92 free calculators
8 categories
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Imperial + metric
EN 13201 + IES + ASHRAE compliant
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Core Lighting Tools
10 calculators
Room Lumens Calculator
How much light does any room need? Enter dimensions and room type.
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Lumens to Watts Converter
Convert lumens to watts for LED, CFL, halogen, and incandescent.
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Lux to Foot-Candles Converter
Convert between lux and foot-candles instantly.
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LED vs Incandescent Savings
Calculate energy and cost savings from switching to LED.
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Lighting Electricity Cost
See exactly what your lights cost per day, month, and year.
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Recessed Lighting Layout
Calculate how many recessed lights you need and where to place them.
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LED Payback Period
How long until LED upgrades pay for themselves?
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PPFD Grow Light Calculator
Calculate photosynthetic photon flux density for any grow space.
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IES File Reader
Upload and visualise IES photometric files from any luminaire.
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Lighting Units Mega-Converter
Convert between all lighting units in one place.
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Home and Interior
14 calculators
Chandelier Size Calculator
Find the right chandelier diameter for any room.
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Pendant Light Height
Ideal hang height for kitchen islands, dining tables, and bedrooms.
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Vanity Light Size Calculator
Right fixture width and mount height for any bathroom vanity.
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Kitchen Lighting Calculator
Full layered kitchen lighting plan including under-cabinet and island.
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Bedroom Lighting Calculator
Layer ambient, bedside, and wardrobe lighting for any bedroom.
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Stair Lighting Calculator
Riser lights, sconces, and LED strip for any staircase.
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Cove Lighting Calculator
LED strip length, lumen output, and lip height check for cove lighting.
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Ceiling Fixture Size Calculator
Right fixture diameter and type for any room and ceiling height.
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Home Theater Bias Lighting
SMPTE-compliant bias lighting for any screen size and room.
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Under-Cabinet Lighting
Lumens per foot and total output for under-cabinet LED strips.
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Ceiling Fan Light Kit Checker
Check if your bulbs are safe and find the right LED upgrade.
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Dimmer Load Calculator
Check if your dimmer can handle your LED load.
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Colour Temperature Selector
Choose the right CCT for every room and application.
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Natural vs Artificial Light Balance
Balance daylight and artificial lighting in any room.
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Commercial and Industrial
13 calculators
Office Lighting Calculator
EN 12464-1 compliant office lighting design with UGR check.
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Warehouse Lighting Calculator
High bay LED layout and lux levels for any warehouse.
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Retail Lighting Calculator
Accent and ambient lighting design for retail and showrooms.
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Restaurant Lighting Calculator
Layered lighting design for dining rooms, bars, and cafes.
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Hospital and Medical Lighting
Clinical lighting levels for wards, theatres, and reception areas.
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School and Classroom Lighting
Lighting design for classrooms, labs, and school common areas.
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Hotel Lobby Lighting
Layered lighting design for any hotel star rating and lobby size.
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Car Showroom Lighting
Display and accent lighting for automotive showrooms.
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Data Centre Lighting
Tier I-IV data centre lighting with PUE impact calculation.
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Cleanroom Lighting Calculator
ISO 14644-1 compliant lighting for any cleanroom classification.
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Street Lighting Calculator
EN 13201 compliant pole spacing and energy cost per km of road.
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Parking Lot Lighting
Pole spacing and lux levels for open and covered car parks.
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Emergency Egress Lighting
Emergency lighting compliance for escape routes and open areas.
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Energy and Savings
7 calculators
Smart Lighting Savings
How much can smart controls save on your lighting bill?
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Occupancy Sensor Savings
Calculate energy savings from adding motion and occupancy sensors.
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Lighting Carbon Footprint
Calculate CO2 emissions from your lighting installation.
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Daylight Harvesting Savings
Savings from dimming lights in response to natural daylight.
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Utility Rebate Estimator
Estimate available utility rebates for LED lighting upgrades.
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Solar Lighting ROI
Return on investment for solar-powered outdoor lighting systems.
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Lighting Upgrade NPV
Net present value analysis for commercial lighting upgrades.
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Electrical and Contractor
14 calculators
Voltage Drop Calculator
Calculate voltage drop over any cable run for lighting circuits.
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Circuit Load Calculator
Check your lighting circuit load against breaker ratings.
