Setting up price rounding rules in 1C-Bitrix

Configuring Price Rounding Rules in 1C-Bitrix

Price rounding in 1C-Bitrix is the point where a mathematically correct result is perceived as an artifact. A 7% discount on a product priced at 349 gives 324.57. Displaying such a price in a storefront is undesirable. Bitrix addresses this through rounding rules in the catalog module.

Where Rounding Is Configured

"Settings → Product Settings → Catalog → Price Rounding". In earlier versions — in the settings of the bitrix:catalog.element and bitrix:catalog.section components, with separate parameters PRICE_VAT_INCLUDE and individual rounding settings.

Global rounding rules — CCatalogProduct::getRoundRules() reads from b_catalog_rounding_rule.

Types of Rounding Rules

Programmatic Rule Configuration

// Adding a rounding rule
\Bitrix\Catalog\RoundingTable::add([
    'CATALOG_GROUP_ID' => $priceTypeId, // 0 = all price types
    'PRICE_FROM'       => 0,
    'PRICE_TO'         => 999.99,
    'ROUND_TYPE'       => \Bitrix\Catalog\RoundingTable::ROUND_MATH,
    'ROUND_PRECISION'  => 0, // round to whole numbers
]);

// For prices from 1000 — a different rule
\Bitrix\Catalog\RoundingTable::add([
    'CATALOG_GROUP_ID' => $priceTypeId,
    'PRICE_FROM'       => 1000,
    'PRICE_TO'         => null,
    'ROUND_TYPE'       => \Bitrix\Catalog\RoundingTable::ROUND_MATH,
    'ROUND_PRECISION'  => -1, // round to tens
]);

ROUND_PRECISION — number of decimal places (negative values round to tens, hundreds).

Rounding in Cart and Storefront

Rounding rules are applied when computing the final price via CCatalogProduct::GetOptimalPrice(). In the cart component — when recalculating the line total. Important: VAT is added after rounding the base price, not before.

Psychological Pricing

For prices ending in ".99", rounding rules are not suitable — this is a marketing task solved by a post-processing handler. For example, an OnSaleOrderBeforeSaved event handler or a custom price recalculation method.

Timeline

Configuring rounding rules for all price types — 1–3 hours. Custom logic (psychological pricing, different rules for categories) — 4–8 hours.