Electricity Unit Calculator: Calculate kWh Usage, State-wise Rates & Monthly Bill (India 2026)

An electricity "unit" is officially called a kilowatt-hour (kWh). It's the amount of energy consumed when a 1,000-watt (1 kW) appliance runs for 1 hour. That's it — deceptively simple, but let's make it concrete.

The kWh Formula

Units Consumed (kWh) = Power (Watts) × Time (Hours) ÷ 1,000

Everyday Examples

• A 1.5-ton AC (1,500W) running for 8 hours = 1,500 × 8 ÷ 1,000 = 12 kWh (12 units)
• A 100W ceiling fan running for 12 hours = 100 × 12 ÷ 1,000 = 1.2 kWh
• A LED bulb (9W) running for 10 hours = 9 × 10 ÷ 1,000 = 0.09 kWh
• A washing machine (500W) for 1 hour = 500 × 1 ÷ 1,000 = 0.5 kWh

Monthly Consumption Calculation

To find monthly consumption: multiply daily kWh by 30 (days). If your AC runs 8 hours daily for 30 days: 12 kWh/day × 30 = 360 units/month. At ₹7/unit, that AC costs you ₹2,520/month to run — before you add any other appliances.

Understanding Power Ratings on Appliances

Every electrical appliance in India has a BEE (Bureau of Energy Efficiency) star rating and a wattage label. Higher star rating = more efficient = fewer units consumed for the same output.

Here is a comprehensive table of average power consumption for common Indian household appliances, with estimated monthly costs at ₹7 per unit (average across states):

Home Appliance Power Consumption — India 2026

Quick Monthly Bill Estimator — Typical Indian Home

Electricity tariffs in India are set by State Electricity Regulatory Commissions (SERCs) and vary significantly across states. Here are the 2026 domestic consumer rates for the major states. Note: actual bills include fixed charges, meter rent, fuel surcharges, and taxes which vary. The rates below are the per-unit energy charge for the main consumption slabs.

State-wise Domestic Electricity Tariff 2026 (Energy Charge, per unit)

Your electricity meter is the source of truth for your bill. Understanding how to read it accurately lets you catch billing errors, estimate your current month's bill before the bill arrives, and track consumption trends.

Types of Electricity Meters in India

• Electromechanical (Analog) meter: Has rotating dials. Still found in older properties. Reading requires noting the 5-digit display from left to right.
• Digital/Electronic meter: LCD display. Shows kWh reading directly. Most common in urban India today.
• Smart meter (AMR/AMI): Communicates reading automatically to the DISCOM. Being rolled out across major cities under the Smart Meter National Programme. No manual reading needed — you can also view consumption via app.

Step-by-Step: Reading an Analog Meter

1. You'll see 5 dials, each with numbers 0–9. Read from left to right.
2. If the pointer is between two numbers, note the lower number.
3. If the pointer is exactly on a number, write it down — but check the next dial to the right. If that's between 9 and 0, reduce your number by 1.
4. The 5-digit number you've read is the current meter reading in kWh.

Calculating Units Consumed

Units Consumed = Current Meter Reading − Previous Month's Reading

Example:

• Current reading: 8,430 kWh
• Previous reading (from bill): 7,850 kWh
• Units consumed = 8,430 − 7,850 = 580 units

How to Estimate Your Bill Mid-Month

Take a reading on the 15th of the month. Subtract your reading at the start of the month. Multiply by 2 to estimate full-month consumption. Apply your state's slab rates.

What Other Charges Appear on Your Bill

India uses a tiered/slab system where the price per unit increases as your consumption increases. This is why a household using 350 units doesn't pay exactly 2× what a household using 175 units pays — they're in different slabs and pay progressively more.

How Slab Billing Works — Maharashtra Example (MSEDCL 2026)

Let's say you consumed 350 units in a month in Maharashtra:

Slab Reset: Monthly vs Bimonthly Billing

Some DISCOMs (particularly in rural areas) bill every 2 months. This means 200 units billed together might push you into a higher slab than two separate 100-unit months would. If your DISCOM offers a monthly billing option, it's usually financially better to opt for it.

Rooftop solar is now one of the most financially compelling investments an Indian homeowner can make, especially with electricity rates rising every year and solar panel costs having fallen 80%+ over the last decade.

How Net Metering Works

When your solar panels generate more electricity than you're using at that moment, the excess flows back into the grid and your meter runs backward (or a bi-directional meter records it as export). At the end of the billing cycle, you pay only for the net units consumed (imported minus exported).

Net Units Billed = Total Units Imported from Grid − Total Units Exported to Grid

Solar Economics in India 2026

Is Solar Right for You?

• You own your home/terrace (rental properties are complicated)
• Monthly electricity bill is ₹2,000 or more (saves more in higher slabs)
• Your state has a net metering policy with reasonable export rate
• You have enough unshaded roof area (1 kWp needs ~10 sq ft)

Most Indian homes waste 25%–40% of their electricity through inefficiency, not ignorance. These evidence-based tips can cut your bill significantly without sacrificing comfort.

Appliance Upgrades (Biggest Impact)

Behavioral Changes (Zero Cost)

• AC temperature: Set to 24°C instead of 20°C. Each degree warmer reduces AC power consumption by 3%–6%. Going from 20°C to 24°C can cut AC electricity by 12%–24%.
• Refrigerator placement: Keep the fridge at least 10cm away from the wall and away from direct sunlight or cooking heat. Poor ventilation makes it work 15%–20% harder.
• AC maintenance: Clean your AC filter monthly. A dirty filter forces the unit to work harder — up to 25% more electricity.
• Standby power: TV, microwave, set-top boxes, phone chargers left plugged in but "off" consume phantom power (5–15W each). Plug strips with switches help.
• Washing clothes in cold water: 90% of a washing machine's electricity goes to heating water. Cold-water cycles are just as clean and save significantly.
• Run appliances at off-peak hours: Some states offer time-of-use tariffs where off-peak (night) electricity is cheaper. Check your DISCOM.

Targeted Bill Management

• Monitor your monthly units against slab boundaries — if you're close to crossing into the next slab, reduce usage for the remaining billing days
• If you have solar, prioritize daytime use of heavy appliances (geyser, washing machine, iron) to maximize self-consumption
• Check if your meter is functioning correctly — a spinning meter when all appliances are off suggests illegal draw or a faulty meter