UV Resin Cure Calculator
Estimate the UV cure time for resin layers based on thickness, lamp wattage, distance, and resin clarity.
About this calculator
This calculator estimates UV resin cure time by scaling a reference case — 60 seconds to cure a 1mm layer of clear resin under a 36W lamp held 2 inches away — across four factors that each independently push cure time up or down. Thickness has the strongest effect: cure time scales with thickness raised to the 1.8 power, reflecting that UV light attenuates as it passes into the resin, so doubling thickness more than doubles the time needed to cure all the way through, not just the surface. Lamp wattage scales inversely and linearly (36 ÷ your wattage), so a 72W lamp roughly halves cure time relative to the 36W reference, all else equal.
Distance from the lamp matters too: intensity falls off with distance, modeled here as (distance ÷ 2 inches) raised to the 1.5 power, meaning moving the lamp twice as far away costs meaningfully more than double the time. Pigments and dyes block UV transmission, so clarity carries its own multiplier — 1.0× for clear, 1.5× for tinted or translucent, 2.5× for opaque or heavy pigment — and the calculator separately warns when your layer thickness exceeds what's realistically curable for that clarity (as low as 1mm for opaque resin), since UV cure only works where light actually penetrates. The biggest practical risk this tool flags but can't fully prevent: a layer can look tack-free on the surface while remaining uncured underneath, especially in pigmented resin, so when in doubt cure longer and in thinner layers rather than trusting a single estimated time.
Inputs
Results
Cure Time
60 seconds
How to Use This Calculator
- Enter the layer thickness in millimeters — UV resin is typically applied in thin layers (0.5–3 mm).
- Enter your UV lamp wattage (36 W nail lamp vs. 48–100 W professional curing lamp make a significant difference).
- Enter the distance from the lamp to the resin surface in inches.
- Select the resin clarity: clear (1.0×), tinted/translucent (1.5×), or opaque/heavy pigment (2.5×).
- Read the cure time in seconds and minutes, along with the depth check warning if your layer exceeds the recommended maximum thickness for that clarity.
- If the cure time seems long, reduce layer thickness or move the lamp closer to the resin surface.
How the result changes with Layer Thickness
| Layer Thickness | Cure Time |
|---|---|
| 0.5 | 17 seconds |
| 0.75 | 36 seconds |
| 1.5 | 124 seconds |
| 2.5 | 312 seconds |
What each input means
- Layer Thickness
- Thickness of the resin layer in millimeters. UV resin cures from the surface down; thicker layers need more time. Max 3-4mm for clear resin.
- UV Lamp Wattage
- Wattage of your UV lamp. Common sizes: 6W (pen light), 36W (nail lamp), 48-100W (professional curing lamp).
- Lamp Distance
- Distance from the UV lamp to the resin surface. Closer = faster cure. Most nail lamps are 1-2 inches away.
- Resin Clarity
- Pigments and dyes block UV light, requiring longer exposure. Opaque resin may not cure at depths beyond 1mm.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersLayer Thickness = 1, UV Lamp Wattage = 36, Lamp Distance = 2, Resin Clarity = 1 = 4 input(s) provided
- Calculate Cure TimeCure Time60 = 60
- Calculate Cure TimeCure Time1 = 1
- Calculate Resin ClarityResin Clarity = clarity.labelClear = Clear
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does doubling layer thickness more than double the cure time?
Cure time scales with thickness raised to the 1.8 power, not linearly, because UV light attenuates as it travels deeper into resin — the surface cures quickly while light reaching the bottom of a thick layer is already weaker. So a 2mm layer takes noticeably more than twice as long to cure through as a 1mm layer under otherwise identical conditions.
Will moving my lamp twice as close really cut cure time in half?
No — the distance factor is (distance ÷ 2 inches) raised to the 1.5 power, so it's a steeper-than-linear relationship. Moving the lamp from 4 inches to 2 inches away cuts the distance factor by more than half, meaning small changes in lamp distance have an outsized effect on cure time compared to what a simple inverse relationship would predict.
Why does the calculator cap the maximum recommended thickness so much lower for opaque resin?
Pigments and dyes block UV transmission, and the calculator reflects this with the clarity multiplier (1.5× for tinted, 2.5× for opaque versus the 1.0× clear baseline). The maxRecommendedMm output drops from 4mm for clear resin to 2mm for tinted and just 1mm for opaque, because beyond those depths UV light effectively can't reach the bottom of the layer in a practical cure time, regardless of how long you wait.
If the surface feels tack-free, does that mean the layer is fully cured?
Not necessarily — this is the specific risk the calculator's depth warning is built around. Because UV resin cures from the surface downward as light penetrates, a layer can feel dry on top while remaining uncured underneath, especially with pigmented resin where light barely reaches the depths. That's why the tool warns against exceeding the recommended thickness for your resin's clarity rather than relying on a surface touch test alone.
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