Electric Bill Calculator

Step-by-Step Guide

1. 1Enter your consumption: Input your electricity usage in kWh for the billing period, found on a past bill or from your meter reading difference.
2. 2Select a billing type: Choose Flat Rate if your utility charges one price per unit, or Tiered (Slab) if it charges different rates across consumption bands.
3. 3Set your rates: For flat rate, enter the price per kWh. For tiered, enter the minimum and maximum kWh and rate for each band, or start from a built-in preset.
4. 4Add fixed charges and tax: Enter your service charge, meter charge, and tax percentage so the subtotal and final total match your actual bill structure.
5. 5Review the breakdown: The results panel shows cost per tier (if tiered), the subtotal, tax amount, and final total bill in your selected currency.
6. 6Save or export the calculation: Save the result to history for comparison across months, or export the full breakdown as a CSV or text file.

What This Calculator Provides

• ✓Real-time calculation as you type
• ✓Flat rate and tiered (slab) billing support
• ✓Multi-currency: BDT, USD, EUR, GBP, INR
• ✓Built-in presets for Bangladesh, India, USA, and UK tariffs
• ✓Per-band cost breakdown for tiered billing
• ✓Service charge, meter charge, and tax fields
• ✓Calculation history (saved locally)
• ✓CSV export for spreadsheets
• ✓Text export for records
• ✓No signup required

Pro Tips

• 💡Start from a built-in preset if your tariff matches Bangladesh, India, USA, or UK residential structures, then adjust individual slab rates if your local utility has since updated them — it's faster than building the band structure from scratch.
• 💡If you're near a tiered billing threshold, calculate both your current usage and a slightly reduced figure. Crossing below a band boundary can save more than the raw kWh reduction suggests, since it also lowers the rate on units within that band.
• 💡Enter service charge and meter charge as separate fields even if your bill lists them together — it keeps the breakdown transparent and makes it easier to spot when a utility raises a fixed fee independent of your usage.
• 💡Save a calculation to history every billing cycle if you're tracking usage trends. Comparing month over month makes it easy to see how much of a bill increase came from higher consumption versus a rate change.
• 💡Use tiered mode even for a nominally flat-rate tariff that has a single "lifeline" discount for the first block of units — model it as a two-band tiered structure rather than forcing it into the flat-rate field.

Common Mistakes to Avoid

• ✕Applying the top slab's rate to all units instead of only the units within that band. Tiered billing charges each band at its own rate — a 450 kWh bill isn't 450 × the highest rate, it's the sum of each band's units at that band's own rate.
• ✕Forgetting to include tax in the comparison when checking this calculator against your actual bill. The subtotal (energy cost + fixed charges) is taxed as a whole, so compare the final total, not the subtotal, to your bill.
• ✕Overlapping or leaving gaps between slab ranges when building a custom tiered structure. Each band's minimum should be exactly one unit above the previous band's maximum, or units will be double-counted or skipped entirely.
• ✕Using an outdated preset rate. Utility tariffs change periodically — treat the built-in presets as a starting structure and verify the current rates against your utility's published tariff schedule before relying on the result.
• ✕Mixing currencies between the rate you enter and the currency selector. If your slab rates are in local currency but the selector is left on a different currency, the total will display with the wrong currency label even though the math is otherwise correct.