Real-time cost calculators for every major developer API — from LLMs to cloud infra to payment gateways. Know exactly what you'll pay before you build.
Estimate your monthly spend across GPT-4o, GPT-4, and GPT-3.5 Turbo based on real token pricing.
| Component | Tokens | Cost |
|---|---|---|
| Input | 5M | $12.50 |
| Output | 2M | $20.00 |
| Total Tokens | 7M | — |
Instant cost estimates across 50+ developer tools. Adjust sliders — results update live.
We focus on the APIs with the highest commercial intent — where every calculation counts.
StackMath helps developers, startups and SaaS teams estimate API costs before deployment. Compare OpenAI GPT pricing, AWS Lambda costs, Stripe transaction fees, Twilio SMS pricing, Supabase database expenses and more with real-time interactive calculators.