die Gesamtsumme
total sum
The total amount that results from adding several individual amounts or items.
Die Gesamtsumme auf der Rechnung betrug 127,50 Euro.
The total sum on the invoice was 127.50 euros.

total sum
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total sum
The total amount that results from adding several individual amounts or items.
Die Gesamtsumme auf der Rechnung betrug 127,50 Euro.
The total sum on the invoice was 127.50 euros.

The word is a clear compound of 'gesamt' (total, whole) and 'die Summe' (the sum). So it literally refers to the total or whole sum.
Bitte prüfen Sie die Gesamtsumme am Ende des Kostenvoranschlags.
Please check the total sum at the end of the cost estimate.
'Gesamtsumme' (total sum) is often combined with certain verbs that indicate an amount. Typical verbs are 'betragen' (to amount to), 'sich belaufen auf' (to come to), or 'ergeben' (to produce/result in).
Die Gesamtsumme aller Spenden beläuft sich auf über 5.000 Euro.
The total sum of all donations comes to over 5,000 euros.
You will almost always find this word in a financial or commercial context. It often appears on invoices, receipts, quotes, or in balance sheets.
Überprüfen Sie den Kassenbon, um die Gesamtsumme zu sehen.
Check the receipt to see the total sum.
sum
'die Summe' and 'die Gesamtsumme' can both mean an amount of money or a result from several numbers. 'die Summe' is more general: it can be a single amount or the result of a calculation. 'die Gesamtsumme' emphasizes more strongly that all individual amounts or items have been added together. Learners may confuse the words because both occur with bills and money. If only one amount is meant, 'die Summe' fits better. If you want to say clearly that everything together is meant, 'die Gesamtsumme' is more precise.

Nach dem Einkauf hat Luisa die Gesamtsumme noch einmal geprüft.
After shopping, Luisa checked the total sum once more.
Die Summe auf der Rechnung stimmt nicht.
The sum on the bill is not correct.