Estimate a Sri Lanka domestic electricity bill using meter readings, billing days, and the PUCSL-approved domestic tariff logic.
Quick planning, rough comparisons, and checking whether your assumptions are in the right range before you rely on final quotes or advice.
Review the assumptions below, then compare with related calculators if your decision depends on rates, eligibility, or provider-specific rules.
How this calculator works
- Pick the tariff category first, then enter only the values that category needs.
- Single-rate and block tariffs use one monthly units field, while TOU and bulk tariffs use peak, day, and off-peak units with maximum demand where required.
- Switch between CEB and LECO category lists. For unit-based tariffs, solar users can also estimate Net Metering, Net Accounting, or Net Plus outcomes with import and export values.
Worked example
For domestic usage of 120 kWh in a 30-day billing cycle, the estimated bill is LKR 3,280, up from LKR 3,040 under the tariff effective until 2026-03-31.
Important assumptions
- Tariffs follow the PUCSL approved table effective from 2026-04-01.
- The calculator also compares your estimate against the tariff that was effective until 2026-03-31.
- As of 2026-05-10, the latest verified approved tariff is still the April 1, 2026 table. PUCSL opened an extraordinary tariff review on 2026-04-29 with an estimated 18.11% revision requirement, but no later approval notice is modeled here yet.
- For domestic CEB estimates above 180 kWh, an extra comparison line also shows a provisional scenario that increases the total bill by 18%. This is a user-requested scenario view, not a verified approved tariff table.
- This version is intentionally simpler than the full CEB and LECO calculators and assumes a standard 30-day billing cycle.
- This breakdown treats the calculated charge as VAT-inclusive and adds only SSCL at 2.5% on top.
- For LECO, the official calculator can also show bill-specific adjustments such as fuel charges. Those additions are not modeled here yet, even when solar mode is used.
- For solar schemes, export-credit rates can vary by agreement and vintage. Net Accounting and Net Plus therefore use a user-entered export credit rate in this version.
Methodology and review
Shared calculator template reviewed for formula clarity and on-page transparency.
Editorial review focuses on practical accuracy, assumptions, and user-facing clarity.
Lankacalculator publishes these tools for practical planning, with the expectation that users will validate important decisions against primary sources.
How this calculation is produced
- This calculator uses the formula and assumptions defined for the page to turn your inputs into a practical planning estimate.
- Results are designed to be quick, transparent, and useful for first-pass decisions rather than provider-specific final quotes.
- The output should be treated as a directional estimate until you check the relevant rates, rules, or assumptions behind your case.
What to verify before relying on it
- Check that your units, assumptions, and scenario match the real decision you are trying to make.
- Compare the output with a second trusted source if the result affects money, health, or compliance.
- Use official provider, government, or expert information whenever the estimate needs to become a final decision.
When this tool is useful
- Use this for quick planning, early comparisons, and first-pass estimates.
- Use it when you need a decision baseline before opening a spreadsheet or asking for quotes.
- Use it again whenever the main assumptions behind the calculation change.
How to read the result
- Treat the primary result as an estimate that depends on the inputs and formula assumptions.
- Compare supporting metrics, not just the headline number, before making a decision.
- If the output affects spending or health decisions, validate it with a second source.
Common mistakes
- Entering optimistic assumptions and reading the result as certain.
- Comparing results from different tools without aligning units or definitions.
- Using one scenario only instead of testing a few realistic alternatives.
Good next steps
- Run a second scenario with stricter assumptions.
- Compare the output with related calculators or guide pages in the same topic.
- Use the result to narrow options, then confirm details with real provider or expert information.
FAQ
How do I calculate an electricity bill in Sri Lanka?
Choose the tariff category, enter the relevant units or meter-reading inputs, and the calculator applies the matching tariff logic plus the taxes modeled on this page.
Does this calculator support both CEB and LECO bills?
Yes. You can switch between CEB and LECO categories and estimate the bill using the supported tariff paths shown in the tool.
Does the electricity bill calculator use the new April 2026 tariff?
Yes. The estimate uses the approved tariff effective from April 1, 2026 and compares it against the tariff used until March 31, 2026. As of 2026-05-10, the later PUCSL extraordinary review is still treated here as a consultation-stage item rather than a newer approved tariff.
Can I estimate solar billing impact here?
Yes. For supported unit-based categories in both CEB and LECO mode, you can turn on a solar scheme and estimate the bill effect of import units, export units, carry-forward units, and export-credit rate assumptions.