Free, private calculators that run entirely in your browser — no upload, no account. Pick a tool below; more land here as they ship.
Fabric Gathering Calculator
Test swatch → flat fabric to cut for gathers & ruffles
How Fabric Gathering Calculator works
Break-Even Calculator
Fixed & variable costs + price → break-even point + chart
How Break-Even Calculator works
Compressed Insulation Calculator
Effective R-value of batt insulation squeezed into a cavity
How Compressed Insulation Calculator worksEvery tool runs in your browser — no upload, no account, free.