LED Strip Calculator

Size your power supply and plan LED strip installation

Power Supply

90W

Amps

7.5A

$/Month

$1.52

Length (feet)

Hours/Day

$/kWh

Power Supply Needed

90W

7.5A @ 12V

Watts

70

Lumens

4389

Runs

1

Running Cost

Daily Energy0.42 kWh

Monthly Cost$1.52

What You'll Need

DAYBETTER LED Strip Lights 110ft, Smart Lighting Strips with App Remote Control, RGB Music Sync Color Changing Lights for Bedroom Kitchen Party Home Decor Luces led para cuarto (1 Roll)

DAYBETTER LED Strip Lights 110ft, Smart Lighting Strips with App Remote Control, RGB Music Sync Color Changing Lights for Bedroom Kitchen Party Home Decor Luces led para cuarto (1 Roll)

ALITOVE DC 12V 5A Power Supply Adapter Converter Transformer 60W AC 100-240V Input with 5.5x2.5mm DC Output Jack for 5050 3528 LED Strip Module Light

ALITOVE DC 12V 5A Power Supply Adapter Converter Transformer 60W AC 100-240V Input with 5.5x2.5mm DC Output Jack for 5050 3528 LED Strip Module Light

JACKYLED 20Packs L Shape 4-Pin LED Connectors with 22Pcs Clips 10mm for Strip Lights - 10mm 4pin

JACKYLED 20Packs L Shape 4-Pin LED Connectors with 22Pcs Clips 10mm for Strip Lights - 10mm 4pin

DAYBETTER LED Strip Lights 110ft, Smart Lighting Strips with App Remote Control, RGB Music Sync Color Changing Lights for Bedroom Kitchen Party Home Decor Luces led para cuarto (1 Roll)

DAYBETTER LED Strip Lights 110ft, Smart Lighting Strips with App Remote Control, RGB Music Sync Color Changing Lights for Bedroom Kitchen Party Home Decor Luces led para cuarto (1 Roll)

ALITOVE DC 12V 5A Power Supply Adapter Converter Transformer 60W AC 100-240V Input with 5.5x2.5mm DC Output Jack for 5050 3528 LED Strip Module Light

ALITOVE DC 12V 5A Power Supply Adapter Converter Transformer 60W AC 100-240V Input with 5.5x2.5mm DC Output Jack for 5050 3528 LED Strip Module Light

JACKYLED 20Packs L Shape 4-Pin LED Connectors with 22Pcs Clips 10mm for Strip Lights - 10mm 4pin

JACKYLED 20Packs L Shape 4-Pin LED Connectors with 22Pcs Clips 10mm for Strip Lights - 10mm 4pin

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Price as of Jun 27, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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Example Calculations

116 ft SMD 5050 under-cabinet strip

Inputs

Length16 ft (4.88m)

TypeSMD 5050 (14.4W/m)

Voltage12V

Usage6 hours/day

Result

Power Supply90W

Amps7.5A @ 12V

Monthly Cost$0.76

4.88m × 14.4W = 70.3W. ×1.2 = 84.3W. Round to 90W PSU. Cost: 0.070 × 6 × 30 × 0.12 = $1.51.

232 ft COB strip for cove lighting

Inputs

Length32 ft (9.75m)

TypeCOB (10W/m)

Voltage24V

Usage4 hours/day

Result

Power Supply120W

Amps5A @ 24V

Monthly Cost$1.40

9.75m × 10W = 97.5W. ×1.2 = 117W. Round to 120W PSU. Monthly: 0.098 × 4 × 30 × 0.12 = $1.41.

Show all examples

Frequently Asked Questions

Q

What size power supply do I need for LED strips?

Add up total watts (strip wattage/meter × length in meters), then add 20% headroom. A 5m strip of SMD 5050 at 14.4W/m needs 72W, so buy a 90W power supply.

Calculate total watts: W/m × total meters
Add 20% headroom: multiply by 1.2
Round up to next standard PSU size
Never run a power supply at 100% capacity

Strip Type	Watts/Meter	5m Total	PSU Size
SMD 2835	4.8W	24W	30W
SMD 5050	14.4W	72W	90W
SMD 5630	18W	90W	120W
COB	10W	50W	60W

Q

Should I use 12V or 24V LED strips?

24V strips allow longer runs with less voltage drop. Use 12V for short runs under 5m and 24V for anything longer. Both produce the same light output.

12V: max 5m per run, cheaper controllers
24V: max 10m per run, less voltage drop
12V strips are more common and cheaper
24V preferred for professional installations

Q

How much does it cost to run LED strips?

LED strips are very efficient. A 16-foot SMD 5050 strip draws about 70W and costs $0.50–$0.60/month running 6 hours/day at $0.12/kWh.

5m SMD 5050: 72W = $0.78/month at 6h/day
5m SMD 2835: 24W = $0.26/month at 6h/day
5m COB strip: 50W = $0.54/month at 6h/day
Much cheaper than traditional light fixtures

Q

How do I avoid voltage drop in LED strips?

Never exceed 5m per run for 12V strips or 10m for 24V. For longer installations, inject power at both ends or use parallel runs from the power supply.

Voltage drop causes dimming at the far end
12V: inject power every 5m
24V: inject power every 10m
Use thicker wire (18 AWG+) for long cable runs

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Last Updated: Jul 13, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.