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Calculate total amount using exchange rate

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Posted on by MarwaAlhajri

Hi guys ,

I have a table with exchange rates based on each date"Used power automate to generate rates from free exchange rate API"

now I want to calculate the total amount based on the currency we select

like qucantity*unit price/exchange rate

I used the code

With(

{

wRate:

LookUp(

'Currency Rate to USD',

'Created Date' = DataCardValue3.SelectedDate

)

Value(TextInput3_2.Text) *

Switch(

Dropdown2_1.Selected.Value,

"USD",

wRate.'Created Date',

"AED",

wRate.'Created Date',

"OMR",

wRate.'Created Date'

)

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Building Power Apps

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Gerard Simpson 2,987 Moderator on at

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Hi - in your switch, you are referencing the 'Created Date' field - this should be 'Currency Rate to USD'

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MarwaAlhajri on at

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Hi Thanks for the reply,
I change it to the currency rate to USD but now I think the amount is showing wrong
it's correct for OMR but if I change it to USD it is the same is it only taking one value which is OMR

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timl 36,715 Super User 2026 Season 1 on at

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Hi @MarwaAlhajri

In the OnChange property of Dropdown2_1, you would need to call Reset on your Total Price text input control (eg, Reset(txtTotalPrice) ) if you want the value to update after changing the exchange rate.

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MarwaAlhajri on at

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Hi, thanks for your reply,
I did as you said, but still, the value didn't change
I changed the value of the dropdown box which contains currency USD, OMR AED ONChange value to
Reset(TextInput3_3)

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Gerard Simpson 2,987 Moderator on at

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Hi - The initial LookUp is just grabbing the first row of the data and then this is passed through to the switch logic.

Can you try this instead - this creates a filter table based on the date, which is then passed through and a lookup applied to grab the correct row of the filtered table...

With(

{

wRate:

Filter(

'Currency Rate to USD',

'Created Date' = DataCardValue3.SelectedDate

)

},

Value(TextInput3_2.Text) * LookUp(wRate, Title = Dropdown2_1.Selected.Value).'Currency Rate to USD'

)

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