Free professional lighting calculators for electricians, designers and DIYers

100% Free No sign-up Australian standards ๐Ÿ‡บ๐Ÿ‡ธ US ยท ๐Ÿ‡ฎ๐Ÿ‡ณ India ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ South Africa Works on mobile
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The Tools
Five calculators. All free. No fluff.

Built by lighting industry professionals for real-world use. Get instant, accurate results โ€” no login, no paywall.

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LED Strip Driver Calculator
Find the right power supply for any LED strip installation
  • Sizes driver wattage with 20% safety buffer
  • Supports 12V, 24V and 48V systems
  • Voltage drop warning for runs over 5m
  • Recommends standard driver sizes up to 500W
  • Amazon buy links for quick procurement
Open Calculator โ†’
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LED Strip Light Selector
Answer a few questions โ€” get the right strip type instantly
  • 12 application types from cove to pool
  • IP rating and CCT recommendations
  • Covers SMD, COB and neon silicone strips
  • Honest dotty-dot advice with channel solutions
  • Pool & spa safety guidance built in
Open Selector โ†’
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Lux Calculator
Calculate lighting levels for any space or fitting type
  • 4 modes: downlight, room grid, panel, reverse
  • Glare risk guide with practical advice
  • UGR reference table (AS/NZS 1680)
  • Lux gauge with colour-coded result
  • Beam cone diagram and lux meter buy links
Open Calculator โ†’
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Garden Lighting Calculator
Voltage drop, cable sizing and wiring layout for outdoor LED systems
  • 12V and 24V system voltage drop calculation
  • ๐Ÿ‡ฆ๐Ÿ‡บ AU ยท ๐Ÿ‡บ๐Ÿ‡ธ US ยท ๐Ÿ‡ฎ๐Ÿ‡ณ India ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ South Africa region modes
  • mmยฒ and AWG cable sizes with local standards
  • Daisy-chain vs home-run wiring recommendation
  • Driver sizing with MeanWell model suggestions
Open Calculator โ†’
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Voltage Drop Calculator
Full electrical voltage drop โ€” single phase, three phase, DC, series runs & motor starting
  • 5 modes: 1-phase, 3-phase, DC, series runs, motor starting
  • ๐Ÿ‡ฆ๐Ÿ‡บ AU ยท ๐Ÿ‡บ๐Ÿ‡ธ US ยท ๐Ÿ‡ฎ๐Ÿ‡ณ India ยท ๐Ÿ‡ฟ๐Ÿ‡ฆ South Africa region modes
  • Ampacity checker with pass/fail result
  • Cable comparison table across all common sizes
  • Worked examples, FAQ & Print/PDF function
Open Calculator โ†’
Why LightTools
Built by people who actually use these tools
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Multi-Region Support
Built for Australia (AS/NZS 3000), USA (NEC/AWG), India (IS 732) and South Africa (SANS 10142). Switch regions instantly in the Garden Lighting Calculator.
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Real Formulas
Not guesswork. Voltage drop uses the copper resistivity formula (ฯ = 0.0175 ฮฉยทmmยฒ/m). Lux uses photometric point and zonal calculations.
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Works on Site
Fully mobile-optimised. Use it on your phone in the field โ€” no app to download, no login, no data stored.
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No Sign-Up Ever
Free, forever. No account, no email, no subscription. Just open a calculator and use it.
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Find Products Fast
Results include Amazon AU, Amazon US, Amazon India and Takealot (South Africa) product links so you can source drivers, cable and fittings without leaving the page.
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Educational
Every result includes the formula used and plain-English explanations, so you understand the why โ€” not just the number.
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These tools are free reference guides only โ€” not a substitute for professional electrical advice. All installation work must be carried out by a licensed electrician. Read full disclaimer โ†’