What is the difference between connected load and consumed units?

Connected load is the total wattage of all appliances in your home (e.g., 5kW if all appliances are on simultaneously). Consumed units (kWh) depend on how long each appliance actually runs. An appliance with high wattage used briefly contributes less to the bill than a moderate appliance running all day.

Is electricity bill tax included in the per-unit rate?

It depends on your state. Some DISCOMs include taxes (electricity duty, fuel adjustment charge) in the per-unit rate shown on the bill. Others show taxes separately. Enter the base per-unit rate in this calculator and use the tax field for any percentage-based surcharge shown separately on your bill.

Electricity Bill Calculator

Enter your meter reading, unit rate, and fixed charges to calculate your exact electricity bill.

⚡ What is an Electricity Bill Calculator?

An electricity bill calculator helps you estimate your electricity charges based on the number of units (kWh) you have consumed during a billing period, the per-unit tariff rate set by your electricity distributor, any fixed monthly charges, and applicable taxes or surcharges. Rather than waiting for your monthly bill or manually working through the arithmetic, this tool gives you an instant, accurate estimate.

Electricity bills affect every household and business. In India, the average monthly residential bill ranges from ₹500 to ₹3,000 depending on state, season, and appliance usage. During summer, air conditioning can double or triple a household's consumption. Knowing how your bill is calculated helps you identify where to save - whether it is shortening AC usage, switching to inverter technology, or replacing old incandescent bulbs with LEDs.

A common source of confusion is the difference between connected load (total wattage of all your appliances) and units consumed (actual kWh used). Your bill is based on consumed units, not connected load. An air conditioner rated at 1,500W only consumes that power while running - if it runs for 8 hours, it uses 12 units. An LED bulb at 10W running 24 hours a day for 30 days uses only 7.2 units for the entire month.

This calculator covers the standard billing formula: energy cost plus fixed charge plus tax. For slab-based tariffs (common across Indian DISCOMs), enter your blended average rate - total energy charges from your bill divided by units consumed - to get accurate results.

📐 Formula

Energy Cost = Units × Rate per Unit

Units = kWh consumed in the billing period

Rate = cost per kWh (₹/unit) from your tariff schedule

Total Bill = Energy Cost + Fixed Charge + Tax

Fixed Charge = flat monthly meter/demand charge (₹)

Tax = (Energy Cost + Fixed Charge) × Tax Rate / 100

Example: 250 units × ₹6.50 = ₹1,625 energy + ₹100 fixed = ₹1,725 subtotal. 0% tax → Total: ₹1,725

📖 How to Use This Calculator

Steps to Calculate Your Electricity Bill

Find your units consumed - subtract the previous meter reading from the current reading to get kWh used this billing period.

Enter the per-unit rate - look for "Energy Charges" or "Unit Rate" on your electricity bill. If your DISCOM uses slabs, use your blended rate (total energy charges ÷ units consumed).

Add fixed charges - enter the flat monthly meter rent or demand charge shown on your bill. Enter 0 if not applicable.

Click Calculate to see your total bill, energy cost breakdown, tax, daily cost, and annual projection.

💡 Example Calculations

Example 1 — Typical Urban Household (Summer)

350 units consumed, ₹7/unit, ₹150 fixed charge, 5% tax

Energy Cost: 350 × ₹7 = ₹2,450

Subtotal with Fixed Charge: ₹2,450 + ₹150 = ₹2,600

Tax (5%): ₹2,600 × 0.05 = ₹130

Total Bill: ₹2,600 + ₹130 = ₹2,730

Total Monthly Bill = ₹2,730 | Annual Estimate: ₹32,760

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Example 2 — Small Office / Shop

600 units consumed, ₹8.50/unit, ₹300 fixed charge, 0% tax

Energy Cost: 600 × ₹8.50 = ₹5,100

Total with Fixed Charge: ₹5,100 + ₹300 = ₹5,400

Total Monthly Bill = ₹5,400 | Cost per Day ≈ ₹180

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Example 3 — Low-consumption Household (No AC)

120 units consumed, ₹5/unit, ₹50 fixed charge, 0% tax

Energy Cost: 120 × ₹5 = ₹600

Total with Fixed Charge: ₹600 + ₹50 = ₹650

Total Monthly Bill = ₹650 | Annual Estimate: ₹7,800

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❓ Frequently Asked Questions

How is an electricity bill calculated in India?+

Electricity bill = (Units consumed × per-unit tariff rate) + fixed/meter charge + applicable taxes and duties. Most states use a slab-based tariff where the rate per unit increases as you use more. This calculator uses a flat per-unit rate; consult your state electricity board (DISCOM) for slab-specific rates.

What is 1 unit of electricity?+

1 unit of electricity equals 1 kilowatt-hour (kWh) - the energy used by a 1,000W appliance running for 1 hour. Equivalently, a 100W bulb running for 10 hours uses 1 unit. Your electricity meter counts units consumed.

How do I read my electricity meter?+

Note the reading on your meter at the start of the billing period and at the end. The difference is your consumption in kWh (units). Modern digital meters display cumulative units. Smart meters may also show real-time consumption. The billing period is usually 1 or 2 months.

What is a fixed charge or meter rent on an electricity bill?+

A fixed charge (also called demand charge or meter rent) is a flat amount charged every billing cycle regardless of how many units you use. It covers the cost of infrastructure - wires, poles, meters - and is usually a few hundred rupees per month.

What are electricity tariff slabs in India?+

Many Indian DISCOMs charge a lower rate for the first 100–200 units per month and progressively higher rates for additional units. For example, some states offer subsidised rates for consumers below 100 units/month. This calculator uses a single flat rate - for exact slab calculations, enter your blended average rate (total energy charges ÷ units).

How much electricity does a 1.5-ton AC use per hour?+

A 1.5-ton non-inverter AC uses roughly 1.5 kWh per hour. A 5-star inverter AC uses approximately 0.8–1.0 kWh per hour. Running an inverter AC for 8 hours/day for 30 days uses about 240 units - a significant portion of most household bills.

How do I calculate the electricity cost of a specific appliance?+

Formula: Units per day = (Wattage × Hours used per day) / 1000. Monthly cost = Units per day × 30 × per-unit rate. Example: 1,500W geyser used 1 hour/day: 1.5 units/day × 30 = 45 units/month. At ₹6/unit: 45 × 6 = ₹270/month just for the geyser.

How do I reduce my electricity bill?+

The biggest savings come from: switching to 5-star rated inverter ACs; setting the AC to 24°C instead of 18°C (saves ~6% per degree); using LED bulbs instead of incandescent; running washing machines and geysers during off-peak hours; and fixing dripping taps that cause geysers to cycle unnecessarily. Small habitual changes compound into significant monthly savings.

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📌 Quick Tips

💡Check your electricity meter reading at the start and end of the month. The difference is your monthly units consumed (kWh).

💡Your per-unit rate is printed on your electricity bill, usually under 'Energy Charges' or 'Unit Rate'. It varies by slab in many states.

💡High-consumption appliances - air conditioners, geysers, electric heaters - account for 50–70% of most household bills. Targeting these gives the biggest savings.

💡1 unit = 1 kilowatt-hour (kWh) = using a 1,000W appliance for 1 hour, or a 100W bulb for 10 hours.

💡Compare your bill month-over-month using the Percentage Change Calculator to track consumption trends.