Smart tools.
Real answers.
Start using 10 free online calculators today. Explore additional tools on our development roadmap across business, home, craft, design and developer workflows.
10 calculators are live. More tools are coming.
Use the live calculators above. Other cards in the roadmap become available as each tool is implemented and tested.
10 Free Online Calculators
Real working calculators with input options, instant results and clear formulas.
10 live
Roof Pitch Calculator
Roof angles, rise/run & rafter line
Markup Calculator
Selling price, cost & margin
Tile Calculator
Tile counts, grout joints & cartons
Wallpaper Calculator
Full drops, repeats & rolls
Topsoil Calculator
Cubic yards, soil depth & weight
Circle Skirt Calculator
Full, half & quarter circle radii
Quilt Backing Calculator
Yardage, panels & fabric widths
Etsy Fee Calculator
Seller fees, ad deductions & profit
Quilt Binding Calculator
Strip joins, cutting & yardage
Epoxy Resin Calculator
Pour volume, two-part mixing & weight
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Business & Ecommerce
Smarter pricing, better decisions.
8 planned
eBay Profit Calculator
Estimate your margin after selling expenses.
Digital Product Pricing Calculator
Price downloadable products with more confidence.
Break-even Calculator
Find the sales required to cover your costs.
Profit Margin Calculator
See what percentage of revenue you keep.
Discount Calculator
Calculate markdowns and final selling prices.
Freelance Hourly Calculator
Work out a sustainable service rate.
Invoice Calculator
Prepare clear line-item totals and taxes.
Marketplace Fee Comparison
Compare assumptions across selling channels.
Design & Printing
From pixels to print, precisely.
10 planned
DPI Calculator
Check how pixel dimensions translate to print.
Pixels to Inches
Convert digital dimensions into physical sizes.
Aspect Ratio Calculator
Resize proportionally without distortion.
Image Safe Area
Plan important content inside visible margins.
Paper Size Converter
Compare common international paper sizes.
Print Bleed Calculator
Prepare bleed and trim dimensions.
Social Image Size
Explore sizing for common content formats.
Print Scale Calculator
Scale artwork accurately for output.
Photo Grid Planner
Plan layouts, gutters and image placement.
Contrast Checker
Evaluate text and background contrast.
Home & DIY
Estimate confidently before you build.
8 planned
Paint Estimator
Plan paint quantities from room measurements.
Flooring Calculator
Calculate materials for floor areas.
Concrete Calculator
Work out approximate concrete volume.
Deck Board Calculator
Estimate deck materials and board counts.
Mulch Calculator
Convert bed dimensions into volume.
Gravel Calculator
Estimate aggregate required for coverage.
Room Area Calculator
Measure rooms and unusual floor plans.
Stair Calculator
Plan rise and run dimensions.
Developer & Data
Clean data. Faster workflows.
10 planned
JSON Formatter
Format and validate structured data.
CSV to JSON
Transform spreadsheet-like data into JSON.
JSON Diff
Compare nested data structures.
Regex Tester
Test expressions against sample text.
URL Encoder
Encode and decode web-safe strings.
Base64 Converter
Convert encoded text formats.
Unix Timestamp Converter
Translate machine timestamps into dates.
HTML Entity Converter
Encode and decode HTML entities.
HTTP Status Reference
Look up status codes and their meanings.
Meta Tag Preview
Preview basic page metadata.
Craft & Maker
Better measurements for creative ideas.
10 planned
Crochet Yarn Estimator
Plan approximate yarn requirements.
Crochet Gauge Calculator
Understand stitch density and sizing.
Knitting Gauge Converter
Adjust dimensions using measured gauge.
Blanket Size Planner
Plan a blanket to your preferred size.
Fabric Yardage Calculator
Estimate fabric needs for projects.
Quilt Block Calculator
Plan blocks and layout dimensions.
Embroidery Thread Calculator
Approximate material needs by design size.
Seam Allowance Converter
Convert cutting and finished measurements.
Resin Volume Calculator
Estimate fill volume for molds.
Pattern Resizer
Scale creative pattern dimensions.