Updated · Methodology: named formula library
API Cost Estimator
Estimate monthly API costs based on usage volume.
At 100 requests/day, your estimated LLM API cost is $31/month.
Why This Calculation Matters
The API Cost Estimator makes AI spend predictable. Usage-based pricing can scale fast, model the math upfront so you're budgeting with reality, not surprise bills.
How to Use This Calculator
- Enter your values in the input fields, each one has a label and help text explaining what to type.
- Results appear instantly as you type; there's no "calculate" button to press.
- Change any input to compare scenarios side by side.
All math happens in your browser. Nothing you type is sent to a server, saved, or shared.
Cost Optimization Tips
- Use cheaper models for simple or bulk tasks, and premium models only when quality matters.
- Implement prompt caching where supported to cut repeat-prefix costs.
- Batch requests when your use case allows.
- Shorten prompts, tokens you don't send are tokens you don't pay for.
How to Use the API Cost Estimator
Enter the required values in the input fields on the left. Results update instantly on the right as you adjust your inputs.
Understanding Your Results
Review each output value and its description to understand how your inputs affect the outcome. Adjust values to compare different scenarios.
Tips
- All calculations happen in your browser, your data is never stored
- Bookmark this page for quick access
- Try different values to see how results change
Formula
Cost per request = (input tokens / 1M × input price) + (output tokens / 1M × output price). Monthly cost = cost per request × requests per day × 30.
Worked Example
1M Claude Sonnet input tokens
- tokens
- 1000000
- rate
- 3
- Result
- $3.00
1M × $3/MTok = $3.00.
When to Use This Calculator
- Budget LLM spend before shipping a feature or deploying at scale.
- Compare providers on a cost-per-request basis instead of sticker price.
- Estimate inference cost for capacity planning and pricing.
Limitations & Common Mistakes
- Provider pricing changes frequently, check the provider's official pricing page for current rates.
- Token counts are estimated from text length; exact counts require the provider's tokenizer.
- Usage-based costs compound with retries, context caching, and multi-turn conversations.
Frequently Asked Questions
How does the API Cost Estimator work?
Enter your input tokens (default: 1000) and any other inputs; the calculator instantly applies its llm api cost formula and shows the result with details. All math runs in your browser; nothing is sent to a server.
Is the API Cost Estimator accurate for api pricing decisions?
It uses standard, documented formulas that match published references. For high-stakes api pricing decisions, verify the result against an authoritative source (industry calculator, professional advisor, or government data). The calculator is a planning estimate, not a substitute for professional judgment.
What inputs does the API Cost Estimator require?
5 inputs: Input Tokens, Output Tokens, Requests Per Day, Input $ / 1M tokens, Output $ / 1M tokens. Each has a sensible default; replace with your own values to get a result tailored to your situation.
Can I bookmark or share the API Cost Estimator?
Yes — the URL is stable: https://www.calcintel.com/calculator/api-cost-estimator. Inputs reset to defaults on each visit (no input is stored), so screenshot or copy the result if you want to preserve a specific scenario.
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Source: BLS Consumer Price Index, 2026.