pricemaths.php

См. документацию.

<?php
 
namespace Bitrix\Sale;
 
use Bitrix\Main;
 
class PriceMaths
{
    private static ?int $valuePrecision = null;

    public static function roundPrecision($value)
    {
        if (!isset(self::$valuePrecision))
        {
            self::$valuePrecision = (int)Main\Config\Option::get('sale', 'value_precision');
            if (self::$valuePrecision < 0)
            {
                self::$valuePrecision = 2;
            }
        }
 
        return round((float)$value, self::$valuePrecision);
    }

    public static function roundByFormatCurrency($price, $currency)
    {
        return (float)SaleFormatCurrency($price, $currency, false, true);
    }
}