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Wire Gauge Calculator
Select the right wire gauge for any lighting circuit load.
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LED Driver Calculator
Size the right LED driver for any constant current or voltage load.
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Constant Current Driver
Design LED arrays with series/parallel strings and verify voltage window.
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Constant Voltage LED Strip
Power, voltage drop, and injection points for LED strip installations.
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Emergency Lighting Compliance
BS 5266 emergency lighting compliance calculator.
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LED Retrofit ROI Calculator
Full ROI analysis for commercial LED retrofit projects.
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Lighting Power Density (LPD)
Calculate W/m2 and check against ASHRAE and energy code limits.
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Short Circuit Current
Calculate prospective short circuit current for lighting circuits.
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Transformer Sizing Calculator
Size a transformer for any low voltage lighting system.
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Lighting Control Zone
Plan lighting control zones for DALI and switched systems.
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Panel Schedule Calculator
Create a panel schedule for lighting distribution boards.
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Junction Box Fill Calculator
Calculate maximum conductor fill for junction and outlet boxes.
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Photography and Video
10 calculators
Studio Flash Power
Find the right flash power for subject distance and aperture.
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Lighting Ratio Calculator
Calculate key-to-fill lighting ratios for portrait photography.
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Video Lighting Calculator
Calculate lux requirements for film and video production.
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Gel and Colour Filter Calculator
Colour correction gels for mixing tungsten and daylight sources.
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Softbox Coverage Calculator
Coverage area and light quality for any softbox size and distance.
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Exposure Value (EV) Calculator
Calculate EV from ISO, aperture, and shutter speed.
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Hyperfocal Distance Calculator
Hyperfocal distance for any lens, aperture, and sensor format.
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CRI and TLCI Calculator
Colour rendering quality for photography and broadcast lighting.
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LED Video Panel Comparison
Compare LED video panels by pixel pitch, resolution, and brightness.
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White Balance Calculator
Set accurate white balance for any mixed lighting scenario.
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Grow Lights
8 calculators
DLI Calculator
Daily light integral for any plant, grow stage, and PPFD level.
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Grow Tent Sizing Calculator
Find the right tent size and light wattage for your plant count.
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Greenhouse Lighting Calculator
Supplemental lighting requirements for any greenhouse and crop.
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COB vs Quantum Board
Compare COB and quantum board grow lights for any space.
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Grow Light Heat Output
Calculate heat load from grow lights for HVAC sizing.
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Plant Stage Light Hours
Photoperiod hours for seedling, veg, and flowering stages.
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VPD Calculator
Vapour pressure deficit for optimal grow room climate control.
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Grow Light Yield Estimator
Estimate harvest yield from your grow light and canopy area.
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Stage, Outdoor and Landscape
10 calculators
Beam Angle Calculator
Coverage diameter at any distance for any beam angle.
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DMX Address Calculator
Calculate DMX start addresses for any number of fixtures.
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Landscape Lighting Calculator
Path lights, uplights, and coverage for outdoor landscape projects.
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String Lights Calculator
Length, bulb spacing, and power for outdoor string lights.
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Stage Wash Coverage
Coverage area and overlap for stage wash and flood lighting.
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Gobo Projection Calculator
Projected image size and throw ratio for gobo projectors.
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Flood Light Coverage
Coverage area and lux levels for outdoor flood lighting.
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Moving Head Pan/Tilt
Pan and tilt angles for moving head fixtures on any stage.
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Outdoor LED Strip
IP-rated LED strip for outdoor steps, decks, and garden features.
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Parking Area Lighting
Pole spacing and lux uniformity for parking lots and open areas.
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Unit Converters
6 converters
Lumens to Lux Converter
Convert lumens to lux for any area and beam angle.
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Candela to Lumens Converter
Convert between candela (intensity) and lumens (flux).
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Lux to PPFD Converter
Convert lux readings to PPFD for grow light applications.
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Kelvin Colour Temperature Guide
Interactive guide to choosing the right Kelvin for any application.
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Foot-Candles to Lux
Instant foot-candles to lux conversion with reference table.
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Lighting Units Mega-Converter
Convert between all lighting units in one place.
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More calculators coming soon
We’re building toward 124 free lighting calculators. New tools added regularly.
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