Enter the total lumens (L) into the Nits from Lumens Calculator. The calculator will evaluate the Nits from Lumens.
AssumptionsRead first
- Exactly one field must be provided.
- Unit handling is linear: k lm = 1000 lm, fL = 3.426 cd/m².
- Core relation: Nits = Lumens / 3.426 and Lumens = Nits x 3.426.
- Physical context (area, beam angle, optical losses, screen gain) is not modeled.
- Outputs shown to 4 decimal places.
When to Use
- Quick mapping between lumens and nits (cd/m²).
- Converting between nits and foot-lamberts (fL).
- Not for projector sizing or optical engineering.
Input Definitions
- Total Lumens (L): Luminous flux. Units: lm, k lm.
- Nits (cd/m²): Luminance. Units: cd/m², fL (1 fL = 3.426 cd/m²).
- Enter one value; leave the other empty to compute it.
| Lumens (lm) to Nits (cd/m²) | Nits (cd/m²) to Lumens (lm) |
|---|---|
| 500 lm = 145.97 cd/m² | 50 cd/m² = 171.3 lm |
| 700 lm = 204.37 cd/m² | 80 cd/m² = 274.08 lm |
| 1,000 lm = 291.95 cd/m² | 100 cd/m² = 342.6 lm |
| 1,500 lm = 437.92 cd/m² | 120 cd/m² = 411.12 lm |
| 2,000 lm = 583.89 cd/m² | 150 cd/m² = 513.9 lm |
| 2,500 lm = 729.87 cd/m² | 200 cd/m² = 685.2 lm |
| 3,000 lm = 875.84 cd/m² | 250 cd/m² = 856.5 lm |
| 3,500 lm = 1,021.81 cd/m² | 300 cd/m² = 1,027.8 lm |
| 4,000 lm = 1,167.79 cd/m² | 400 cd/m² = 1,370.4 lm |
| 4,500 lm = 1,313.76 cd/m² | 500 cd/m² = 1,713 lm |
| 5,000 lm = 1,459.73 cd/m² | 600 cd/m² = 2,055.6 lm |
| 6,000 lm = 1,751.68 cd/m² | 800 cd/m² = 2,740.8 lm |
| 7,000 lm = 2,043.63 cd/m² | 1,000 cd/m² = 3,426 lm |
| 8,000 lm = 2,335.58 cd/m² | 1,200 cd/m² = 4,111.2 lm |
| 10,000 lm = 2,919.47 cd/m² | 1,500 cd/m² = 5,139 lm |
| 12,000 lm = 3,503.36 cd/m² | 2,000 cd/m² = 6,852 lm |
| 15,000 lm = 4,379.20 cd/m² | 2,500 cd/m² = 8,565 lm |
| 20,000 lm = 5,838.93 cd/m² | 3,000 cd/m² = 10,278 lm |
| 25,000 lm = 7,298.66 cd/m² | 4,000 cd/m² = 13,704 lm |
| 30,000 lm = 8,758.40 cd/m² | 5,000 cd/m² = 17,130 lm |
| Formulas: nits = lumens / 3.426 and lumens = nits x 3.426. | |
| Foot-Lamberts (fL) to Nits | Nits to Foot-Lamberts (fL) |
|---|---|
| 10 fL = 34.26 cd/m² | 100 cd/m² = 29.19 fL |
| 14 fL = 47.96 cd/m² | 200 cd/m² = 58.39 fL |
| 16 fL = 54.82 cd/m² | 300 cd/m² = 87.58 fL |
| 30 fL = 102.78 cd/m² | 500 cd/m² = 145.97 fL |
| 50 fL = 171.3 cd/m² | 1,000 cd/m² = 291.95 fL |
| Formulas: cd/m² = fL x 3.426 and fL = cd/m² / 3.426. | |
- All Unit Converters
- Waves, Optics, and Quantum Unit Converters
- Candlepower to Lumens Calculator
- Lumens Distance Calculator
Nits from Lumens Formula
N = L / 3.426
Variables:
- N is the luminance in nits (cd/m²)
- L is the total luminous flux in lumens (lm)
The constant 3.426 originates from the relationship between foot-lamberts and candelas per square meter. One foot-lambert equals exactly 1/pi candela per square foot, which converts to 3.42625909 cd/m² when expressed in SI units. This calculator uses the rounded value of 3.426 for the direct mapping between lumens and nits, treating the source as a uniform Lambertian emitter over one steradian of solid angle.
What Nits and Lumens Actually Measure
Lumens and nits quantify different physical properties of light. A lumen (lm) is the SI unit of luminous flux, representing the total visible light emitted by a source in all directions. A nit, equivalent to one candela per square meter (cd/m²), measures luminance: the intensity of light emitted from a specific surface area into a specific solid angle. The term “nit” comes from the Latin “nitere” (to shine) and, while not an official SI unit name, is universally used in the display industry.
