The three items
- Energy value: each slab at its price, only on what falls within it.
- Fixed charge: set by breaker size, unaffected by consumption.
- VAT: 15% on the above.
Example: a 1,500 SAR bill
A residential bill with everything included, current tariff, breaker under 100 A:
| Remove VAT: 1,500 ÷ 1.15 | 1,304.35 SAR |
| Remove fixed charge: 1,304.35 − 10 | 1,294.35 SAR |
| First 6,000 kWh × 18 halalas | 1,080.00 SAR |
| Remaining 214.35 ÷ 30 halalas | 714.5 kWh |
| Correct consumption | 6,714.5 kWh |
Direct division, 1,500 ÷ 0.18, gives 8,333 kWh, about 24% too high. A system built on that number would be larger than you need.
Do not rely on one month
Consumption is seasonal in the Kingdom. Twelve months of bills are best. Otherwise we build an estimated seasonal curve that you can adjust in the calculator.
Try with your bill