# Money and rounding

Thor money values use `centAmount`, `currencyCode`, and `fractionDigits`.
Despite the name `centAmount`, the integer is expressed in the currency's minor unit.
Use the returned fraction digits when formatting it.

## Display, do not recalculate

For EUR, `1099` with two fraction digits represents EUR 10.99.
An amount with zero fraction digits represents whole currency units.
Use a currency formatter for display and keep stored amounts as integers or a suitable decimal money type.


Format money

```typescript
export function formatMoney(money: {
  centAmount: number;
  currencyCode: string;
  fractionDigits: number;
}, locale = "en-GB") {
  return new Intl.NumberFormat(locale, {
    style: "currency",
    currency: money.currencyCode,
    minimumFractionDigits: money.fractionDigits,
    maximumFractionDigits: money.fractionDigits,
  }).format(money.centAmount / 10 ** money.fractionDigits);
}

```


This helper formats one returned amount.
It is not a checkout calculator.
If your client receives amounts outside JavaScript's safe integer range, use a representation that preserves their precision before formatting.

## Rounding belongs to commerce calculation

Stores have separate price and tax rounding defaults.
Supported modes include `TO_EVEN`, `AWAY_FROM_ZERO`, and `TO_ZERO`.
Read the [rounding enum](/api/admin-graphql/enums/rounding-mode) when choosing a policy.

Render returned line totals, discounts, tax portions, shipping, and grand total.
Summing formatted unit prices can disagree with a calculated total because discounts and rounding apply at different levels.
See [Cart calculation and totals](/concepts/checkout/calculation).