LLM API Monthly Budget Calculator: Interactive Graph & Formula

Estimated monthly API cost

$264.00

Input token cost $120.00

Output token cost $144.00

Monthly tokens 78,000,000

Inputs

Display Currency

Rates and amounts use this currency. No foreign-exchange conversion is applied.

Requests per Day requests / day

Average completed requests per day.

Input Tokens per Request tokens / request

Average billed input tokens for one request.

Output Tokens per Request tokens / request

Average billed output tokens for one request.

Input Rate currency / 1M tokens

Provider input token rate in selected currency.

Output Rate currency / 1M tokens

Provider output token rate in selected currency.

Billing Days days / month

Days in the forecast month.

Results & Graph

Estimated monthly API cost

$264.00

Input token cost

$120.00

Output token cost

$144.00

Monthly tokens

78,000,000

Monthly input and output spend

Graph 1 • Monthly token budget Domain-specific illustration generated from the active calculator inputs.

Graph 2 • Cost by token type Components follow the units and rates entered above.

Graph 3 • Monthly cost curve Illustrates how output responds as the workload scales.

Summary: Estimated monthly spend is $264.00.

Summary: 30,000 requests at the entered average token counts estimate to $264.00 over 30 days.

⚠️ Enter rates from the provider pricing page. Pricing tiers, tools, caching, taxes, and model-specific billing rules are not included.

Formula & Mathematical Methodology: LLM API Monthly Budget Calculator

Monthly Cost = Requests/Day \times Days \times (Input Tokens \times Input Rate + Output Tokens \times Output Rate) \div 1,000,000

$R$ : Requests per day
$I,O$ : Average input and output tokens per request
$pᵢ,pₒ$ : Input and output price per million tokens

Rounding: Displayed values are rounded for readability; calculations retain full floating-point precision.

Worked Example: 1,000 daily requests with 2,000 input and 600 output tokens

Use an example rate card of $2/M input and $8/M output for a 30-day month.

Monthly requests = 1,000 × 30 = 30,000.
Input cost = 30,000 × 2,000 × $2 / 1,000,000 = $120.
Output cost = 30,000 × 600 × $8 / 1,000,000 = $144.

Result: Estimated monthly API spend is $264.

Frequently Asked Questions

Where do I get the token rates?

Use your provider’s current pricing page and enter the rate for your selected model and tier.

Developer Tools • AI & LLM Guide

How to Use the LLM API Monthly Budget Calculator: Practical Guide & Visual Analysis

Estimate recurring LLM API spend using your measured token usage and current provider rates. Whether you are researching llm monthly cost, ai api monthly budget, token usage budget calculator, monthly llm spend, this interactive tool helps you forecast monthly LLM API spend from request volume, average input and output tokens, and user-entered rates.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Display Currency, Requests per Day, Input Tokens per Request, Output Tokens per Request, the calculator immediately computes Primary result, Supporting calculation metrics, Three calculator-specific visualizations and updates all three domain-specific SVG charts in real time. Instead of relying on a single static figure, you can inspect the primary domain diagram, component breakdown, and multi-point trajectory curve to see how changing your inputs shifts the final result. Use the Compare (up to 3 scenarios) button to evaluate side-by-side variations before making a decision.

Real-World Benchmark & Planning Tips (Global; user-entered values, assumptions and currency)

In our benchmark scenario (1,000 daily requests with 2,000 input and 600 output tokens), Estimated monthly API spend is $264. Keep in mind that requests and average token counts remain constant through the month. For related calculations in Developer Tools, explore API Token Cost Calculator, AI Model Cost Comparison Calculator, Prompt Caching Savings Calculator.