.50/1M/hr (No write fee) • Threshold: 32k tok