Short answer: Buy a single pair if you train for mobility, rehab or Pilates, or if you already know the one weight you use every session. Buy two or more pairs if you want to train legs and upper body from the same set, because the weight you can squat is roughly double the weight you can press overhead.
The short answer
The delivered price pushes the same way. A light single pair usually sits under $75, so the $9.95 flat rate applies, while almost any two pairs clear $75 and ship free to Australia and New Zealand. A 2kg pair and a 5kg pair ordered together is $78 delivered. Ordered separately in two goes, the same two pairs cost $97.90 delivered.
Free delivery on orders over $75 to Australia and New Zealand. Orders under $75 pay a $9.95 flat rate. Dispatch is 1-2 business days and a tracking number is emailed once your order ships.
When a single pair is genuinely enough
One pair is the right buy more often than set marketing suggests. If the pair matches the work you actually do each week, a second pair sits in a cupboard for a year.
- Pilates and mat work: a 2kg pair at $29 or a 3kg pair at $35 is the working weight for most mat sequences, and anything heavier gets skipped.
- Rehab and shoulder loading: external rotations, scapular work and early rotator cuff loading all sit between the 0.5kg pair at $19 and the 2kg pair at $29.
- High rep circuits: if your sessions are 20 minutes of continuous circuits, one 5kg pair at $49 carries every movement in them.
- Loading bodyweight training: a single 10kg pair at $79 turns bodyweight squats, lunges and step ups into loaded work, and at $79 it ships free on its own.
In all four cases the deciding question is whether your hardest lift and your easiest lift want the same weight. If they do, one pair is the whole answer and a set is money sitting on the floor.
Where a single pair stalls you
A single pair stops working when one muscle group outgrows it while another has not caught up. The usual shape is squats and Romanian deadlifts running past 20 reps while overhead presses are still hard at 8 reps, with the same pair on the floor for both.
The rep spread that tells you
- Over 15 reps on squats or hinges: the pair has become a conditioning tool for your legs rather than a strength tool.
- Under 8 reps on overhead press: that same pair is still a genuine strength tool for your shoulders.
- Both at once: one weight cannot serve both ends, and changing sets, tempo or rest does not close a gap that size.
From there you either accept slower leg progress and keep the reps high, or add a second pair. A 10kg pair at $79 sitting next to a 5kg pair at $49 covers both ends of that spread, and the second order ships free because $79 is over the threshold.
Delivered cost compared
Every price here is per pair, so a 5kg pair means two 5kg dumbbells. Delivery is free over $75 and $9.95 flat under $75, the same to Australia and New Zealand.
| What you order | Items subtotal | Delivery | Delivered total |
|---|---|---|---|
| Single 2kg pair | $29 | $9.95 | $38.95 |
| Single 3kg pair | $35 | $9.95 | $44.95 |
| Single 5kg pair | $49 | $9.95 | $58.95 |
| Single 10kg pair | $79 | Free | $79 |
| 2kg and 5kg pairs | $78 | Free | $78 |
| 5kg and 10kg pairs | $128 | Free | $128 |
| 3kg, 5kg and 10kg pairs | $163 | Free | $163 |
The row worth a second look is the two pair order at $78 delivered, which is less than the $79 delivered cost of the single 10kg pair and far less than the $97.90 you pay buying a 2kg pair and a 5kg pair in two separate orders. Nothing about the dumbbells changes, only how many times you pay the flat rate.
This is also the reason a single light pair is the worst value order on the list. On a $29 order the $9.95 flat rate is 34 per cent on top of the product, while on a $78 order it is nothing.
The two pair minimum for progression
If the goal is getting stronger rather than staying mobile, two pairs is the practical floor. One pair gives you one load, and one load means every lift in the session shares the same number whether that muscle group is strong or not.
Two pairs with a real gap between them give you a working weight and a lighter weight for every movement, plus somewhere to progress to when the reps climb. The size of the gap matters more than the exact numbers: 5kg and 10kg is two usable weights, while 4kg and 5kg is one weight bought twice.
- Heavy pair does: goblet squats, Romanian deadlifts, bent over rows, lunges, carries.
- Light pair does: overhead press, lateral raises, curls, rotator cuff work, warm up sets, last sets when form is fading.
- Aim for roughly double: 2kg with 5kg, 5kg with 10kg, or 10kg with 20kg. The range jumps from 5kg straight to 10kg, which suits this on its own.
Two pairs is also the point where hex heads earn their keep. The pair you are not using stays flat where you left it instead of rolling, which matters once there are four dumbbells on the floor rather than two.
Which two pairs to pick
Starting from nothing
- Lighter starting point: 2kg at $29 and 5kg at $49. $78 the pair of pairs, delivery free.
- Most common starting point: 5kg at $49 and 10kg at $79. $128, delivery free.
- Already training: 10kg at $79 and 20kg at $139. $218, delivery free.
