The AI budget planner founders use before every board meeting

Name: LLM Margin
Rating: 4.8 (127 reviews)
Author: LLM Margin

Forecast monthly LLM spend across OpenAI, Anthropic, and your infra stack. Set usage caps, model growth scenarios, and know exactly how many months of runway your AI spend is eating.

· Month-by-month AI burn forecast across multiple models and providers in one view.
· Scenario toggles for 2x, 5x, and viral-growth MAU — see which month you blow the budget.
· Alert thresholds so you catch a runaway prompt chain before the invoice lands.

Trusted by founders managing $5K–$500K/month in AI spend across production SaaS.

Total Monthly AI Spend

$4,680

MRR

$15,200

Blended Gross Margin

50.5%

Watch

AI as % of Revenue

30.8%

Watch closely

Step 1: Your User Tiers

Tier Name	Users (MAU)	Price/Month ($)	Paying?

Step 2: Your AI Features

Feature name

Model

Usage per tier

Tier	Calls/day	In tokens	Out tokens
Free
Pro

Total cost: $4,680/mo

Step 3: Fixed Costs

Monthly fixed costs ($)

Stripe fee (%)

Other variable cost/paying user ($)

Cost Breakdown by Feature

AI Chat Assistant

Feature	Model	Free Cost	Pro Cost	Total/Mo
AI Chat Assistant	GPT-5.5	$1,800	$2,880	$4,680
Total		$1,800	$2,880	$4,680

Your Free tier costs $1,800/month but generates $0 in revenue. That's 38% of your total AI spend going to non-paying users. Consider adding a usage cap for free users.

12-Month Cost Projection

Growth/mo:%

Churn/mo:%

AI Cost
MRR

At 15% monthly growth, you'll reach roughly 16,548 MAU in 12 months. Projected AI spend at that point: $13,353/month. Projected MRR: $43,367/month. Gross margin: 50.5%.

Product name

Prices sourced from OpenRouter and updated automatically. Always verify with your provider before making pricing decisions. Estimates do not include volume discounts or enterprise rate cards.

The LLM Margin AI budget planner is built for founders and SaaS operators who need to forecast AI spend with the same rigor as payroll. Model OpenAI API pricing, Anthropic API pricing, and self-hosted inference side by side, set caps per feature, and watch the 12-month burn update live. It's the AI pricing calculator for founders who've already learned the hard way that 'we'll figure out costs later' is how runway disappears.