yCalculator

Smart Meter Savings Calculator

Last updated: April 2026

Current electricity use

Target tariff

What can you shift off-peak?

Shiftable usage: 15%

Total saving

£98/year

New annual bill

£902

Saving

9.8%

Saving breakdown

Behaviour change (3.5%)
£35.00
Tariff optimisation
£62.77
EV off-peak charging
£0.00
Storage heating
£0.00
Total saving
£97.77

Hourly cost comparison

Current rate
24.5p/kWh all day
Octopus Go off-peak
9p/kWh (4hrs/day)
Octopus Go peak
24.5p/kWh

Best times to run appliances on Octopus Go

Washing machine

00:30-04:30

Dishwasher

00:30-04:30

EV charging

00:30-04:30

Smart meter note

Smart meters are free to install and required to access time-of-use tariffs. Your supplier is obliged to offer you one on request.

What is a time-of-use tariff?

A time-of-use tariff charges different electricity rates depending on when you use it. Off-peak periods are usually cheaper, so moving flexible use such as laundry, dishwashers, and EV charging overnight can reduce bills.

What is Octopus Go?

Octopus Go is a time-of-use electricity tariff with a low overnight rate, currently around 9p/kWh, between 00:30 and 04:30. It is especially useful for EV owners who can charge overnight.

Do smart meters save money?

Smart meters do not directly reduce bills, but they make usage visible and enable time-of-use tariffs. Studies show this can reduce consumption by around 3-4%, with larger savings for flexible usage or EV charging.

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

Related Energy calculators

energy home-calculators

Energy Bill Calculator

Calculate your estimated gas and electricity bill based on your usage and current rates

Calculate →

energy home-calculators

Electricity Cost Calculator

Calculate the running cost of any electrical appliance per hour, day, month and year

Calculate →

energy home-calculators

Solar Panel Payback Calculator

Calculate how long solar panels take to pay back their cost and your lifetime savings

Calculate →

You might also need

energy home-calculators

Electricity Cost Calculator

Calculate the running cost of any electrical appliance per hour, day, month and year

Calculate →

energy home-calculators

Energy Direct Debit Calculator

Check if your energy direct debit is correct and calculate the right amount to avoid debt or credit

Calculate →

energy home-calculators

Home Energy Audit Calculator

Identify where your home loses energy and calculate the savings from common improvements

Calculate →