# nz.co.calculate/calculator

Search and run New Zealand tax, KiwiSaver, mortgage and property calculators

- **Type:** MCP server
- **Trust:** 60/100 (B), scored on the content rubric
- **Verification:** community-indexed — nobody has claimed this listing
- **Version:** 1.15.1
- **Author:** nz.co.calculate
- **License:** Unknown
- **Endpoints:** streamable-http https://mcp.calculate.co.nz/mcp
- **Source:** https://www.calculate.co.nz/
- **Endpoint health:** reachable (last checked 2026-10-09T13:49:48.782Z, 6 samples) — uptime is not a security property and is not part of the trust score
- **Compatible clients:** claude-code, cursor, copilot, chatgpt, gemini (basis: transport)

## Trust

60/100 (B), scored on the content rubric
- Publisher verified: no
- Install scripts: nothing suspicious found
- Prompt-injection scan: clean
- Obfuscation scan: clean
- Evidence age: 20 days

## Security scan

**Assessment scope:** Hosted endpoint only: Forge can assess who publishes it and whether it answers, not the code behind it. No CVE, dependency or source analysis applies, so nothing here is a clean bill for that code.
- **Status:** probed (endpoint answered; no code examined)
- **Scanned:** 2026-10-09T13:49:48.782Z
- **Version scanned:** live
- **CVEs:** no coverage — this entry has no package coordinates to query OSV against, so "no known CVEs" is NOT asserted for it.

