# Calc (calc.engineer)

Browser-based calculators for RF link budgets, LoRa airtime, ZFS capacity and PCB traces, plus a SPICE circuit simulator.

- Atlas card: https://inite.ai/en/atlas/calc.engineer
- Site: https://calc.engineer
- For: Engineers and hobbyists doing RF, LoRa and Meshtastic, homelab networking, solar or PCB design work
- Categories: finance
- Use 0/100 · alive 59/100

## Used for

- Estimate radio link budget and path loss
- Size a dipole antenna for a frequency
- Simulate a SPICE circuit in the browser

## Price

- free (read 2026-10-18 on https://calc.engineer/pricing)

## For developers

- API docs: https://calc.engineer/api
- MCP server: engineer.calc/calc (namespace; open on 2026-10-18, 89 tools)
- Read 2026-10-18

## MCP server, measured daily

Server: https://calc.engineer/mcp, checked every day since 2026-10-19 (2 checks).

- Answered: measuring, 2 daily checks so far
- Median first answer: 995 ms
- Sign-in: none
- Context its tool definitions take: about 30296 tokens (89 tools)
- Tool definitions: B, 83/100
- Failing "annotations": 89 of 89 tools
- Warning "destructive_unmarked": voltage_drop
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-18

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Source: INITE Atlas, https://inite.ai/en/atlas/calc.engineer. JSON: https://inite.ai/api/atlas/calc.engineer. MCP: https://inite.ai/api/mcp (atlas_lookup).