5 tools
AI & Emerging Calculators
Forward-looking tools for AI cost planning, energy transition and modern independent work.
AI Token Cost Calculator
Estimate LLM API cost from input/output token counts and per-million-token pricing.AI Context Window Calculator
Estimate how much of a model context window a prompt consumes.Solar ROI Calculator
Estimate simple annual solar savings and payback period.Carbon Footprint Electricity Calculator
Estimate electricity-related CO₂e from usage and an emission factor you provide.Freelance Rate Calculator
Estimate an hourly freelance rate from target income, expenses, billable hours and margin.
Estimate LLM API cost from input/output token counts and per-million-token pricing.AI Context Window Calculator
Estimate how much of a model context window a prompt consumes.Solar ROI Calculator
Estimate simple annual solar savings and payback period.Carbon Footprint Electricity Calculator
Estimate electricity-related CO₂e from usage and an emission factor you provide.Freelance Rate Calculator
Estimate an hourly freelance rate from target income, expenses, billable hours and margin.
About our AI & Emerging tools
Forward-looking tools for AI cost planning, energy transition and modern independent work. Each page puts the calculator near the top, followed by a formula, example, interpretation notes, limitations and links to related tools.
Choose the right calculator
Start with the tool whose title most closely matches the problem you are trying to solve. Keep units and time periods consistent, and check page-specific assumptions before using the result for a decision. When a calculation affects health, money, safety, compliance or engineering work, confirm the output with a qualified source.