Economy 7 Savings Calculator
Instantly work out how much you could save (or lose) by switching to an Economy 7 electricity tariff, based on your annual usage and how much of it happens overnight.
Calculate Your Economy 7 Savings
Enter your usage and tariff rates below to compare Economy 7 against a standard single-rate tariff and see your estimated annual savings.
Economy 7 Calculator
Enter your details to see if Economy 7 is worth it
3,100 kWh is the UK average for a medium household
Higher with storage heaters, EV charging, or immersion timers
Estimated Savings
Economy 7 versus standard single-rate tariff
Typical UK Household Usage & Rates
Typical annual electricity usage bands and how Economy 7 tends to perform against a standard tariff.
| Household Size | Typical Annual Usage | Night Usage Needed to Break Even | Economy 7 Suitability |
|---|---|---|---|
| Low (1-2 people) | 1,800 kWh | ~35-40% | Often not worth it without night appliances |
| Medium (2-3 people) | 3,100 kWh | ~30-35% | Worth it with an EV or storage heaters |
| High (4+ people) | 4,600 kWh | ~30-35% | Often beneficial with off-peak habits |
Economy 7 FAQ
Everything you need to know about whether Economy 7 could save you money.
Economy 7 is an electricity tariff that offers a cheaper unit rate for 7 hours overnight, typically between midnight and 7am, in exchange for a higher rate during the remaining 17 daytime hours. It requires a compatible meter that records day and night usage separately.
As a general rule of thumb, you typically need at least 30 to 40 percent of your total electricity usage to happen during the overnight window for Economy 7 to work out cheaper than a standard single-rate tariff, though this depends on the exact day and night rates offered.
Yes, Economy 7 requires a meter that can record electricity usage separately for day and night periods, such as a dual-rate meter or a smart meter configured for Economy 7. Your energy supplier can arrange installation if you don’t already have one.
Economy 7 is often worth it for households with electric vehicles, storage heaters, or immersion heaters that can be scheduled to run overnight, since these appliances can shift a large share of usage into the cheaper night rate window.