Home Resin Phone Case Calculator
Resin Phone Case Calculator
How much resin do you need for a phone case? Use the coating calculator for a clear-case back layer, or enter the actual cavity volume for a full-pour silicone mold. Includes current iPhone 17 and Samsung Galaxy S26 sizes plus custom dimensions. No sign-ups. Instant results.
💡 Quick answer
Back-coating estimate: based on phone length × width × your coating thickness, with an
allowance for camera cutouts and uncoated edges
iPhone 17 at 1.5mm: about 14ml before buffer, about 16ml with the optional 15% buffer
iPhone 17 Pro Max at 1.5mm: about 16ml before buffer, about 19ml with buffer
Full-pour mold: use the mold's actual cavity/fill volume — phone dimensions alone cannot
determine the resin volume accurately
See the current phone size chart or use the calculator.
Two ways to calculate resin for a phone case
Coating method: apply a decorative resin layer to the back of an existing clear phone case. The calculator estimates resin from the phone footprint and your chosen coating thickness, then applies an approximate 85% coverage factor for camera cutouts and areas that are not coated.
Full-pour mold method: use a silicone mold to cast the case itself. Phone length and width are not enough to calculate this accurately because mold wall thickness, sidewalls, button openings, camera cutouts, lips, and corner geometry vary. For this method, enter the mold manufacturer's stated fill volume or a measured cavity volume.
ℹ️ Coating results are planning estimates based on phone footprint, selected thickness, and an approximate 85% coated-area factor. Full-pour results use the mold cavity volume you enter. Gram values are approximate and use a generic 1.05 g/ml planning density; use your resin's published density when exact mass matters.
Example: how much resin for an iPhone 17 case?
Using the coating method with the default 1.5mm thickness:
| Parameter | Value |
|---|---|
| Phone model | iPhone 17 |
| Phone dimensions used | 149.6mm × 71.5mm |
| Coating thickness | 1.5mm |
| Estimated coated area | 85% of the rectangular phone footprint |
| Base resin estimate | ~13.6 ml |
| Optional 15% buffer | ~2.0 ml |
| Total planning amount | ~15.7 ml (round to 16 ml) |
Formula: 149.6 × 71.5 × 1.5 × 0.85 ÷ 1,000 = ~13.6 ml, then add the optional 15% buffer. Actual clear-case shape and camera cutouts vary, so this is a planning estimate rather than a mold-fill measurement.
Current iPhone and Samsung sizes with coating estimates
The coating amounts below use the calculator's default 1.5mm thickness, 85% coated-area factor, and optional 15% buffer. Device dimensions are manufacturer-published phone dimensions, not clear-case dimensions.
| Phone Model | Device Size (H × W) | Coating Estimate | Full Pour |
|---|---|---|---|
| iPhone 17 | 149.6 × 71.5 mm | ~16 ml with buffer | Enter mold cavity volume |
| iPhone 17 Pro | 150.0 × 71.9 mm | ~16 ml with buffer | Enter mold cavity volume |
| iPhone 17 Pro Max | 163.4 × 78.0 mm | ~19 ml with buffer | Enter mold cavity volume |
| iPhone Air | 156.2 × 74.7 mm | ~17 ml with buffer | Enter mold cavity volume |
| iPhone 17e | 146.7 × 71.5 mm | ~15 ml with buffer | Enter mold cavity volume |
| Samsung Galaxy S26 | 149.6 × 71.7 mm | ~16 ml with buffer | Enter mold cavity volume |
| Samsung Galaxy S26+ | 158.4 × 75.8 mm | ~18 ml with buffer | Enter mold cavity volume |
| Samsung Galaxy S26 Ultra | 163.6 × 78.1 mm | ~19 ml with buffer | Enter mold cavity volume |
💡 For older models or a clear case with noticeably different outer dimensions, choose Custom / Other Phone and enter the dimensions you actually plan to coat.
Resin phone case making tips
📱 Measure the surface you will coat
Phone dimensions are useful for presets, but clear cases can be larger and camera openings vary. For the closest estimate, choose Custom / Other Phone and measure the actual back area of the clear case.
🎨 Follow the resin's recoat window
For layered designs with flowers↗ or foil↗, follow the exact epoxy manufacturer's recoat or layering instructions instead of using one universal wait time.
☀️ Choose a clear resin with UV protection
UV exposure can yellow and degrade epoxy over time. A clear epoxy with UV inhibitors↗ can improve resistance, but no fixed number of yellow-free years applies to every formula or use condition.
🔧 Wait for the specified cure before fit testing
Do not put uncured or partially cured resin against the phone. Let the exact resin reach the manufacturer's appropriate handling/full-cure milestone before final fit testing. See the Epoxy Resin Cure Time Guide.
🛒 Shop supplies:
Coating vs full-pour phone case methods
Coating method: resin on an existing clear case
How it works: Apply a decorative resin layer to the back of a compatible clear case. The underlying case provides the phone fit, sidewalls, button openings, and structural support.
