THE PRACTICAL TOOLBOX
Free calculators, generators and practical tools
Each tool solves one practical problem properly and gives you something you can use: a full-size template to print, a file for CAD or a cutter, or a calculation with every step shown. No sign-up, no install: the tools run on your device.
FROM AN IDEA TO A USABLE FILE
What are you making?
14 free tools. Your measurements. A result you can use.
Quilting & fabric4 tools
Quilt backing layout calculator
Compare backing orientations and panel cuts, with seam loss, overhang and purchase rounding.
- Panel layout
- Cut dimensions
- Yardage
Quilt binding strip calculator
Count WOF binding strips after joining losses, with a separate finishing reserve.
- Strip count
- Joining losses
- Fabric quantity
Quilt border dimension planner
Plan a border round, its cut pieces and resulting top dimensions, then continue the project.
- Border cuts
- Resulting size
- Project links
Half-square triangle batch calculator
Calculate trim-safe HST starting squares and whole batches for two matching fabrics.
- Starting squares
- Batch counts
- Trim dimensions
Baking & recipes3 tools
Cake & baking pan converter
Find the recipe multiplier for the pans you have, with same-depth or planned batter-volume comparisons.
- Pan multiplier
- Area / batter volume
- Ingredient scaler link
Whole-recipe quantity scaler
Scale an editable ingredient list by servings or multiplier. Review fractions, ranges and uncertain lines before using it.
- Scaled ingredient list
- Parsing review
- Copy / print
Baker’s percentage calculator
Turn flour-relative percentages into ingredient weights for a flour amount or desired dough mass, with optional starter accounting.
- Ingredient weights
- Dough mass
- Starter flour / water
- Copy / print
Sheet metal & fabrication2 tools
Cone flat pattern calculator
Flat pattern for cones, truncated cones and reducers, with a full-size printable template.
- Full-size PDF template
- DXF
- SVG
- Mark-out table
Square to round transition calculator
Square or rectangle to round transitions and hoppers, centred or offset, with a full-size template and a true-length table.
- Full-size PDF template
- DXF
- SVG
- True-length table
- Cone flat pattern formula and how to lay it outThe formulas behind a cone or frustum pattern, a worked example, and two ways to mark it out on the metal.
- Eccentric reducer layout by triangulationWhy an offset reducer needs triangulation, with a worked true-length table and its flat pattern.
- How to lay out a square to round transitionTriangulating a square or rectangle to round, centred or offset, with a worked true-length table.
Crafts & printables3 tools
Tapered tumbler template generator
Curved wrap template for tapered tumblers and cups that bends your own design to fit, ready to print at true size.
- Print-ready PDF
- 300 dpi PNG
- SVG cut file
- Mirror for sublimation
Laser rotary tumbler calculator
Rotary engraving on tapered cups: the numbers to type for your software, a pre-warped design and a masking-tape test file.
- Settings for LightBurn / xTool
- Pre-warped PNG & SVG
- Test file (SVG/DXF)
- Stretch fix
Sphere & dome pattern generator
Gore (panel) patterns for spheres, domes and caps in fabric, foam or metal, at any size, with a full-size template.
- Full-size PDF template
- DXF
- SVG
- Width table
- Tapered tumbler wrap size: measuring and sizing a curved wrapHow to measure a tapered cup, why its wrap is curved, and how big the wrap really is.
- Rotary engraving stretched or squashed: finding the right settingMeasure a test line, then correct mm per rotation, steps or diameter with one ratio.
- How to make a sphere or dome pattern from flat panelsHow a ball or dome is made from flat gores, how many to use, and the width formula behind the shape.
Woodworking & DIY1 tool
- QRD diffuser design: well depths, width and frequency rangeThe quadratic residue sequence, well depth formula and frequency limits, worked through for N = 7 and N = 13.
- Skyline diffuser plans: from panel size to a cut listA worked 24 × 24 in skyline build: heights, counts, sticks to buy, glue map and build order.
Mixing & blending1 tool
- How to use the Pearson square methodThe method step by step, why it works, feed examples, and three-ingredient workarounds.
- Milk fat standardisation: calculations with worked examplesStandardising milk fat by adding cream or skim, or by taking cream off, with the mass balance shown.
No tools match that search. Try a material, shape or file type.
Save a printable reference: baking charts, quilting cut-planning sheets and tumbler troubleshooting.
How these tools are built
- Private by designCalculations run in your browser, and images you add are never uploaded. No accounts, no advertising trackers, and cookie-free analytics.
- Checked, not guessedEvery formula is tested against independent reference calculations and published worked examples.
- Output you can usePrintable templates at true scale, CAD-ready files, and the working behind every number.