calc.engineer MCP MCP server

An official MCP server providing access to 89 free engineering calculators and tools, including RF link budgets, LoRa/Meshtastic simulations, PCB autorouting, and solar calculations, allowing agents to perform precise engineering computations without key requirements.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by calc.engineer

MCP endpoint (Streamable HTTP)

https://calc.engineer/mcp

Vendor documentation

What you can do with it

Calculate RF link budgets for wireless projects
Simulate LoRa and Meshtastic communication ranges
Access PCB autorouting and SPICE simulation tools
Perform solar energy system calculations

Tools advertised by the last live check:

fspl
link_budget
dipole
microstrip
dbm_convert
noise_figure_cascade
vswr
attenuator_pi
attenuator_tee
fresnel_zone
wavelength_freq
spice_template
spice_simulate
lora_airtime
snr_margin
channel_utilization
lora_range_estimate
lora_sensitivity
duty_cycle_budget
meshtastic_range
eirp_compliance
meshtastic_power
lora_param_optimizer
zfs_capacity
zfs_ram
tcp_throughput
wireguard_mtu
subnet_calculator
raid_iops
power_cost
cooling_btu
rack_capacity
network_bandwidth
thermal_enclosure
heatsink_cfd
pcb_thermal
battery_life
wire_gauge
solar_sizing
ups_runtime
mah_to_wh
watts_to_amps
voltage_drop
battery_charge_time
solar_load_audit
solar_roi
battery_autonomy
string_sizing
generator_offset
wire_ampacity
inverter_sizing
pcb_layout
voltage_divider
rc_filter
lc_resonance
impedance_match
trace_width
ohms_law
resistor_color_code
led_resistor
timer_555
op_amp_gain
capacitor_charge
pcb_via_current
power_supply_decoupling
log_calc
sig_figs
scientific_notation
percentage_calc
percentage_increase
exponent_calc
square_root
circumference
slope_calc
pythagorean_theorem
p_value
confidence_interval
sales_tax
salary_to_hourly
loan_amortization
compound_interest
test_grade
square_footage
unit_convert
hex_converter
timestamp_converter
bmi_calculator
tip_calculator
date_difference

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http calc-engineer-mcp https://calc.engineer/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add calc-engineer-mcp --url https://calc.engineer/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable calc-engineer-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "calc-engineer-mcp": {
      "url": "https://calc.engineer/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "calc-engineer-mcp": {
      "type": "streamableHttp",
      "url": "https://calc.engineer/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start calc-engineer-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "calc-engineer-mcp": {
      "type": "http",
      "url": "https://calc.engineer/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http calc-engineer-mcp https://calc.engineer/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "calc-engineer-mcp": {
      "url": "https://calc.engineer/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "calc-engineer-mcp": {
      "serverUrl": "https://calc.engineer/mcp"
    }
  }
}

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