★ EVERYDAY · APPLIANCES · COMPARISONS
The toaster saves $7.03 a year at the defaults: $7.45 for the toaster against $14.48 for the microwave. Enter your sessions per day, watts, minutes per session, and electricity price to see which one is cheaper in your kitchen. This is electricity cost only: the appliance itself is not included.
A toaster draws less power but the microwave is often assumed to be the efficient one, because it cooks fast. The yearly bill settles it: watts times minutes times sessions, priced per kilowatt-hour, for each appliance side by side.
At the defaults the toaster uses 0.06 kWh per session (1200 watts for 3 minutes) and the microwave uses 0.12 kWh per session (1400 watts for 5 minutes, rounded from 0.117 kWh). Over 730 sessions a year — 2 a day for 365 days — that is 43.80 kWh for the toaster and 85.17 kWh for the microwave, and at $0.17 per kWh the bills are $7.45 a year and $14.48 a year. The gap is $7.03 a year in the toaster's favour. Neither figure will change your life, and that is the honest headline: this comparison is about a habit, not a fortune. But the structure matters, because the same watts-times-minutes logic decides every appliance comparison, and the branches below show exactly where this one flips.
Shorten the microwave's job and the gap shrinks but does not close: a microwave used only for 3-minute reheats costs $8.69 a year (51.10 kWh) against the toaster's $7.45 a year (43.80 kWh), so the toaster still saves $1.24 a year. Lengthen the toaster's job and the gap shrinks further, but it still does not flip against the default microwave: a 5-minute bagel cycle pushes the toaster to $12.41 a year (73.00 kWh) against the microwave's $14.48 a year (85.17 kWh), so the toaster still saves $2.07 a year. That is a correction worth stating plainly, because the tempting story — long toaster cycle, microwave wins — is not what the arithmetic says at equal minutes. The genuine flip needs both changes at once: a 5-minute bagel toaster ($12.41 a year) set against a 3-minute microwave reheat ($8.69 a year), where the microwave saves $3.72 a year. In other words, minutes decide this fight, and the winner is whichever appliance does the shorter job. Frequency scales everything proportionally: 1 session a day gives toaster $3.72 a year (21.90 kWh) vs microwave $7.24 a year (42.58 kWh), a saving of $3.52, while 4 sessions a day gives toaster $14.89 a year (87.60 kWh) vs microwave $28.96 a year (170.33 kWh), a saving of $14.07. A higher price widens the dollar gap without changing the winner: at $0.30 per kWh the totals are toaster $13.14 a year (43.80 kWh) vs microwave $25.55 a year (85.17 kWh), a saving of $12.41.
Rounding convention, stated plainly: each yearly energy total is rounded to two decimals, each yearly cost is rounded to cents, and the gap is the difference of the rounded annual costs — so $14.48 minus $7.45 is exactly $7.03, and every branch figure adds up exactly as printed.
| Output | Formula | What it means |
|---|---|---|
| Toaster kWh per year | 1200 W × 3 min ÷ 60 ÷ 1000 × 730 | 43.80 kWh a year at the defaults. |
| Microwave kWh per year | 1400 W × 5 min ÷ 60 ÷ 1000 × 730 | 85.17 kWh a year at the defaults. |
| Toaster cost per year | 43.80 kWh × $0.17 | $7.45 a year at the defaults. |
| Microwave cost per year | 85.17 kWh × $0.17 | $14.48 a year at the defaults. |
| Yearly gap | Rounded microwave cost − rounded toaster cost | $14.48 − $7.45 = $7.03 a year at the defaults. |
| Bagel-cycle flip | Toaster 5 min: 73.00 kWh × $0.17 | Toaster $12.41 a year on a 5-minute cycle; the toaster still saves $2.07 a year vs the 5-minute microwave, and the true flip is bagel toaster $12.41 vs 3-minute microwave reheat $8.69, where the microwave saves $3.72 a year. |
This is an electricity model, not a meter reading. It assumes each appliance draws its rated watts for the whole session, while real appliances cycle their heaters and magnetrons, so real use is usually a little lower on both sides. It excludes the appliance purchase, and it counts only the running minutes you enter — not preheating, standby draw, or the second toaster cycle when the first comes out pale. Microwave labels are the trap here: the wattage printed big on the box is usually cooking power, while the draw from the wall is higher, so check the rating plate on the back for the draw figure this calculator needs. Enter your own label watts and timed minutes for the most accurate result.
Bright Side Kit. "Toaster vs Microwave: Yearly Energy Cost Calculator" https://brightoolbox.com/toaster-vs-microwave/ Accessed October 24, 2026.At the defaults, yes: the toaster costs $7.45 a year (43.80 kWh) against the microwave's $14.48 a year (85.17 kWh), a saving of $7.03 a year.
$7.45 a year at the defaults: 1200 watts, 3 minutes a session, 2 sessions a day, 365 days, at $0.17 per kWh, for 43.80 kWh a year.
$14.48 a year at the defaults: 1400 watts of draw, 5 minutes a session, 2 sessions a day, 365 days, at $0.17 per kWh, for 85.17 kWh a year.
When it does the shorter job: a 5-minute bagel toaster costs $12.41 a year (73.00 kWh) against a 3-minute microwave reheat at $8.69 a year (51.10 kWh), so the microwave saves $3.72 a year. A long toaster cycle alone does not flip it: at 5 minutes the toaster still saves $2.07 a year against the 5-minute microwave at $14.48 a year.
Then the toaster costs $3.72 a year (21.90 kWh) and the microwave $7.24 a year (42.58 kWh), a saving of $3.52 for the toaster.
Then the toaster costs $14.89 a year (87.60 kWh) and the microwave $28.96 a year (170.33 kWh), a saving of $14.07 for the toaster.
No: at $0.30 per kWh the toaster costs $13.14 a year and the microwave $25.55 a year, a saving of $12.41 for the toaster. The gap grows in dollars but the winner stays the same.
The appliance purchase, standby draw, preheating, and any second toaster cycle. It is running electricity cost only, at the watts and minutes you enter.