The short answer
Price an electric blanket using average input watts at each setting and its actual hours, or measured kWh across complete use days. Separate preheating from lower settings. The cost describes heated bedding on that routine; it does not establish equivalent comfort or savings against heating a room.
Use the electric blankets calculatorOn this page
A rating is not the draw at every heat setting
An electrical input rating helps identify a product’s maximum demand, but it does not show how often a thermostat supplies power. Use an appropriate average for the selected setting or a representative electricity measurement. Do not apply an invented cycling percentage to every blanket.
The blanket calculator supports separate daily modes and complete-day measured kWh. Its starting fields contain no appliance readings. The optional example supplies assumptions so you can inspect the arithmetic.
Separate preheating, use and standby
Consider these illustrative values, not manufacturer settings or a recommended overnight routine:
| Mode | Average input | Time per use day | Energy |
|---|---|---|---|
| Preheat | 100 W | 0.5 hours | 0.05 kWh |
| Selected lower setting | 40 W | 4 hours | 0.16 kWh |
| Standby | 0.3 W | 19.5 hours | 0.00585 kWh |
The periods total 24 hours, and energy totals 0.21585 kWh per use day. Across 90 use days at an assumed $0.20/kWh, electricity costs $3.8853, displayed as $3.89. If the standby period does not occur on those days, replace its input rather than treating it as an unavoidable property of every model.
Measured mode already includes captured cycling
A complete measurement should cover the preheat and the normal use routine, with the starting and ending meter readings recorded. Divide accumulated kWh by the number of complete representative use days. Record a change in setting or schedule rather than silently combining different routines.
If a sample covers three complete use days and accumulates 0.6 kWh, its observed average is 0.2 kWh/use day. Applying it to 90 days at $0.20/kWh produces a $3.60 scenario. The sample and the seasonal projection are separate quantities. Those numbers are invented arithmetic inputs, not a Watt & Home test.
Count the right units and season
The quantity control assumes identical appliances following the same routine. A double blanket may contain separate controls; check whether your reading covers one side, both sides or the whole supply. Do not multiply a whole-device measurement by two merely because the bed has two occupants.
Seasonal use days should describe how often that routine happens. If a controller consumes electricity on non-use days, price that separate period too. The calculator does not automatically add a second off-season schedule.
Compare comfort and follow the product instructions
Personal warming and space heating serve different purposes. Subtracting a blanket cost from a full room-heater cost does not establish a saving unless the room-heating routine actually changes and the comparison remains appropriate.
Follow the manufacturer’s intended use, permitted timer and condition checks. Electrical Safety First advises checking blankets for damage and using them according to their instructions. A cost example is not permission to use an unsuitable blanket through the night.
Keep the model, settings and meter boundary in the journal. Compare repeated samples with similar conditions before drawing conclusions about a routine change.
Average unequal samples by their completed days
As an invented averaging example, a three-day sample uses 0.6 kWh and a seven-day sample uses 2.1 kWh. Their combined average is (0.6 + 2.1) ÷ (3 + 7) = 0.27 kWh/day. Averaging the two sample rates, 0.2 and 0.3, would give 0.25 and put too much weight on the shorter sample.
A 90-day scenario at $0.20/kWh using the weighted 0.27 average costs $4.86. It is not a measured season. The journal retains the counters and complete counts so you can compare the samples and conditions before projecting them.
Keep permitted use separate from an arithmetic fixture
An example’s preheat and operating hours do not override the product instructions. Record the actual model and controller, inspect the condition as advised by Electrical Safety First, and use only the routine permitted for that product. A cost estimate cannot establish overnight suitability or equivalent comfort to heating a whole room.