If you already own one pair
Buy the pair that is roughly double what you own rather than the next one up the list. If you have the 5kg pair, the useful addition is the 10kg pair at $79, which clears $75 by itself so the second order ships free. If you have the 10kg pair, the 20kg pair at $139 is the matching heavy end, and the 2kg pair at $29 is the cheaper fix if your problem is shoulder work rather than squats.
What you do not want is the 4kg pair at $42 next to a 5kg pair. It reads like progression on an order form and gives you nothing in a session.
What one pair costs you in training options
The practical difference is the number of lifts you can load correctly in one session. With a single 5kg pair you can load presses, curls, rows and raises properly, and you can load squats and lunges only while you are new to them. With a 5kg and a 10kg pair, every lift in a full body session has a weight that suits it.
- Goblet squat: the heavy pair, or one dumbbell from it held at your chest.
- Romanian deadlift: the heavy pair, and it will outgrow that first.
- Overhead press: the light pair, for months before the heavy pair is pressable.
- Lateral raise: lighter again, usually the 2kg or 3kg pair even for strong lifters.
- Bent over row: the heavy pair, at 10-12 reps.
Read that list against your own program. If three or more of your regular lifts want different weights, you are buying a set. If your program is four movements at the same load, you are buying a pair.
Buying one pair now and a second later
Splitting the purchase is reasonable when cash flow is the constraint, and it costs nothing extra as long as each order clears $75. What it costs you is the wait: processing takes 1-2 business days, then 3-5 business days transit to metro Australia, 5-10 to regional Australia, and 7-14 to remote areas and New Zealand.
If you already know you want both pairs, one order means one wait instead of two, and a single $128 order for the 5kg and 10kg pairs ships free. If you are not sure the second pair will get used, buy the one you know you need now and see the staged buying plan for the rep trigger that tells you when to order the next one.
Recommended Gear
The single pair that suits Pilates, mat work and shoulder loading at $29.
$29 Rubber Hex Dumbbell Pair (3kg)A $35 light pair, and the lateral raise weight even once you squat heavy.
$35 Rubber Hex Dumbbell Pair (5kg)The most common single pair buy, and the light half of a two pair set.
$49 Rubber Hex Dumbbell Pair (10kg)$79, so it ships free on its own, and the heavy half of most two pair sets.
$79 Rubber Hex Dumbbell Pair (20kg)The heavy end at $139 if you already train and 10kg is your light pair.
$139Frequently Asked Questions
Is one pair of dumbbells enough to start?
One pair is enough if the work you do wants a single weight, which covers Pilates, rehab, shoulder rehabilitation and high rep circuits. A 5kg pair at $49 or a 2kg pair at $29 handles those programs on their own. One pair stops being enough as soon as your squats need a heavier weight than your overhead press can handle.
Do I need two pairs of dumbbells to get stronger?
For strength training, two pairs with a real gap between them is the practical minimum. One pair gives you one load, so every lift shares the same weight no matter how strong that muscle group is. A 5kg pair at $49 with a 10kg pair at $79 covers both ends, and the $128 order ships free because it is over $75.
Is a dumbbell set cheaper than buying single pairs?
The pairs cost the same individually, so a set is only cheaper through delivery. Orders over $75 ship free while orders under $75 pay a $9.95 flat rate, so two light pairs bought together at $78 beat the same two pairs bought in separate orders at $97.90. There is no bundle discount on the dumbbells themselves.
What two dumbbell weights should I buy first?
Aim for a light pair and a pair about double its weight. The common combinations are 2kg with 5kg at $78, 5kg with 10kg at $128, and 10kg with 20kg at $218 if you already train. All three clear the $75 threshold, so each one ships free to Australia and New Zealand.
How much does delivery cost on a single pair of dumbbells?
It depends on whether the pair is over $75. The 10kg ($79), 15kg ($109), 20kg ($139) and 25kg ($169) pairs ship free on their own. Anything from the 0.5kg pair at $19 up to the 5kg pair at $49 falls under $75 as a single item order and picks up the $9.95 flat rate.
Can I add a second pair later without paying delivery twice?
Yes, if the second order is over $75. A 10kg pair at $79 or heavier ships free by itself, so a follow up order costs nothing extra. A lighter follow up pair such as the 3kg at $35 comes to $44.95 delivered, so it is better added to an order you were placing anyway.
How big should the gap between two dumbbell pairs be?
Roughly double works for most people, because upper body pressing weights sit at about half of what you can squat or hinge with. The 5kg to 10kg step in this range does that on its own. A 4kg pair next to a 5kg pair is too close to give you a second usable weight.
Related Guides
- Staged Buying Plan: The three order plan and the rep trigger for adding each pair.
- How Many Pairs in a Starter Set: Sizing a first order by how many weights you will really use.
- The 5kg, 10kg and 15kg Set: Where a two pair set goes next, with the full three pair costs.
- Best Value Dumbbell Set: Cost per kilogram across the pairs in the range.
- What Size Dumbbells to Buy: Pick the actual numbers before you decide on one pair or two.
- Dumbbell Delivery Costs: The $75 threshold, the $9.95 flat rate and transit times.