Calculator method: phone length × width × coating thickness × an approximate 85% coated-area factor. Because real case shapes and camera cutouts differ, use custom measurements when accuracy matters.
Full-pour method: silicone phone-case mold
How it works: A mold defines the back, sidewalls, lips, openings, and other geometry of the case. Those features are not represented by the phone's simple length and width.
Calculator method: enter the mold's stated or measured cavity volume per case. The calculator multiplies that volume by quantity and applies the optional 15% buffer.
💡 If your mold supplier provides a fill-volume specification, use that value. If the cavity can be measured as a simpler geometric shape, the Resin Mold Volume Calculator can help.
Custom resin phone case cost and pricing worksheet
Pricing varies by blank-case quality, resin brand, design complexity, labor time, marketplace fees, packaging, and your target margin. Instead of relying on a universal retail price, calculate each component for your own process.
Track these material costs
- Blank case or mold: actual unit cost including shipping
- Resin: calculated ml per case × your cost per ml
- Colorants and inclusions: mica, inks, flowers, foil, photos, glitter, or other materials
- Consumables: mixing cups, gloves, sanding/polishing materials, and packaging
Track labor and selling costs
Record active prep, pouring, finishing, photography, packing, and customer-service time. Add the marketplace, payment-processing, advertising, shipping-subsidy, tax, and overhead costs that actually apply to your business.
Set your price from your own numbers
Use our Resin Cost Calculator to combine material and labor costs and test pricing scenarios. Recheck the calculation whenever resin prices, blank-case costs, platform fees, or your production time changes.
Design options that can increase customization value
- Photo cases: customer-supplied images sealed and embedded in the design
- Name or initial cases: lettering, foil, decals, or painted details
- Pressed-flower cases: dried botanical inclusions
- Memorial or keepsake cases: personal photos or small approved inclusions
- Matching sets: coordinated colors or designs for multiple devices
Resin phone case calculator FAQs
How much resin do I need for a phone case?
For a clear-case back coating, the amount depends on the surface dimensions, coating thickness, camera cutouts, and your waste buffer. Using this calculator's default 1.5mm thickness and 15% buffer, an iPhone 17 is about 16 ml and an iPhone 17 Pro Max is about 19 ml. For a full-pour silicone mold, use the mold's actual cavity volume instead of estimating from phone dimensions.
How does the resin phone case calculator work?
Coating mode multiplies phone length by width and your selected coating thickness, then applies an approximate 85% coated-area factor for camera cutouts and uncoated edges. Full-pour mode uses the mold cavity volume you enter because sidewalls, openings, lips, and mold geometry cannot be inferred accurately from phone dimensions alone.
How much resin do I need for an iPhone 17 case?
With the coating calculator set to 1.5mm and the optional 15% buffer, the iPhone 17 preset uses about 16 ml as a planning amount. The base estimate is about 13.6 ml before buffer. A real clear case may have different outer dimensions or cutouts, so measure the actual case and use Custom / Other Phone when you need a closer estimate.
How do I calculate resin for a full-pour phone case mold?
Use the mold manufacturer's stated fill volume or measure the mold cavity volume. A full phone-case mold includes sidewalls, camera and button openings, corner radii, and lips, so phone length × width × thickness is not enough to calculate its resin volume reliably. Enter the cavity volume per case in Full Pour Mold mode and the calculator will multiply it by quantity and add the optional buffer.
Can I use clear epoxy resin on a phone case?
Clear epoxy can be used for decorative coating projects when the product is suitable for the intended coating thickness and substrate. UV exposure can yellow and degrade epoxy over time, so a formula with UV stabilizers or inhibitors is preferable for items that see light. Follow the exact epoxy manufacturer's surface-preparation, mixing, coating-depth, cure, and service instructions.
Will UV-resistant epoxy stay clear forever?
No fixed yellow-free lifetime applies to every epoxy. UV exposure is a known contributor to epoxy yellowing and other surface changes. UV stabilizers or inhibitors can improve resistance, but performance depends on the formula, exposure level, temperature, thickness, and other conditions.
When can I put the resin phone case on my phone?
Wait until the exact resin has reached the manufacturer's appropriate handling or full-cure milestone for the application. Do not place uncured or partially cured resin against the phone. Cure times vary by product and temperature, so use the product instructions and the Epoxy Resin Cure Time Guide rather than a universal 24-, 48-, or 72-hour rule.
How do I add a photo to a resin phone case?
Paper and printed images may need sealing before resin is applied so ink does not bleed and paper does not absorb resin. Use a clear, compatible sealant, allow it to dry fully according to its instructions, and test the combination on scrap material before committing a customer photo or important print.
Which current phone sizes are included in the calculator?
The current presets include iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, iPhone Air, iPhone 17e, Samsung Galaxy S26, Galaxy S26+, and Galaxy S26 Ultra, plus several older presets and a Custom / Other Phone option. The calculator uses manufacturer-published device dimensions as planning inputs for coating mode.