AI & Tech Calculators
AI token cost, API pricing, SaaS metrics & cloud cost calculators.
What Are AI & Tech Calculators?
AI and tech calculators help developers, founders, product managers, and data teams quantify the costs, performance metrics, and business economics of AI-powered products and technology businesses. As AI inference costs, SaaS unit economics, and cloud infrastructure expenses have become central to product viability, having precise calculators for these metrics is increasingly essential.
AI token and API cost calculators address one of the most practically important questions for teams building on large language models: what does it actually cost to run this feature? LLM providers charge per token β a unit roughly equivalent to three or four characters of text. Costs differ significantly between models (GPT-4o vs GPT-4 mini, Claude Opus vs Claude Haiku, Gemini Pro vs Flash) and between input and output tokens. Our AI token calculator lets you model cost per query, daily cost at a given request volume, and monthly spend for any combination of model and usage pattern.
SaaS metrics calculators cover the key performance indicators that investors and operators use to evaluate subscription businesses. Monthly Recurring Revenue (MRR) and Annual Recurring Revenue (ARR) measure the predictable revenue base. Churn rate measures the percentage of customers or revenue lost each period. Customer Acquisition Cost (CAC) measures what you spend to win each new customer. Customer Lifetime Value (LTV or CLV) estimates the total net revenue a customer will generate over their relationship with your business.
The LTV:CAC ratio is one of the most important health metrics for a SaaS business. A ratio of 3:1 or higher is generally considered healthy β it means each customer generates three times what you spent to acquire them. Below 1:1, the business is destroying value with every new customer. Payback period (CAC Γ· Monthly Net Revenue per Customer) tells you how many months before an acquisition pays for itself.
Cloud and infrastructure cost calculators help engineering and finance teams model the cost of running workloads on AWS, GCP, or Azure. Bandwidth, compute hours, storage, and API call volumes all contribute to the bill. Burn rate and runway calculators show how long a company's current cash reserves will last at the current spending pace β essential for startup financial planning and investor conversations.
Whether you are evaluating whether a generative AI feature is economically viable, benchmarking your SaaS metrics against industry standards, or planning your infrastructure budget for the next quarter, these calculators provide the numerical foundation for data-driven technology decisions.
All AI & Tech Calculators (13)
AI Token Calculator
Calculate token count and cost for AI language model API calls.
OpenAI Cost Calculator
Calculate and compare costs across all OpenAI GPT models for your usage.
Claude Cost Calculator
Calculate monthly API costs for Anthropic Claude models based on your usage.
API Pricing Calculator
Compare and calculate monthly costs across multiple AI and cloud APIs.
SaaS MRR Calculator
Calculate Monthly Recurring Revenue (MRR) including new, expansion, contraction, and churned MRR.
SaaS ARR Calculator
Calculate Annual Recurring Revenue (ARR) from MRR, contracts, and growth metrics.
Startup Runway Calculator
Calculate how many months of runway your startup has based on cash and burn rate.
Burn Rate Calculator
Calculate gross and net burn rate and months of runway for startups.
Cloud Cost Calculator
Estimate and compare monthly cloud infrastructure costs across AWS, GCP, and Azure.
Storage Cost Calculator
Calculate cloud and local storage costs for files, databases, and media.
Internet Speed Calculator
Calculate download/upload time, speed in all units, and data transfer equivalents.
File Size Calculator
Convert file sizes between bytes, KB, MB, GB, TB and calculate storage requirements.
Bandwidth Calculator
Calculate required bandwidth for streaming, video conferencing, and data transfer needs.
AI & Tech Calculator Guides
AI Cost & Token Usage
LLM costs are typically quoted in dollars per million tokens ($/MTok). To estimate the cost of a single API call: Cost = (Input Tokens Γ Input Rate + Output Tokens Γ Output Rate) Γ· 1,000,000. For a feature that sends an average 500 input tokens and receives 300 output tokens, running at 10,000 requests/day on a model priced at $3/MTok input and $15/MTok output: daily cost = 10,000 Γ (500 Γ 3 + 300 Γ 15) Γ· 1,000,000 = 10,000 Γ (0.0015 + 0.0045) = $60/day.
Context window size dramatically affects cost for retrieval-augmented generation (RAG) and chat history use cases. Each message in a conversation thread is re-sent as context with every new message, so a 10-turn conversation with 200 tokens per turn accumulates up to 2,000 input tokens by the final message. Our AI token calculator models this context accumulation effect to give realistic cost projections for conversational features.
SaaS & Subscription Metrics
Core SaaS metric formulas: MRR = Ξ£ (active subscribers Γ monthly plan price); Churn Rate = Lost Customers in Period Γ· Customers at Start of Period Γ 100; LTV = Average Revenue per Account Γ· Churn Rate (simple model); CAC = Total Sales & Marketing Spend Γ· New Customers Acquired; LTV:CAC = LTV Γ· CAC; Payback Period (months) = CAC Γ· Monthly Gross Profit per Customer.
