About us

Calculate smarter. Grow faster.

Calcio is a free collection of business calculators built for founders, marketers, and growth teams. We turn complex formulas into instant, actionable answers.

Practical tools

Every calculator solves a real business problem. No fluff, just formulas that matter.

Expert guides

Each tool comes with a detailed guide that explains the math, context, and how to act on the results.

Built for everyone

Whether you run a startup, a marketing agency, or a Fortune 500 team — our calculators meet you where you are.

What we offer

AI calculators

Cost and ROI models for OpenAI, Claude, Gemini, and AI agents.

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Startup

Startup calculators

Burn rate, runway, CAC, LTV, and break-even analysis tools.

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Marketing

Marketing calculators

ROAS, CPC, CPM, and conversion rate tools built for growth teams.

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Blog

Expert guides

In-depth articles on metrics, benchmarks, and business strategy.

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Built by Navneet Verma

Navneet is a frontend developer and automation enthusiast who created Calcio to help founders, marketers, and businesses make faster decisions using free calculators. Every tool on this site is designed with real-world use in mind—no fluff, no hidden costs.

Commitment to accuracy

Every formula on Calcio is verified against authoritative sources before publication. We test each calculator with known values, review the displayed formula against standard references, and update calculations when industry standards change. If you find an error, we fix it.

Why choose Calcio

Calcio is free, requires no sign-up, and works on any device. Every calculator shows its formula so you can verify the math. We do not store your data, sell information, or manipulate results. Our tools are maintained regularly and updated when pricing or standards change.

Popular calculators

OpenAI Cost Calculator

Estimate monthly OpenAI API spend from token usage, request volume, and model pricing.

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Claude Cost Calculator

Forecast Claude API spend by combining input tokens, output tokens, and pricing assumptions.

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Gemini Cost Calculator

Plan Gemini API costs for AI apps, search workflows, and multimodal product features.

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AI ROI Calculator

Measure the return on investment from AI tools, agents, and workflow automation.

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AI Agent Savings Calculator

Estimate labor hours and operating costs saved by deploying AI agents.

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startup

Revenue Growth Rate Calculator

Measure how quickly revenue is increasing or declining over time.

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