CEB Electricity Bill Calculator (May 2026)
Electricity in Sri Lanka is calculated on a tricky two-tier block system. Use our calculator to see exactly how your bill is broken down into energy charges and fixed costs, updated for the May 2026 PUCSL tariffs.
Domestic Usage
Check your meter or your last 30-day bill cycle.
Estimated Monthly Bill
Unit Charge Breakdown
How the CEB and LECO bill estimate works
Domestic electricity is not charged at one flat rate. The applicable block structure depends on total consumption, and the fixed charge follows the highest block reached during the billing period.
For a standard 30-day cycle, customers using up to 60 kWh remain in the lower block structure. At 61 kWh, the 0-60 kWh portion moves to the tariff used for consumption from 61 to 180 kWh. Consumption above 180 kWh uses a separate two-block structure.
Domestic electricity tariff blocks from May 2026
The table below summarizes the rates configured in this calculator for a 30-day billing cycle.
| Total monthly use | Energy charge | Fixed charge |
|---|---|---|
| 0-30 kWh | First 30 at Rs. 5.00/kWh | Rs. 80 |
| 31-60 kWh | First 30 at Rs. 5.00; balance at Rs. 9.00 | Rs. 210 |
| 61-90 kWh | First 60 at Rs. 14.00; balance at Rs. 20.00 | Rs. 400 |
| 91-120 kWh | Next block at Rs. 28.00/kWh | Rs. 1,000 |
| 121-180 kWh | Next block at Rs. 44.00/kWh | Rs. 1,500 |
| Above 180 kWh | First 180 at Rs. 32.50; balance at Rs. 100.00 | Rs. 2,500 |
Worked example for 95 units
For 95 kWh in 30 days, the energy charge is Rs. 840 for the first 60 units, Rs. 600 for units 61-90, and Rs. 140 for units 91-95. Adding the Rs. 1,000 fixed charge gives an estimated bill of Rs. 2,580.
Estimated CEB bill at common monthly consumption
Typical Sri Lankan household consumption sits between 60 and 180 units a month. These figures come from the same tariff the calculator applies, for a standard 30-day cycle.
Notice how steeply the bill climbs past 180 units: every unit above that is charged at Rs. 100, against Rs. 32.50 for the first 180. A household at 250 units pays more than twice what one at 180 units pays, for 39% more electricity.
| Monthly use | Energy charge | Fixed charge | Estimated bill |
|---|---|---|---|
| 30 kWh | Rs. 150 | Rs. 80 | Rs. 230 |
| 60 kWh | Rs. 420 | Rs. 210 | Rs. 630 |
| 90 kWh | Rs. 1,440 | Rs. 400 | Rs. 1,840 |
| 120 kWh | Rs. 2,280 | Rs. 1,000 | Rs. 3,280 |
| 150 kWh | Rs. 3,600 | Rs. 1,500 | Rs. 5,100 |
| 180 kWh | Rs. 4,920 | Rs. 1,500 | Rs. 6,420 |
| 200 kWh | Rs. 7,850 | Rs. 2,500 | Rs. 10,350 |
| 250 kWh | Rs. 12,850 | Rs. 2,500 | Rs. 15,350 |
| 300 kWh | Rs. 17,850 | Rs. 2,500 | Rs. 20,350 |
The two thresholds that matter most
Two points in the tariff change the bill out of proportion to the extra electricity used, and both catch households out.
At 61 units, the first 60 units stop being charged at Rs. 5.00 and Rs. 9.00 and are re-priced at Rs. 14.00, while the fixed charge nearly doubles from Rs. 210 to Rs. 400. One extra unit takes the bill from Rs. 630 at 60 units to Rs. 1,260 at 61 - it doubles.
At 181 units the whole bill moves onto the high-use structure: the first 180 units are re-priced at Rs. 32.50, the fixed charge rises to Rs. 2,500, and every further unit costs Rs. 100. One unit takes the bill from Rs. 6,420 at 180 units to Rs. 8,450 at 181, a jump of more than Rs. 2,000. If your usage hovers near either threshold, a small reduction can be worth far more than it looks.
Common electricity bill mistakes
A bill estimate can differ when the billing period is not exactly 30 days or when the number entered is a meter reading instead of units consumed.
- Enter the difference between current and previous meter readings.
- Check the number of days shown on the bill before comparing estimates.
- Do not compare a domestic tariff estimate with a business or time-of-use account.
- Use the PUCSL calculator for the authoritative billing-period adjustment.
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