Electricity Savings Calculator
Calculate how much you can save on electricity by replacing old appliances or reducing usage.
Compare Two Appliances / Settings
Old Appliance
New Appliance
About this calculator
Compare an old appliance with a new, efficient one: enter watts, hours per day and days per year for each, plus your tariff, and see the yearly savings in units and rupees.
Use it to decide if a 5-star AC, LED bulbs or an inverter fridge pays back.
How to use it
- Enter the old and new watts.
- Set hours per day and days per year.
- Enter your rate per unit and press Calculate Savings.
Savings formula
Annual units saved = (old W − new W) × hours × days ÷ 1000. Money saved = units saved × rate. Payback time = extra cost of the efficient appliance ÷ yearly saving. Example: replacing a 60 W bulb with a 9 W LED for 8 hours a day over 180 days saves 51 × 8 × 180 ÷ 1000 = 73.4 units, which is ₹440 at ₹6 per unit.
Worked example
1.5 ton AC: old 1800 W vs inverter 1200 W, 8 h/day, 180 days
| Units saved | 600 × 8 × 180 ÷ 1000 = 864 |
| At ₹6 per unit | ₹5,184 a year |
Tips and common mistakes
- Include the purchase cost and calculate payback.
- Star ratings are relative to size and are tested at standard conditions.
- A good tariff estimate includes fixed charges separately.
- Savings also depend on real usage hours.
- Consider rebates and exchange offers.
Frequently asked questions
How do I calculate electricity savings?
Watts saved × hours × days ÷ 1000 × rate.
Is LED really cheaper?
Yes, about 80% less power than incandescent.
What is payback period?
Extra cost ÷ yearly savings.
Do 5-star ACs save much?
Yes, typically 20 to 40% versus older units.
Do savings change with tariff?
Yes, higher rates make savings bigger.
Is it free?
Yes.