Precision ratios for
makers &
handmade sellers.
Stop wasting expensive materials and guessing your margins. MakerRatio provides clinical, B2B-grade volume formulas and cost splitting for resin casting, candle making, and handmade workshops.
Estimate Your Next BatchCraft Estimation Tools
Select your material workflow to open the interactive ratio visualizer, preset density options, and Etsy landed cost sheets.
Resin Mold Calculator
Calculate the exact Part A and Part B weights for standard and custom shapes (Rectangle, Sphere, Hexagon, Dome). Built-in presets for ArtResin, TotalBoat, Let's Resin.
Candle & Wax Melt Calculator
Determine wax weight flakes and fragrance oil loads (6%–12%) for glass containers or custom silicone molds.
Epoxy Countertop Calculator
Calculate volumes for seal coats, flood coats, or deep river channel pours. Get recommended gallon kit purchases.
Silicone Mold Calculator
Calculate the amount of 2-part liquid silicone rubber (Part A/B by weight or volume) required to pour custom mold boxes. Supports displacement calculations for complex items.
Jesmonite & Plaster
Calculate the 2.5:1 weight split (Base Powder to Liquid Resin) for Jesmonite AC100 castings.
Concrete Planter
Calculate standard concrete mixes and lightweight Hypertufa planter weights using outer/inner wall dimensions.
Water Displacement
Measure volume and mix ratios for irregular master models (3D prints, clays) using Archimedes' water overflow weights.
Etsy Fee & Profit Margin Calculator
Calculate your actual material landed costs (with shipping & tariffs), add hourly labor rates, and estimate optimal retail listing prices that cover all Etsy fees.
Why MakerRatio is the Gold Standard for Craft Calculations
Crafting is, at its heart, the science of ratios. A single mismatch in material density can cause resin to remain sticky, candles to sink, or concrete planters to crack. Many online calculators assume a uniform specific gravity of 1.0 (water equivalent), which leads to incorrect weight calculations. MakerRatio addresses this gap by utilizing a specific gravity database tailored to commercial hobby brands.
Mathematical Formula Transparency
Every volume calculation normalizes physical units (inches, feet, yards) to centimeters to ensure that 1 cubic centimeter equals 1 milliliter. Weights are then computed by multiplying the volume by the material's specific density:
For composite materials, the resulting total weight is partitioned precisely. For example, Jesmonite AC100 uses a 2.5:1 ratio, meaning liquid resin is calculated as Total Weight / 3.5, and base powder as Liquid Weight × 2.5.
Frequently Asked Questions
How do specific gravity variations affect my casting weights?
If you cast a mold with water, it weighs exactly 1 gram per milliliter. However, liquid epoxy resin is about 13% heavier than water (1.13 g/ml), silicone rubber is up to 34% heavier (1.34 g/ml), and soy wax is 14% lighter than water (0.86 g/ml). Using a generic calculator will result in under-pouring resin or over-measuring candle wax.
Why is fragrance load calculated on wax weight instead of total weight?
In professional candle making, the fragrance percentage (e.g. 8%) represents the ratio of fragrance oil weight to dry wax weight. If you calculate it based on total weight, you will overload the wax's physical capacity, causing fragrance oil to seep or pool on the candle surface (sweating).
What is "Landed Cost" in the Etsy Pricing Tool?
Landed cost is the actual total cost of acquiring raw materials, which includes their base wholesale price plus any inbound shipping, customs tariffs, duties, or delivery surcharges. Estimating craft margins without factoring in landed costs is a leading cause of unprofitable handmade listings.