CalcFuel MCP server

• Addresshttps://calcfuel.com/api/mcpnot in the official registry: answered when asked

No entry in the official MCP registry names this server. It answered on calcfuel.com when the Atlas asked at the address servers are usually mounted on, so it is the vendor's own. Clients and catalogues that list servers from the registry do not show it.

• Stateanswerschecked 2026-10-28
• Tools14
• Server calls itselfcalcfuel-calculators
• Server version1.0.0
• Protocol version2024-11-05

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 135 ms.

• Whether its tools do the product's job has not been judged yet.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP score94 of 100answers 99 · definitions 83 · context 100 · connects 100
• Answered100% of days8 of 8 daily checks
• Median first answer1093 ms
• Space in an agent's context≈ 1,457 tokensthe definitions of all its tools (14), which an agent carries on every turn
• Tool definitionsB · 83 of 100
• Typed results0 of 14 toolsdeclared outputSchema: results come typed, read once

• Not saying whether it only reads or can destroy: 14 of 14

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• marketing_roi

  Calculate Marketing Return on Investment (ROI). Returns ROI percentage and interpretation.

• customer_lifetime_value

  Calculate Customer Lifetime Value (CLV/LTV). Returns the predicted total value a customer will generate.

• click_through_rate

  Calculate Click-Through Rate (CTR) for ads, emails, or other content.

• cost_per_acquisition

  Calculate Cost Per Acquisition (CPA) — how much you spend to acquire one customer.

• cost_per_lead

  Calculate Cost Per Lead (CPL) — how much you spend to generate one lead.

• net_promoter_score

  Calculate Net Promoter Score (NPS) from survey responses. Promoters score 9-10, Detractors score 0-6.

• conversion_rate

  Calculate Conversion Rate — the percentage of visitors who complete a desired action.

• engagement_rate

  Calculate Social Media Engagement Rate — the percentage of followers who interact with content.

• profit_margin

  Calculate Profit Margin — the percentage of revenue that is profit after costs.

• break_even_point

  Calculate Break-Even Point — the number of units you need to sell to cover all costs.

• revenue_per_lead

  Calculate Revenue Per Lead (RPL) — the average revenue generated per lead.

• email_list_growth_rate

  Calculate Email List Growth Rate — how fast your email list is growing.

• character_count

  Count characters in text for social media platforms. Returns character counts and whether text fits each platform's limit.

• email_open_rate

  Calculate Email Open Rate — the percentage of recipients who opened your email.