People ask for a per-day rate and a per-hour rate as if both were the salary divided by something obvious. For a monthly employee the Employment Act 1955, section 60I, is specific. The ordinary rate of pay for one day is the monthly wages divided by 26. The hourly rate is that ordinary day divided by the normal hours of work. It is not the monthly wage divided by 30, and it is not the wage divided by the number of days the shop happened to open.
The load button is RM3,900 and 8 hours. 3,900 / 26 is RM150.00. 150 / 8 is RM18.75 an hour. The same salary divided by 30 is RM130.00. That third number is on the result so a calendar split can be seen and rejected. Using RM130 as the ordinary day will understate every overtime hour that is built on it. A wage of RM2,600, the overtime example, is RM100 a day and RM12.50 an hour on the same 8-hour day.
If you are daily-rated, the ordinary rate of pay is the daily wage itself. Switch the basis, type that wage, and type the normal hours. A RM100 day over 8 hours is RM12.50 an hour, which matches the monthly example only because RM2,600 / 26 happens to be RM100. The two bases are not interchangeable. A daily-rated rest day also pays differently: half a day or less is one day's wages, and more than half up to a normal day is two days. Those multipliers are on the overtime page, which prices the monthly rest-day bands. Do not add them twice.
Normal hours are the hours the contract calls normal, not the hours you stayed. The form accepts a day up to 24 so a shift can be typed, and it will not invent a lunch break. If the normal day is 7.5 hours, type 7.5. The hourly rate rises because the same ordinary day is spread over fewer hours. That is the Act's division, not a raise.
The 26-day rule here is the Peninsular Employment Act. Sabah and Sarawak labour ordinances are separate documents. A contract can define a richer day rate; it cannot be assumed from this page. Once you have the hour, weekday overtime starts at 1.5 times it. The 2026 net salary page is a different question: EPF, SOCSO, EIS, and PCB on a monthly wage, not the price of one extra hour.