💇 Personal Care
How Many kWh Does a Hair Straightener / Flat Iron Use?
Hair Straightener / Flat Iron energy cost calculator — see your exact daily, monthly, and yearly electricity cost.
Rate — MAY 2026
⚡ 150W typical
$
US national average. Edit for your local rate.
Daily Energy Use
0.04
kWh / day
Monthly Cost
$0.21
Yearly Cost
$2.52
Hair Straightener / Flat Iron — Cost Breakdown
| Period | kWh Used | Cost ($) |
|---|---|---|
| Per Hour | 0.1500 | $0.0277 |
| Per Day | 0.04 | $0.01 |
| Per Month (30 days) | 1.13 | $0.21 |
| Per Year (365 days) | 13.69 | $2.52 |
⚡ Real-World Comparison
Straightening hair for 15 minutes uses about the same energy as running a laptop for 45 minutes.
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3 Ways to Cut Your Hair Straightener / Flat Iron Energy Bill
- 🌱
Use the auto-shutoff feature — forgotten flat irons can waste energy for 30–60 minutes.
- 💡
Use the lowest effective temperature for your hair type — 300°F for fine hair, 400°F only for coarse hair.
- ⚡
Dry hair completely before straightening — water in the hair absorbs heat and forces multiple slower passes.
Startup Surge Information
Flat irons use ceramic or tourmaline resistance heaters with no motor, drawing stable wattage with no startup surge.
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