Net Revenue Retention (NRR) measures whether existing customers are expanding, contracting, or churning. NRR above 100% means the existing customer base is growing revenue even without new acquisitions β the hallmark of a truly compounding SaaS business. NRR = (Starting MRR + Expansion MRR β Contraction MRR β Churned MRR) Γ· Starting MRR Γ 100.
Burn Rate & Runway
Gross Burn Rate is total cash spent per month. Net Burn Rate is cash spent minus cash received: Net Burn = Total Expenses β Revenue. Runway (months) = Cash Balance Γ· Net Monthly Burn Rate. A startup with $500,000 in the bank burning $40,000 net per month has 12.5 months of runway. Investors typically expect at least 18 months of runway post-funding to allow time for the next raise.
Conversion rate and CPC/CPM calculators are equally important for growth teams. Conversion Rate = Conversions Γ· Visitors Γ 100. CPA (Cost per Acquisition) = Ad Spend Γ· Conversions. CPM (Cost per Mille) = Ad Spend Γ· Impressions Γ 1,000. These metrics bridge marketing spend and revenue generation, and are essential inputs to CAC calculations.
Top AI & Tech Calculators
AI Token Calculator
Estimate AI API costs per request and monthly spend for any LLM model and usage volume.
Claude Cost Calculator
Model your Claude API spend across Opus, Sonnet, and Haiku models at any request volume.
CAC Calculator
Calculate customer acquisition cost and compare it to LTV to assess growth unit economics.
Churn Rate Calculator
Calculate monthly and annual churn rate and model the impact of churn reduction on LTV.
Burn Rate Calculator
Calculate gross and net monthly burn rate and estimate remaining runway from current cash balance.
Key Formulas & References
AI API Cost
(Input Tokens Γ $/MTok_in + Output Tokens Γ $/MTok_out) Γ· 1,000,000
Per-request cost; multiply by daily volume for daily spend
LTV (simple)
LTV = ARPA Γ· Monthly Churn Rate
ARPA = Average Revenue per Account; churn as a decimal
CAC
CAC = Total Sales & Marketing Spend Γ· New Customers
Use the same time period for spend and customer count
Runway
Runway (months) = Cash Balance Γ· Net Monthly Burn Rate
Net burn = total expenses β revenue received
Frequently Asked Questions About AI & Tech Calculators
A token is the basic unit of text that LLMs process. It roughly corresponds to 3β4 characters or about 0.75 words in English. The sentence "The quick brown fox" is approximately 5 tokens. Token counts vary by language β non-Latin scripts (Chinese, Arabic, Hindi) often use more tokens per word. Most providers offer a tokeniser tool to count exact tokens for any input.
Monthly Cost = Daily Requests Γ (Avg Input Tokens Γ Input Rate + Avg Output Tokens Γ Output Rate) Γ· 1,000,000 Γ 30. Where rates are in dollars per million tokens. Include system prompts (sent with every request) in your average input token count β they are often larger than the user message and are a major cost driver.
A LTV:CAC ratio of 3:1 is the widely cited benchmark for a healthy SaaS business β each customer generates three times the cost to acquire them. Below 1:1 means you are losing money on every customer. Above 5:1 may suggest underinvestment in growth. Payback period (how many months to recover CAC) should typically be under 12β18 months.
MRR (Monthly Recurring Revenue) is the normalised monthly revenue from active subscriptions. ARR (Annual Recurring Revenue) = MRR Γ 12. ARR is the standard metric for annual contract businesses and investor reporting. Both exclude one-time fees, professional services, and variable usage charges unless those are predictable and contractually committed.
Churn rate is the percentage of customers (or revenue) lost in a given period. Monthly churn of 2% compounds to approximately 21% annually β meaning roughly 1 in 5 customers is lost each year. Even small reductions in churn have a large effect on LTV and long-run growth because they extend the average customer lifetime over which revenue compounds.
Net burn rate is the cash a company spends per month minus cash received. Runway = Cash Balance Γ· Net Monthly Burn Rate. It tells you how many months of operation remain at the current spending and revenue trajectory. Most investors advise maintaining at least 18 months of runway to allow adequate time for the next fundraise.
Cloud cost = Ξ£ (resource usage Γ resource unit price). Key components include: compute (instance hours Γ hourly rate), storage (GB stored Γ GB-month rate), egress bandwidth (GB transferred Γ GB rate), and managed service calls (API requests Γ per-request rate). Our cloud cost calculator lets you model these components together for a combined monthly estimate.
BrainyCalculators Editorial Team
Our AI & Tech calculators are researched, built, and reviewed by the BrainyCalculators editorial team using industry-standard formulas and validated against authoritative references. Results are updated whenever underlying standards, rates, or guidelines change. All calculators are free, require no account, and run entirely in your browser.