Labour has made an election promise to cap public transport at $20 a week in Auckland, Wellington and Christchurch, and $10 everywhere else.

As Kiwis continue to wince at the petrol pump, Labour has swooped in, offering a cheaper ride. But the maths doesn't add up.

For the price of a couple of coffees, Labour says Kiwis could get to work all week. But is it really that simple?

The opposition party's first election policy in more than six months, which was announced last week, promises to cap public transport costs at $20 a week per person in Auckland, Wellington and Christchurch, and $10 everywhere else.

It's being pitched as cost-of-living relief, to protect Kiwis' wallets at a time when global tensions are pushing fuel prices higher, and household budgets are stretched.