Because these units describe different quantities, a direct conversion requires assumptions about the emitting geometry. The simplified formula above assumes a point source radiating into one steradian. For real-world engineering (projector throw calculations, screen gain modeling, optical system design), you must account for emitting area, beam angle, reflectance, and optical losses. This calculator is intended for quick estimation and educational reference, not optical engineering.
Photometric Unit Hierarchy
The four core photometric units form a hierarchy based on how light is measured:
| Quantity | Unit | Symbol | What It Measures |
|---|---|---|---|
| Luminous intensity | Candela | cd | Light power per solid angle from a point source |
| Luminous flux | Lumen | lm | Total visible light output (1 lm = 1 cd x 1 sr) |
| Illuminance | Lux | lx | Light arriving at a surface (1 lx = 1 lm/m²) |
| Luminance | Nit (cd/m²) | nt | Light emitted per unit area per solid angle |
Lumens tell you how much total light leaves a source. Nits tell you how bright a surface appears to the eye from a given viewing angle. A 1,000-lumen projector and a 1,000-nit display are not comparable without knowing the projection area and viewing geometry.
Device Brightness Reference (Nits)
| Device Type | Typical Range (nits) | Notes |
|---|---|---|
| E-reader (e-ink) | 15 to 30 | Reflective display, relies on ambient light |
| Budget laptop LCD | 200 to 300 | Adequate for indoor office use only |
| Standard desktop monitor | 300 to 400 | Covers most indoor productivity tasks |
| Premium laptop (MacBook Pro) | 500 to 1,600 | XDR displays reach 1,600 nits peak HDR |
| Flagship smartphone | 1,000 to 3,000 | iPhone 16 Pro peaks near 2,000; Galaxy S25 Ultra near 3,000 |
| HDR television (LCD) | 600 to 2,000 | Mini-LED backlit sets reach the upper range |
| HDR television (OLED) | 800 to 2,100 | QD-OLED and MLA panels push past 1,500 |
| Professional reference monitor | 1,000 to 4,000 | Used in color grading and broadcast mastering |
| Outdoor digital signage | 2,500 to 7,000 | Must overcome direct sunlight glare |
| Outdoor LED video wall | 5,000 to 10,000+ | Stadium and billboard applications |
VESA DisplayHDR Certification Tiers
VESA’s DisplayHDR standard certifies monitors at specific brightness thresholds. These tiers are useful for understanding what nit values mean in practice when shopping for HDR displays:
| Tier | Min Peak Brightness | Typical Use |
|---|---|---|
| DisplayHDR 400 | 400 nits | Entry-level HDR; marginal improvement over SDR |
| DisplayHDR 500 | 500 nits | Noticeable HDR effect for gaming and general use |
| DisplayHDR 600 | 600 nits | Good HDR for content consumption and creative work |
| DisplayHDR 1000 | 1,000 nits | Professional HDR, strong specular highlights |
| DisplayHDR 1400 | 1,400 nits | High-end professional mastering and grading |
For OLED and emissive displays, VESA uses the DisplayHDR True Black standard with tiers at 400, 500, 600, and 1,000 nits. The “True Black” designation requires a black level of 0.0005 cd/m² or less, giving these panels contrast ratios exceeding 1,000,000:1.
Brightness Requirements by Environment
| Environment | Ambient Light (lux) | Minimum Nits |
|---|---|---|
| Dark room / home theater | less than 50 lux | 100 to 200 |
| Dim office / living room | 50 to 300 lux | 250 to 400 |
| Bright office / retail space | 300 to 750 lux | 400 to 700 |
| Covered outdoor (shade) | 1,000 to 5,000 lux | 700 to 1,500 |
| Direct sunlight | 10,000 to 100,000 lux | 2,500+ |
These are practical minimums for maintaining readable contrast. A display viewed in direct sunlight with only 500 nits will appear washed out regardless of its contrast ratio or color accuracy. Sunlight-readable signage and kiosk displays typically start at 2,500 nits and use anti-reflective coatings and optical bonding to further improve visibility.
How to Calculate Nits from Lumens
- Determine the total luminous flux of the source in lumens (lm). For a projector, this is the ANSI lumens rating on the spec sheet. For an LED source, use the rated lumen output.
- Apply the formula: N = L / 3.426, where L is the lumen value. This gives you luminance in nits (cd/m²) under the simplified Lambertian assumption.
- If you need the result in foot-lamberts instead of nits, divide the nit value by 3.426 (since 1 fL = 3.426 cd/m²).
- Verify your result with the calculator above. For example, 1,000 lumens yields approximately 291.9 nits.
Example: A conference room projector is rated at 3,500 ANSI lumens. Using the formula: N = 3,500 / 3.426 = 1,021.6 nits. This represents the theoretical luminance assuming the entire flux is concentrated over one steradian. In practice, the actual screen luminance will be lower because the light spreads across the projection area and is affected by screen gain, ambient light, and optical path losses.
