I have a block on Magento where I would like to display the price of the current product in the default display currency. This store has multiple currencies.

When I invoke $product->getPrice(), I get the price of the product converted into the current currency. I can convert this into the the default display currency using this method:

public function convertToBaseCurrency(StoreInterface $store, $amount)
    $rateToBase = $this->currencyFactory->create()->load($store->getCurrentCurrencyCode())->getAnyRate($store->getDefaultCurrencyCode());
    return $amount * $rateToBase;

The above sort-of works but leads to rounding and calculation discrepancies.

I have a product that is 22.00 EUR in the database. When viewing the product under CHF, I get a price of 23.50 CHF. The multiplier in the directory_currency_rate table for EUR > CHF is 1.068200000000, which means the product's price should be 23.5004 but somehow it gets rounded down. This basically means that I cannot convert back the price back to EUR wihout some minor discrepancies. I've vardumped the product and it indeed is 23.5 internally.

Having dug in deeper, I can see that the conversion happens and gets rounded. There's a constant that defines the rounding in PriceCurrencyInterface called DEFAULT_PRECISION

How should I get around this?

1 Answer 1


AFAIK you should try to avoid writing your own method to convert the prices.

Stick to the following methods defined in Magento\Directory\Model\Currency:

  • convert($price, $toCurrency)
  • format($price, $options = [], $includeContainer = true, $addBrackets = false)

The first one converts a price to a currency (which is pretty much what you're doing in your custom method).

The second one formats the price by adding the rounding, the currency symbol and also the <span> container if you need it. You can change the precision by changing the second parameter to something like: $options['precision'] = 3

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