Contact
Contact HarnDuay
If you have questions about the calculator, policy pages, or business use, contact the HarnDuay team using the details below.
Support and business contact
Email: support@khaikhlong.com
Please include the page you were using and a short description of the issue so the team can respond more efficiently.
Privacy note
Do not send sensitive payment information through email.
If you are reporting a calculation problem, share only the minimum information needed to reproduce it.
Common mistakes
- Forgetting to separate items some people did not consume, such as desserts, drinks, or add-ons.
- Splitting VAT and service equally even when food totals differ a lot.
- Not marking who paid up front, which causes the reimbursement summary to point to the wrong person.
Tips for faster bill splitting
- Add everyone first, then enter receipt items to reduce backtracking.
- Use the duplicate action when your receipt has several similar lines.
- Combine quantity with split weights when one item has uneven portions.
Try it with your real receipt
Add your friends, enter receipt items, adjust VAT or service charge if needed, and share the final summary link instantly.
Related pages
Split bill calculatorCalculate each person's share for mixed restaurant bills.Share food costHandle shabu, barbecue, drinks, and uneven food orders.Share travel expenseTrack group trip spending for hotels, fuel, and tickets.Tip calculatorSplit tips and service charge fairly across a group.VAT calculatorCalculate Thai VAT 7% and total payable amounts quickly.Privacy PolicyRead how HarnDuay handles user data and analytics.