37.5 vs 40 Hour Week in NZ: What It Means for Your Annual Salary
There is no single legal definition of “full-time” in New Zealand — your actual standard week is whatever your employment agreement states, commonly either 37.5 hours (often office/corporate roles, sometimes excluding a paid lunch break) or 40 hours (common in trades, retail, and many other industries). At the same hourly rate, a 40-hour week pays roughly 6.7% more per year than a 37.5-hour week.
Check exactly how this affects your numbers with our free Hourly to Salary Calculator.
Why Two Different “Standard” Weeks Even Exist
New Zealand employment law doesn’t mandate a single standard number of full-time hours — the Employment Relations Act 2000 and Holidays Act simply require that ordinary hours be clearly stated in an employee’s individual employment agreement (IEA) or collective agreement. This leaves real variation in practice:
37.5 vs 40 Hour Week
- 37.5 hours/week is common in many office, corporate, and professional services roles — often structured as 7.5 hours a day, sometimes with an unpaid lunch break not counted in the total
- 40 hours/week is common in trades, retail, hospitality, manufacturing, and many other industries — often 8 hours a day, with paid rest breaks sometimes included in the count
There’s no reliable way to guess which applies to a specific job — the only authoritative source is the actual employment agreement, which should explicitly state ordinary weekly hours.
The Financial Difference, in Real Numbers
At the same hourly rate, the gap compounds meaningfully once converted to an annual figure:
| $22.00 | $42,900 | $45,760 | $2,860 |
| $25.00 | $48,750 | $52,000 | $3,250 |
| $28.00 | $54,600 | $58,240 | $3,640 |
| $30.00 | $58,500 | $62,400 | $3,900 |
| $35.00 | $68,250 | $72,800 | $4,550 |
| $40.00 | $78,000 | $83,200 | $5,200 |
| $45.00 | $87,750 | $93,600 | $5,850 |
| $50.00 | $97,500 | $104,000 | $6,500 |
The pattern: the gap is always exactly 6.67% of the 40-hour figure, since 37.5 hours is precisely 93.75% of 40 hours — but the dollar difference grows substantially at higher hourly rates, from under $3,000/year at entry-level rates to well over $6,000/year at senior professional rates.
Also Read: Net Pay vs Gross Pay NZ: What’s the Real Difference?
The Reverse Problem — Converting a Salary Back to an Hourly Rate
This distinction matters just as much in reverse. If you’re told a role pays “$70,000/year,” your effective hourly rate depends entirely on which standard week applies:
| Standard week | Effective hourly rate on $70,000/year |
|---|---|
| 37.5 hours | $35.90/hour |
| 40 hours | $33.65/hour |
A genuinely common mistake: comparing two job offers by salary alone, without checking each employer’s standard week, can make a lower-hours role look worse on paper when it’s actually a higher effective hourly rate — or vice versa. Always ask specifically what the standard weekly hours are before comparing two salaried offers.
Does This Affect Overtime Calculations Too?
Potentially, yes — if your employment agreement pays overtime for hours worked beyond your standard week, a 37.5-hour standard means overtime-eligible hours start 2.5 hours earlier each week than they would under a 40-hour standard. Someone working a consistent 39-hour week would receive 1.5 hours of overtime under a 37.5-hour standard, but zero overtime under a 40-hour standard, despite working identical actual hours in both cases.
How to Find Out Which Standard Applies to You
- Check your employment agreement — ordinary weekly hours must be stated explicitly; this is the single authoritative source
- Ask during salary negotiation, not after starting — before accepting an offer, ask directly: “what are the standard/ordinary hours for this role?”
- Check your payslip — if it shows an hourly rate alongside a salary figure, you can back-calculate which standard was used
- When comparing job offers, always convert both to the same basis (either both to annual, or both to effective hourly rate) using the actual stated hours for each — never assume both use 40 hours by default
Which Industries Typically Use Which Standard?
| Standard | Common in |
|---|---|
| 37.5 hours | Corporate/office roles, professional services, government/public sector, many tech companies |
| 40 hours | Trades, construction, retail, hospitality, manufacturing, logistics |
This is a general pattern, not a rule — individual employers in any industry can and do set their own standard hours, so this table is a starting expectation, not a guarantee for any specific job.
Frequently Asked Questions
Is full-time 37.5 or 40 hours in New Zealand?
There’s no single legal standard — it depends entirely on what your specific employment agreement states. Both 37.5 and 40 hours are common, varying by industry and individual employer.
How much less does a 37.5-hour week pay than a 40-hour week at the same hourly rate?
Exactly 6.67% less per year, since 37.5 hours is 93.75% of 40 hours. In dollar terms this ranges from roughly $2,860/year at $22/hour to over $6,500/year at $50/hour.
How do I convert my annual salary to an hourly rate if I don’t know my standard week?
Check your employment agreement for the stated ordinary weekly hours first — the same salary produces a meaningfully different effective hourly rate depending on whether it’s based on 37.5 or 40 hours.
Does a 37.5-hour week include lunch breaks?
It varies by employer — some 37.5-hour agreements exclude an unpaid lunch break from the count, while some 40-hour agreements include paid rest breaks. Always check your specific agreement rather than assuming.
Can working a 37.5-hour standard week affect my overtime pay?
Yes, if your agreement pays overtime for hours beyond your standard week. A 37.5-hour standard means overtime-eligible hours begin 2.5 hours earlier each week than under a 40-hour standard.
