Model your AI SaaS margins before your OpenAI bill eats them.

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

LLM Margin is a margin simulator for founders shipping AI products. Enter your pricing, token usage, and MAU — get gross margin, cost-per-user, and breakeven in seconds.

·See your true gross margin % after LLM costs — not the back-of-napkin version your board deck uses.
·Spot power-user risk before one heavy customer wipes out margin on the other 500.
·Find the MAU number where you actually break even at your current pricing.

Used by 1,200+ SaaS founders to pressure-test AI unit economics before raising or repricing.

Trusted by founders shipping AI at

Lumen AIFoundry LabsNorthwindParallaxHelixOutriderQuantaMercer & Co

1,200+

Founders running scenarios

$4.1M

Estimated AI overspend caught

68%

Repriced after their first run

Your SaaS Pricing

Monthly price per user (ARPU) ($)

What you charge per user per month. If you have tiers, use your most common paid tier.

Monthly Active Users (MAU): 1,000

Fixed monthly costs ($)

Hosting, tools, your own salary if applicable. Used for breakeven calculation.

Your AI Usage

LLM Model

AI calls per user per day: 5

How many times does your app call the LLM per active user per day?

Avg input tokens/call

System prompt + user message + history

Avg output tokens/call

Typical AI response length

≈ $0.011500 per call · $1.72 per user/month · $1,725/mo at 1,000 users

Gross Margin

Healthy

83.0%

Software target: 70–80%. AI SaaS avg: 45–60%.

MRR

$19,000

1,000 users × $19.00/mo

AI COGS / month

$1,725

$1.7250/user/mo · OpenAI: GPT-5.5

Breakeven MAU

127

Min paying users needed to cover fixed costs.

Gross Margin vs. Scale

Healthy margins. Your AI costs are under control at current scale.

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.

Founders who got their margin back

Real stories from teams that opened the calculator and changed how they price their AI product.

“Plugged in our actual GPT-4o usage and saw our 'healthy' margin was actually 31%. Switched feature mix to Haiku for the cheap path, kept 4o for the premium tier — back to 68% in a week. This tool paid for itself the day I opened it.”

Maya Okafor

Co-founder & CTO, Lumen AI

“Our board was asking why CAC payback got worse. The power-user table here surfaced it in two minutes — top 8% of users were burning 5x our blended estimate. We capped them and the math came back.”

Daniel Reyes

Founder, Foundry Labs

“I was about to launch at $9/mo. Ran it through the simulator at our projected token usage and realized I'd lose money on every paid user past 2,000 MAU. Repriced to $19 before launch. Saved my runway.”

Priya Shah

Solo founder, Northwind

“Best $19 I spend each month. The PDF export went straight into our Series A deck — investors actually engaged with the unit-economics slide for once.”

Tom Bergmann

CEO, Parallax

LLM Margin is a free LLM margin calculator built for SaaS founders, indie hackers, and AI startup CTOs who need real answers about AI cost per user, gross margin, and breakeven MAU. Instead of spreadsheets and Reddit threads, plug your OpenAI, Anthropic, or open-source LLM pricing into the SaaS margin simulator and get cost-per-user, power-user risk, and monthly burn in one view. If you're pricing an AI product or defending margin to investors, this is the fastest way to stress-test the model.