How to Calculate Prorated Salary: Examples

Prorated salary pays employees for the actual days/months worked — used when starting mid-month, resigning, or taking unpaid leave.

Daily-Rate Formula

Prorated salary = (monthly salary ÷ days in month) × days worked

Example

Salary 30,000 THB, starting January 15 (31-day month):

• Daily rate = 30,000 ÷ 31 ≈ 967.74 THB
• Worked 17 days (Jan 15-31) → 967.74 × 17 ≈ 16,451.61 THB

Alternative Bases

Some companies use 30 days or only working days (e.g., 22 days/month):

• 30,000 ÷ 30 = 1,000 THB/day
• 30,000 ÷ 22 = 1,363.64 THB/working day

Where It Applies

• Mid-month hires/resignations
• Unpaid leave (LWOP)
• Mid-month position/salary changes

Tips

• Ask about company policy (30 days vs calendar)
• Check whether public holidays count as working days

Try the salary proration calculator to calculate now.