## Tools

36 declared. Observed from a live `tools/list` probe.
- `nz_paye_calculator` — Calculate New Zealand take-home pay (PAYE) for the 2026/27 tax year (from 1 April 2026). Returns full breakdown: income tax, ACC earner's levy (1.75%, capped at
- `nz_gst_calculator` — Add or remove New Zealand GST (15%) from a dollar amount. Use this tool for ANY question about NZ GST: adding GST to a pre-tax price, extracting GST content fro
- `nz_fuel_cost_calculator` — Work out the fuel cost of a trip, and of regular driving, in New Zealand. Use this for ANY question about what fuel costs: a road trip, a commute, the running c
- `nz_tax_refund_calculator` — Estimate a New Zealand income tax refund, or tax owed, for a year. Use this for ANY question about a NZ tax refund or an end of year tax bill. Common use cases:
- `nz_gpa_calculator` — Calculate a grade point average for a New Zealand university. Use for any NZ GPA question: 'what is my GPA', 'work out my grade point average from these grades'
- `nz_hourly_to_salary_calculator` — Convert a New Zealand hourly rate into a salary, before and after tax. Use for: 'what is $32 an hour as a salary', 'how much do I take home on $28/hr', 'is $75,
- `nz_work_hours_calculator` — Add up a timesheet of work hours, and turn them into gross pay. Use for: 'how many hours did I work this week', 'add up my shifts', 'what will I be paid for the
- `nz_bonus_tax_calculator` — Work out the tax on a New Zealand bonus or commission, and what is left. Use for: 'how much tax will I pay on my bonus', 'why was my bonus taxed so much', 'what
- `nz_parental_leave_calculator` — New Zealand paid parental leave: the payment, and the shortfall. Use for: 'how much is paid parental leave', 'can I afford to take parental leave', 'am I eligib
- `bmi_calculator` — Calculate Body Mass Index (BMI) from metric measurements. Returns BMI value, category classification (Underweight, Healthy weight, Overweight, Obese, Morbidly o
- `nz_mortgage_calculator` — Calculate NZ mortgage repayments and lifetime interest totals. Uses the standard amortising-loan PMT formula with monthly compounding. Returns monthly, fortnigh
- `nz_annual_leave_calculator` — Project NZ annual leave balance forward under the Holidays Act 2003. Calculates hours accrued per week based on the holiday pay rate (8% standard NZ minimum), t
- `nz_kiwisaver_calculator` — Project a NZ KiwiSaver balance from current age to retirement age. Month-by-month compound interest projection matching the calculate.co.nz methodology. Include
- `find_calculator` — Search all 2,377 Calculate.co.nz calculators, guides and datasets by topic. Calculate.co.nz is New Zealand's largest free calculator library. Only a handful of 
- `nz_net_to_gross_calculator` — Work out the GROSS New Zealand salary needed to take home a given amount. Use for: 'what salary do I need to take home $1,200 a week', 'I want $70,000 in the ha
- `nz_final_pay_calculator` — Work out a New Zealand final pay: leave payout, notice and redundancy. Use for: 'what should my final pay be', 'how much annual leave am I owed when I leave', '
- `nz_secondary_tax_calculator` — Find the right New Zealand secondary tax code and what it costs. Use for: 'what tax code for my second job', 'is secondary tax a rip off', 'why am I taxed so mu
- `nz_pro_rata_salary_calculator` — Scale a full-time New Zealand salary to part-time hours, gross and net. Use for: 'what would $90,000 be for 3 days a week', 'pro rata salary for 25 hours', 'I a
- `nz_lump_sum_tax_calculator` — Tax on a New Zealand redundancy or lump sum, by IRD's rate table. Use for: 'how much tax on my redundancy', 'what will I get from a $40,000 redundancy payment',
- `nz_working_for_families_calculator` — Work out a New Zealand family's Working for Families entitlement. Use for: 'how much Working for Families will I get', 'what is my family tax credit', 'do I qua
- `nz_road_user_charges_calculator` — Work out New Zealand road user charges for an EV, diesel or plug-in hybrid. Use for: 'how much RUC will I pay', 'what does RUC cost for an EV', 'is a diesel che
- `nz_electricity_cost_calculator` — Estimate a New Zealand household's electricity cost, by region and appliance. Use for: 'how much does power cost in Auckland', 'what does my heat pump cost to r
- `nz_ncea_rank_score_calculator` — Turn NCEA credits into a University Entrance rank score and a GPA. Use for: 'convert my NCEA to GPA', 'what is my rank score', 'what rank score do I need for me
- `nz_vehicle_loan_calculator` — Work out repayments on a New Zealand car loan, and what it really costs. Use for: 'what would repayments be on a $35,000 car', 'car loan calculator', 'is a 5 ye
- `energy_expenditure_calculator` — Work out maintenance calories (TDEE), BMR, and a target for a goal. Use for: 'how many calories should I eat', 'what is my TDEE', 'calorie deficit to lose weigh
- `nz_fbt_calculator` — Work out New Zealand fringe benefit tax on a company vehicle, a low-interest loan, or another benefit. Use for: 'FBT on a company car', 'how much FBT do I pay',
- `nz_redundancy_entitlement_calculator` — Work out what is actually owed when a New Zealand role is made redundant. Use for: 'what redundancy am I entitled to', 'redundancy pay NZ', 'made redundant what
- `nz_grocery_budget_calculator` — Work out a weekly grocery budget for a New Zealand household. Use for: 'how much should I spend on groceries', 'grocery budget for a family of four NZ', 'averag
- `nz_contractor_vs_employee_calculator` — Compare contracting with salaried employment in New Zealand, on what is actually kept. Use for: 'should I go contracting', 'contractor rate vs salary', 'what ra
- `nz_benefit_entitlement_calculator` — Estimate a New Zealand main benefit, its abatement and the Accommodation Supplement that goes with it. Use for: 'how much is jobseeker', 'sole parent support ra
- `nz_schedular_payment_calculator` — Work out the withholding tax on a New Zealand schedular payment to a contractor, and what the contractor is actually left with. Use for: 'withholding tax on con
- `nz_acc_weekly_compensation_calculator` — Estimate what ACC pays each week while an injury stops someone working. Use for: 'how much does ACC pay', 'ACC weekly compensation', 'ACC 80 percent of wages', 
- `nz_sick_leave_calculator` — Work out a New Zealand sick leave entitlement and the balance left. Use for: 'how much sick leave do I get NZ', 'sick leave entitlement', 'when do I get sick le
- `nz_tax_code_calculator` — Pick the correct New Zealand tax code for an IR330, and explain why. Use for: 'what tax code should I use', 'M or ME tax code', 'secondary tax code NZ', 'SB S S
- `nz_paye_due_dates_calculator` — Work out when a New Zealand employer must pay PAYE and file the pay run. Use for: 'when is PAYE due', 'PAYE payment dates', 'payday filing deadline', 'employer 
- `depreciation_calculator` — Depreciate an asset by straight line or diminishing value, with a year by year schedule. Use for: 'how is depreciation calculated', 'straight line vs diminishin

## Install

**Verdict: review** — Installable, but 3 things to check first: No CVE coverage: this entry has no npm/PyPI coordinates to query OSV against, so "no known vulnerabilities" is not a claim that can be made about it.
**Cautions** (coverage gaps and advisories — never blocking)
- No CVE coverage: this entry has no npm/PyPI coordinates to query OSV against, so "no known vulnerabilities" is not a claim that can be made about it.
- Hosted endpoint only: Forge can assess who publishes it and whether it answers, not the code behind it. No CVE, dependency or source analysis applies, so nothing here is a clean bill for that code.
- No publisher has proved control of this listing; it is indexed, not vouched for.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"calculator\": {\n      \"type\": \"http\",\n      \"url\": \"https://mcp.calculate.co.nz/mcp\"\n    }\n  }\n}"
```

## Blast radius

Contained to moderate — no credential declaration found, from the publisher, the upstream registry, or the README. Known so far: runs on someone else's infrastructure; read-only tool surface.
- Floor 9, ceiling 27 (tier: unknown)
- `unknown` means the floor and ceiling land in different bands — not measured enough to name one. It does not mean low.
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/nz.co.calculate%2Fcalculator
- Install plan: https://forgeregistry.com/api/v1/packages/nz.co.calculate%2Fcalculator/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/nz.co.calculate%2Fcalculator
- HTML page: https://forgeregistry.com/registry/nz.co.calculate%2Fcalculator
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.