Electricity Unit Cost Calculator
Enter your total bill and units consumed to calculate the real cost per unit — typically Rs. 35-60, which is 40-60% higher than the published slab rate due to FPA, QTA, GST, and surcharges.
Actual Per-Unit Cost
Bill Component Breakdown — What Makes Up Your Per-Unit Cost
| Bill Component | Typical Amount (300 units) | Per-Unit Equivalent |
|---|---|---|
| Base energy charge (slab) | Rs. 7,200 | Rs. 24.00 |
| FPA (Fuel Price Adjustment) | Rs. 750 | Rs. 2.50 |
| QTA (Quarterly Adjustment) | Rs. 300 | Rs. 1.00 |
| GST (17%) | Rs. 1,402 | Rs. 4.67 |
| Meter rent + surcharges | Rs. 350 | Rs. 1.17 |
| TOTAL | Rs. 10,002 | Rs. 33.34 |
How This Calculation Works
Most consumers are shocked to learn their real per-unit cost is Rs. 35-60 — far above the Rs. 20-30 slab rate they see in NEPRA notifications. The difference comes from charges layered on top of the base rate. This calculator reveals your actual cost, which is essential for accurate comparisons with solar, generator, or UPS alternatives.
Compare with: AC electricity cost, solar savings. Understand charges: FPA explained, QTA explained.
Why Your Real Cost Per Unit Matters
Knowing your actual per-unit cost is essential for three critical decisions: (1) evaluating whether solar panels are worth the investment — if your per-unit cost is Rs. 50+, solar payback drops below 4 years; (2) comparing generator costs fairly — a generator at Rs. 90/unit is only 2x grid power if your grid cost is Rs. 45/unit, not 3x; (3) understanding which appliances are genuinely expensive to run — an inverter AC at Rs. 45/unit costs very differently than one at Rs. 25/unit.
The per-unit cost also reveals billing errors. If your calculated cost seems abnormally high (above Rs. 65/unit for residential), your bill may contain errors, unauthorized charges, or you may be on a wrong tariff category. Compare with neighbors using similar consumption to spot anomalies.
Tracking Your Per-Unit Cost Over Time
Calculate your per-unit cost every month and track the trend. FPA changes cause month-to-month variation of Rs. 3-8 per unit. Summer months (high FPA from thermal generation) are more expensive per unit than winter months (high hydro, low FPA). This seasonal pattern helps you plan: shifting heavy consumption to winter months (when feasible) saves money because the per-unit rate is genuinely lower.
Seasonal Per-Unit Cost Variation
Your per-unit cost isn't constant throughout the year — it fluctuates by Rs. 3-8 depending on FPA (which changes monthly based on actual generation fuel costs). Summer months typically have the highest per-unit costs because expensive thermal power plants run at peak capacity when hydroelectric generation can't meet demand. Winter and monsoon months see lower per-unit costs as cheap hydro generation increases. Track your per-unit cost monthly to see this pattern in your own bills — it reveals the best months for running energy-intensive appliances and the worst months to have high consumption.
Estimates only. Calculator results are approximate based on current standard rates and formulas. Actual amounts may vary due to regulatory changes, provider-specific charges, and individual circumstances. Verify with official sources for exact figures.
Per-Unit Cost — Understanding Your Real Electricity Price
The slab rate is just the base energy charge — one of five cost layers. FPA, QTA, GST (17%), and surcharges add 40-60% on top. A Rs. 24/unit slab rate becomes Rs. 33-40/unit effective cost after all charges.
Protected consumers (under 200 units): Rs. 20-30/unit effective. Non-protected (200-700 units): Rs. 35-55/unit. Above 700 units: Rs. 55-65/unit. These are total effective costs including all charges.