Australia Post charges based on both weight and size, determining the "chargeable weight" as the greater of the item's actual weight or its cubic weight (volume-based weight), with specific flat-rate options (satchels/boxes) using fixed size categories for items up to 5kg. Using your own packaging or sending over 5kg generally involves weight/cubic weight calculations to your destination, while branded flat-rate packaging offers size-based pricing.
Parcel Post parcels (up to 5kg) National flat rates for postage for items up to 5kg anywhere within Australia. If using Australia Post eligible packaging – postage is based on four size categories. If using other packaging – postage is based on the item weight or cubic weight, in four weight categories.
Shape, weight, and size affect the price for large packages. If you have a large, lightweight package, instead of paying the normal postage price, you may be charged the balloon price, oversized price, or dimensional weight price depending on the class of mail and additional factors.
If you send 5kg or under in Australia using flat rate packaging, your postage is calculated based on the packaging size. There are five sizes to choose from - extra small, small, medium, large or extra large.
Australia Post charges per kilo for parcels over 5kg, with prices varying significantly by destination zone (e.g., Sydney, Perth, regional QLD) and weight increments (e.g., 5-10kg, 10-15kg), using the greater of actual or cubic weight; for smaller parcels (up to 5kg), fixed rates apply to specific flat-rate sizes (XS-XL) or weight bands, starting around $9.70 for small items.
Here's a sample India Post parcel rate per kg (Speed Post domestic): Up to 50 g: ₹15 local / ₹35 for long distance. 51–200 g: ₹25 local / ₹35–₹70 depending on zone. 201–500 g: ₹30 local / ₹50–₹90 depending on distance.
For the cheapest parcel delivery in Australia, compare rates using platforms like Couriers & Freight or Transdirect to find the best deal, as services like Sendle, Aeros Couriers, and even standard Australia Post (for lighter items) compete on price, with Off-Peak or Standard options often being cheapest when speed isn't crucial. Your best bet depends on parcel size and urgency, but booking through comparison sites unlocks significant discounts.
Using Royal Mail
Royal Mail divides its price bands by Letter, Large Letter, Small Parcel, Medium Parcel, Large Parcel, and Tubes which are priced in proportion to the dimensions and weight of packages—the smaller your parcel, the less you'll pay to send it.
For shipments traveling shorter distances, Zones 1-4, and weighing less than 20 lbs, using your own packaging for weight-based rates may be a better value. Across all zones, though, shipments weighing over 25 lbs will ship for less in a Flat Rate Large Box.
Australia Post calculates postage primarily by chargeable weight, which is the greater of the parcel's actual weight or its cubic weight (volume x 250 conversion factor). Costs also depend on the destination (origin/destination postcodes), the chosen service level (e.g., Parcel Post, Express), and any extra features like signature or insurance, with flat-rate options available for specific prepaid satchels up to 5kg.
Small parcel postage sizes. These are the maximum postage sizes we use for small parcels: Max weight: 2kg.
The size and weight of your letter or parcel will determine the postage amount you need to pay.
Some of the most common reasons for adjustments include entering incorrect dimensions and weight as well as using/entering the incorrect packaging. As a reminder, the maximum weight for Priority Mail Flat Rate® Boxes (all sizes) is 70 pounds. Additionally, weight is rounded up.
Yes, you can absolutely use your own packaging for Australia Post, but postage costs are calculated differently than with their flat-rate satchels, based on your item's actual weight or cubic weight (whichever is greater) and destination, so you must accurately measure and weigh your package for accurate pricing. Ensure your packaging is sturdy, matte, and light-colored for easy machine sorting, and avoid shiny, dark, or excessively taped materials to prevent sorting issues and potential voided compensation claims.
Sending a 1kg parcel in Australia generally costs between $15 to $20 AUD for standard service via Australia Post, with express options costing slightly more, but prices vary by provider, speed, and if you use flat-rate satchels or your own packaging, with services like Sendle offering potentially lower rates. For example, Australia Post's Parcel Post (500g-1kg) is around $15.25, while Express Post is about $19.25, but private couriers like Sendle can offer cheaper deals for 1kg, around $8.51 depending on location.
For First-Class Mail, shape and weight will determine the price. For Priority Mail, the price is a combination of weight, size, and how far the mailpiece is traveling. Priority Mail pieces that exceed one cubic foot, are subject to "dimensional weight pricing".
Cheapest way to ship small packages: USPS, UPS, FedEx, DHL comparison. If you're shipping a small package in the US, the cheapest option is usually USPS Ground Advantage or Priority Mail bought online. For heavier boxes (20 lb+), UPS or FedEx Ground often win on price with discounted labels.
Australia Post is generally cheaper for domestic shipping and lightweight international parcels, while DHL often becomes more competitive or cheaper for heavier international shipments or when speed and premium tracking are essential, though its standard rates are usually higher. The best choice depends on your specific needs: Australia Post for budget domestic/small items, DHL for fast international express or heavy freight.
Australia Post's maximum parcel size for domestic and most international parcels is 105cm for the longest side, with a maximum weight of 22kg domestically (20kg international) and a maximum volume of 0.25 cubic metres, but specific Parcel Locker limits (35x44x61cm, 16kg) are smaller. Charges are based on physical or cubic weight (L x W x H x 250), so large, light items cost more.