Concrete Coaster Sand & Cement Calculator
Get the exact weights of sand, Portland cement, water, and liquid acrylic admix for casting concrete coasters. Adjust the parameters in the interactive workbench below to get immediate recipe card outputs.
Cement & Concrete Planter Calculator
Scale from 1 prototype to full production run
MEASUREMENT OUTPUTS
Note: Water ratio is an estimate (20% baseline). Always follow specific manufacturer instructions on your cement mix bag for structural strength.
Recipe & Batch Summary
Studio Batch of 1 piece of concrete (Cylinder) using Quikrete Sand/Topping: • Per Single Unit: 1742g Dry Cement + 348ml Water [Total: 2090g]. • Total Studio Run (1 Units): 1742g Dry Cement + 348ml Water [Total Mass: 2090g / 2.09 kg]. • Water Ratio: 20% | Spill Margin: 10%.
MakerRatio • Studio Workshop Batch Sheet
https://makerratio.com • Precision Craft Formula Record
Date: _______________
Batch #: ____________
Project: Quikrete Sand/Topping (cylinder x 1)
Category: Craft Concrete & Cement
Dimensions: cylinder (x1)
Mix Ratio: Water-to-Cement: 20% | Batch: 1 unit(s)
Specific Gravity: 2.1 g/ml
Safety Spill Margin: 10%
Batch Mix Breakdown (By Exact Weight)
Workshop Safety & Quality Protocol:
[ ] Ambient room temp 70°F–78°F (21°C–25°C) & mold leveled.
[ ] Protective nitrile gloves on & workspace ventilation active.
[ ] Mix thoroughly scraping sides and bottom for 3 full minutes.
[ ] Verify pot life and demold window per manufacturer TDS.
Curing Schedule Log:
Pour Time: ___________
Gel / Tack-Free: ______
Demold Time: ________
Recommended Materials & Tools for this Project
Fine Craft Casting Cement & Sand Matrix
Specification: Rapid-setting fine aggregate concrete matrix for crack-resistant casting of planters, trays, and desktop vessels.
Penetrating Matte Concrete & Jesmonite Sealer
Specification: Low-VOC penetrating sealer for water-proofing craft concrete vessels, Jesmonite trays, and candle containers.
Transparency Notice: As an Amazon Associate, MakerRatio earns from qualifying purchases at zero extra cost to you. Product recommendations are selected based on verified Manufacturer Technical Data Sheets (TDS). Always consult chemical safety data before pouring.
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To calculate the exact volume and weight splits for this craft project, the workbench executes the following geometric equations:
Concrete Coaster Multi-Pack Batching Matrix
Fine Sand Mortar StandardDry sand mortar weight, hydration water splits, and per-cavity pour targets across circular, hexagonal, and square concrete coaster sets.
| Coaster Batch & Style | Cavity Count | Total Volume (ml) | Dry Sand Mortar (2.10 g/ml) | Water @ 13% (g) | Total Wet Slurry (g) | Per-Cavity Pour Target |
|---|---|---|---|---|---|---|
| 1 Single Round Coaster (10 cm × 1 cm) | 1 Cavity | 78.5 ml | 164.9 g (5.82 oz) | 21.4 g | 186.3 g (6.57 oz) | 186.3 g |
| Set of 4 Round Coasters (10 cm × 1 cm) | 4 Cavities | 314.2 ml | 659.7 g (23.27 oz) | 85.8 g | 745.5 g (26.29 oz) | 186.3 g |
| Set of 6 Round Coasters (10 cm × 1 cm) | 6 Cavities | 471.2 ml | 989.6 g (34.91 oz) | 128.6 g | 1,118.2 g (39.44 oz) | 186.3 g |
| Set of 4 Hexagon Coasters (10 cm × 1 cm) | 4 Cavities | 346.0 ml | 726.6 g (25.63 oz) | 94.5 g | 821.1 g (28.96 oz) | 205.3 g |
| Set of 4 Square Coasters (10 × 10 × 1 cm) | 4 Cavities | 400.0 ml | 840.0 g (29.63 oz) | 109.2 g | 949.2 g (33.48 oz) | 237.3 g |
| Large Round Trivet (18 cm × 1.2 cm) | 1 Cavity | 305.4 ml | 641.3 g (22.62 oz) | 83.4 g | 724.7 g (25.56 oz) | 724.7 g |
| 4 Coasters + Concrete Holder Base | 5 Cavities | 580.0 ml | 1,218.0 g (1.22 kg) | 158.3 g | 1,376.3 g (1.38 kg) | Custom splits |
In-Depth Crafting Guide & Density Analysis
Concrete coasters add a minimalist, industrial aesthetic to modern tabletop decor. Because concrete contains dense mineral aggregates (~2.10 g/ml), pouring thin 10mm shapes requires fine silica sand mortar rather than gravel-filled structural concrete.
This concrete coaster estimator calculates exact volume across round, square, and hexagonal molds, details dry cement mix and water weight splits, and provides per-cavity pour targets for multi-pack batch production.
Frequently Asked Questions (Concrete Coaster Cement Calculator)
Why shouldn't you use standard bag concrete (with gravel) for coasters?
Standard structural concrete contains large gravel stones (3/8" to 1/2") that will not fit into thin 10mm coaster cavities, resulting in massive voids, broken edges, and structural cracking. Always use a fine silica sand mortar mix (such as Quikrete Sand/Topping Mix or commercial craft cement).
How much concrete mix is needed for a standard set of 4 round coasters?
A set of 4 round coasters (10 cm diameter × 1 cm depth) requires 659.7 grams of dry cement mix and 85.8 grams of water (total wet slurry: 745.5 grams), allowing exactly 186.3 grams per mold cavity.
What is the best way to seal concrete coasters against coffee and red wine stains?
Raw concrete is porous and absorbs liquids immediately. Apply two coats of a penetrating silane-siloxane water repellent or a food-safe matte concrete acrylic sealer. Allow the sealer to cure for 48 hours before testing with hot liquids.
Why is liquid acrylic admix (fortifier) recommended for concrete coasters?
Replacing 50% of your mix water with a liquid acrylic concrete fortifier dramatically increases flexural strength, reduces brittleness in thin 10mm castings, enhances water resistance, and creates a silky-smooth tactile finish.
How do you apply cork backing to concrete coasters without peeling?
Ensure the bottom of the demolded coaster is flat by dry sanding with 120-grit paper. Wipe away dust completely, and adhere self-adhesive cork or apply a contact adhesive (like Gorilla Contact Adhesive) to prevent moisture from loosening the cork pad.
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