Price with GST
Add or remove New Zealand GST and identify the tax portion of a total.
New Zealand business tools
Business & Tax Calculators NZ
Use free New Zealand calculators for GST, business borrowing, currency conversion and trade project estimates. Understand the numbers behind pricing, tax, finance and day-to-day business decisions.
- Free to use
- No sign-up
- NZ business context
- Transparent methods
Last reviewed: 5 July 2026
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Direct answer
What are business and tax calculators?
Business and tax calculators turn figures such as prices, GST, loan terms, exchange rates and project measurements into practical estimates. They can help New Zealand businesses prepare quotes, review borrowing costs, convert overseas amounts and estimate materials.
They support planning and checking. They do not prepare a tax return, determine your legal obligations or replace advice from Inland Revenue, an accountant, lender or other qualified professional.
- Clear inputs and results
- NZ GST and business context
- Methods explained on each page
- Related tools linked together
Start here
Featured Business & Tax calculators
Quick access to the main tools for GST, business finance and overseas transactions.
Tax and pricing
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GST Calculator NZ
Add GST, remove GST or find the GST component inside a total.
Business finance
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Loan Calculator NZ
Estimate repayments, total interest and the total cost of borrowing.
International business
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Currency Converter NZ
Convert New Zealand dollars and selected foreign currencies for planning.
Choose by task
What do you need to calculate?
Start with the business task you are working on.
Plan business borrowing
Compare regular repayments, total interest and the overall loan cost.
Convert overseas amounts
Estimate NZD values for international invoices, costs or payments.
Estimate trade materials
Calculate quantities for quotes and early project planning.
Calculator directory
All Business & Tax calculators
Filter the directory by topic or use the search box above.
Filter by topic
GST Calculator NZ
Add GST, remove GST or calculate the GST component of a total.
Loan Calculator NZ
Estimate repayments, total interest and the total borrowing cost.
Currency Converter NZ
Convert New Zealand dollars and selected foreign currencies.
Concrete Bag Calculator NZ
Estimate concrete volume and premix bags for a project quote.
Decking Calculator NZ
Estimate boards, screws, area and material allowance for decking work.
Paint Calculator NZ
Estimate paint litres from surface area, coverage and coat count.
Roofing Calculator NZ
Estimate roof area and materials for early job planning.
No matching calculators were found. Try a broader term such as "GST", "loan", "currency" or "quote".
Business and tax topics
Understand the decision behind the number
Use the tools alongside current official guidance and your own business records.
GST and business pricing
New Zealand GST is generally charged at 15%. A GST calculator can add GST to an exclusive price, remove GST from an inclusive total or identify the GST component for a quote or invoice.
GST registration can become compulsory based on taxable turnover or if you charge GST. Check Inland Revenue before relying on a threshold or deciding whether a supply is taxable, zero-rated or exempt.
Business borrowing and cash flow
A loan calculator shows the effect of the amount borrowed, interest rate, term and payment frequency. Review the total interest as well as the regular payment so the borrowing cost can be considered alongside cash flow.
Actual lender fees, security requirements, floating-rate changes and approval conditions may not be included in a general estimate.
Foreign currency and tax records
Businesses may need to convert overseas income, expenses or invoices into New Zealand dollars. A general converter is useful for planning, but tax records may require a consistent exchange-rate source and method.
Inland Revenue publishes guidance on converting overseas currency for income tax and GST purposes.
Quoting and project estimates
Trade calculators can turn dimensions into estimated quantities for an early quote or material list. A complete business quote may also need labour, travel, equipment, overheads, subcontractors, waste, margin and GST.
Supplier specifications, site measurements and plans should take priority when they differ from a general calculator.
Transparency
Why use NZ Calculator?
The aim is to make each calculation understandable before you price work, review finance or prepare business records.
New Zealand context
Tools use New Zealand dollars, GST terminology and local guidance where relevant.
Transparent formulas
Calculator pages explain the inputs, method, assumptions and important limitations.
Visible review dates
Pages that depend on changing tax rules or data show when the information was reviewed.
No sign-up required
Core calculators can be used without creating an account or supplying business details.
Official New Zealand sources used where relevant
Individual calculator pages identify their specific sources. Common business references include Inland Revenue, Business.govt.nz, ACC and the Companies Office.
How to use the tools
Get a more useful business estimate in three steps
Use current figures
Enter the actual price, rate, loan term, exchange rate or project measurement available to you.
Review what is included
Check whether the estimate includes GST, fees, tax, waste, labour or other business costs.
Confirm obligations
Use official guidance or professional advice before filing tax, signing finance or issuing a final quote.
Common questions
Business & Tax calculator FAQs
Are the business calculators free to use?
Yes. The calculators listed on this page are free to use and do not require an account or sign-up.
What is the GST rate in New Zealand?
New Zealand GST is generally charged at 15% on most goods and services. Some supplies can be zero-rated or exempt, so check Inland Revenue guidance when the treatment is uncertain.
When does a business need to register for GST?
Registration is generally required when taxable turnover was at least $60,000 in the last 12 months, is expected to reach that amount in the next 12 months, or when a business adds GST to its prices. Check Inland Revenue for the rules that apply to your situation.
Can the loan calculator be used for business finance?
Yes, it can provide a general repayment and interest estimate. It may not include establishment fees, security costs, changing rates, tax treatment or lender-specific conditions.
Can I use the currency converter for tax records?
It can help with planning, but tax and GST records may require a particular exchange-rate source or consistent conversion method. Follow Inland Revenue guidance for the transaction involved.
Do trade calculators create a complete quote?
No. They estimate selected material quantities. A complete quote may also need labour, transport, equipment, overheads, subcontractors, waste, profit margin and GST.
Are these calculators tax, accounting or business advice?
No. The results are general estimates for planning and checking. They do not replace advice from Inland Revenue, an accountant, tax adviser, lender or other appropriately qualified professional.
Keep exploring
Related sections
These calculators provide general estimates only. Actual GST treatment, tax obligations, loan costs, exchange rates, project quantities, fees and business outcomes can differ. Review the assumptions on each calculator page and confirm important decisions with Inland Revenue, your accountant, lender, supplier or another appropriately qualified professional.