Free Calculators & Conversion Tools

At HelloSafe New Zealand, we understand that managing finances—whether for personal budgeting, business planning, or tracking investments—can sometimes feel overwhelming. That’s why we’ve developed two free, easy-to-use online calculators to help you make quick and accurate calculations, without the hassle of complex formulas or spreadsheets.

Whether you’re a business owner tracking sales, a homebuyer calculating mortgage repayments, or a student checking grade percentages, our tools provide instant results with just a few clicks.

Average Calculator: Instantly Find the Mean Value

Need to calculate an average quickly? Whether you’re analysing exam scores, business profits, or petrol costs, our Average Calculator does the work for you instantly and accurately.

How It Works

Simply enter a set of numbers, and the tool will calculate the mean (average) in seconds. This is useful for:

• Students and teachers calculating grade point averages (GPA).
• Investors tracking stock market returns over time.
• Business owners calculating average sales or expenses over different periods.
• Sports fans analysing player performance statistics.

Tracking Petrol Prices

Let’s say you want to track the average fuel price over five months:

• January: $2.80 per litre
• February: $2.85 per litre
• March: $2.79 per litre
• April: $2.76 per litre
• May: $2.83 per litre

Instead of manually adding and dividing, enter these numbers into our Average Calculator, and you’ll instantly get the result: $2.806 per litre. No need for spreadsheets or complex calculations.

Try our Average Calculator now for quick, hassle-free calculations.

Percentage Calculator: Easily Calculate Increases, Decreases & More

Percentages are everywhere—from sale discounts to tax calculations, mortgage interest rates, and investment returns. Our Percentage Calculator helps you accurately determine percentage increases, decreases, and differences, saving you time and effort.

How It Works

Simply enter the values, and our tool will instantly generate the percentage result. This is useful for:

• Shoppers calculating discounts and final sale prices.
• Homeowners estimating mortgage interest rate changes.
• Business owners measuring profit margins and revenue growth.
• Taxpayers calculating GST (Goods & Services Tax) or PAYE tax contributions.
• Investors tracking percentage gains or losses in stocks or property investments.

Shopping Discounts Made Easy

You’re shopping at Noel Leeming, and a laptop originally priced at $2,000 is 25% off. Instead of manually calculating, enter the:

• Original price: $2,000
• Discount percentage: 25%

Our Percentage Calculator will instantly show:

• You save $500
• The final price is $1,500

Use our Percentage Calculator to save time and money while shopping.

With HelloSafe’s free online calculators, you can quickly and accurately calculate averages and percentages without the stress of manual maths. Whether you’re budgeting, shopping, investing, or studying, our tools make calculations fast and effortless.

Want to take your calculations further? We also guide you on how to create your own tools in Excel.

Try our free online calculators today.

Our guides

• Percentage Calculator: Calculate Percentages Online Instantly
• Average Calculator: How to Calculate an Average?

Emma Walker

Emma is a New Zealand-based writer and editor with a focus on personal finance and everyday money decisions. She holds a Bachelor of Commerce from the University of Auckland and completed postgraduate studies in Financial Literacy and Consumer Behaviour at Victoria University of Wellington. Before joining HelloSafe, Emma worked in publishing and digital media, producing educational content to help Kiwis navigate loans, insurance, saving, and budgeting tools. At HelloSafe, Emma delivers practical, reader-first content tailored to New Zealanders—always with the goal of making financial topics easier to understand and act on.