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📊 Stop calculating total percentages like this!

📊 Stop calculating total percentages like this!

Because I found a better way. 😏

Finish it... and you'll never go back to your old ways.

Want to be good at Excel like this again?

Click Follow now 👉 @ Excel Data Master

# ExcelTips # ExcelTricks # TextToColumns # ExcelDataMaster # Easier to work# ExcelTips # ExcelTricks # TextToColumns # ExcelDataMaster # Easier Work # Excel # Spreadsheets # Corporate # Accounting # Finance # WorkHacks # Tutorial # sheetsets

2025/8/14 Edited to

... Read moreเวลาคนค้นหา “สูตร excel บวก ลบ คูณ หาร เปอร์เซ็นต์” ส่วนใหญ่เจอปัญหาเดียวกันคือ พอมี % ปนกับตัวเลขแล้วไม่มั่นใจว่าต้อง “คูณ” หรือ “หาร” กันแน่ ฉันเลยสรุปเป็นชีทจำง่าย ๆ พร้อมตัวอย่างที่เจอบ่อยอย่าง 250*20/100 ให้เลย 1) หลักพื้นฐาน: เปอร์เซ็นต์คือส่วนของ 100 - 20% = 20/100 = 0.2 ดังนั้นถ้าจะคิด 20% ของ 250 ใน Excel ทำได้ 2 วิธีที่ผลเหมือนกัน - =250*20/100 - =250*20% ข้อดีของการใช้ 20% คืออ่านง่ายและลดโอกาสพิมพ์ผิด 2) สูตรคูณ/ลดราคา/ภาษี (เจอบ่อยสุด) - “เอา 20% ของ 250” =250*20% - “ลดราคา 20% จาก 250” =250*(1-20%) - “บวก VAT 7% ให้ 250” =250*(1+7%) ทริค: ถ้าต้องการ “ยอดใหม่หลังเพิ่ม/ลด %” ให้จำรูปแบบ (1±%) ไว้ ใช้ได้แทบทุกเคส 3) สูตรบวก-ลบเปอร์เซ็นต์แบบชัด ๆ บางคนเผลอบวก 250+20% ซึ่งผิด เพราะหน่วยไม่เท่ากัน (บาท + อัตรา) ให้ใช้ - เพิ่ม 20%: =250 + (250*20%) หรือ =250*(1+20%) - ลด 20%: =250 - (250*20%) หรือ =250*(1-20%) 4) สูตรหารเพื่อ “ย้อนกลับหา ก่อนเพิ่ม/ลดเปอร์เซ็นต์” อันนี้มักพลาดเวลาเจอราคาหลังบวก VAT แล้วอยากย้อนกลับ - ถ้า 250 คือ “หลังบวก VAT 7% แล้ว” ราคาก่อน VAT =250/(1+7%) - ถ้า 250 คือ “หลังลด 20% แล้ว” ราคาก่อนลด =250/(1-20%) 5) คิด % ของยอดขายรวม (เหมาะกับตาราง เดือน / ยอดขาย / รวม (%)) ถ้าคุณมีคอลัมน์ “ยอดขาย” เช่นอยู่ที่ C3:C24 และต้องการ % ต่อรวมทั้งหมด - ในแถวแรกของ % (เช่น D3) ใส่: =C3/SUM($C$3:$C$24) - แล้วจัดรูปแบบเป็น Percentage (%) จากนั้นลากลงทั้งคอลัมน์ จุดสำคัญคือใส่ $ เพื่อ “ล็อกช่วงรวม” ไม่ให้เลื่อนตอนลากสูตร 6) เช็กความถูกต้องเร็ว ๆ - ผลรวมของคอลัมน์ % ของยอดขายรวมควรใกล้ 100% (อาจคลาดเล็กน้อยจากการปัดเศษ) - ถ้าคิดแล้วได้ 0 หรือเลขแปลก ๆ ให้ดูว่าเซลล์เป็น “ข้อความ” หรือมีเครื่องหมายคอมมา/เว้นวรรคแปลก ๆ สรุปจำง่าย: อยากได้ “% ของจำนวน” ให้คูณ (%), อยากย้อนกลับ “ก่อนเพิ่ม/ลด” ให้หารด้วย (1±%), และถ้าคิด “% ของยอดขายรวม” ให้เอายอดแต่ละเดือนหารด้วย SUM ของทั้งช่วง แล้วล็อกช่วงด้วย $

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