Percentage Calculator for Sydney Residents — 2025
Whether you're in central Sydney or the surrounding Greater Sydney area, this tool uses Australian-standard data that applies across the country. Below is Sydney-specific context to help you get the most accurate results for your local situation.
About Sydney, New South Wales
Sydney is located in New South Wales and is part of the Greater Sydney area, with a population of approximately 5.3M. The local economy is supported by diverse industry, professional services and retail. The local property market has a median house price of approximately $1,100,000, with weekly rents averaging $700 for houses.
Cost of Living Context for Sydney
Sydney is one of Australia's most expensive cities, with housing being the dominant cost for most households.
Local Resources for Sydney Residents
- Sydney area council websites for local rates and services
- New South Wales government services at nsw.gov.au
- Australian Government services at australia.gov.au
- ATO for tax and super information at ato.gov.au
Frequently Asked Questions
How do I calculate a 20% discount?
Multiply the original price by 0.80 (the remaining 80% after the discount). $250 × 0.80 = $200 discounted price. Alternatively, find the discount amount: $250 × 0.20 = $50 off. Both methods reach the same result.
How do I calculate percentage change?
Formula: ((New Value − Old Value) ÷ Old Value) × 100. If revenue went from $80,000 to $100,000: ((100,000−80,000)÷80,000)×100 = 25% increase. If it went from $100,000 to $80,000: ((80,000−100,000)÷100,000)×100 = -20% (a 20% decline).
How do I find the original price before a discount?
Divide the discounted price by (1 − discount as decimal). For a 20% discount: divide by 0.80. If the sale price after 20% off is $200: $200 ÷ 0.80 = $250 original price. For removing 10% GST: divide by 1.10.
What percentage markup gives what profit margin?
These are different calculations. A 25% markup (profit ÷ cost = 25%) gives only a 20% margin (profit ÷ revenue = 20%). A 40% markup gives a 28.6% margin. To get a 25% margin, you need a 33.3% markup. Many Australian business owners confuse these, which leads to underpricing.