Home, crafts and workshop
Home, crafts and workshop: 24 free calculators & tools, including Paint coverage and Wallpaper rolls. Explore formulas, examples and visual explanations.
Home & garden
Paint coverage
Estimate paint for walls and ceilings, accounting for openings, coats and waste.
Wallpaper rolls
Estimate full wallpaper drops and rolls from wall dimensions, trim and pattern repeat.
Tile quantity
Estimate tile pieces and boxes by area, including your entered waste allowance.
Flooring quantity
Total room areas and estimate packs, purchased area and cost with waste included.
Concrete volume
Estimate rectangular or cylindrical concrete volumes, bag quantities and entered delivery costs.
Soil and mulch volume
Estimate fill volume and bag count for rectangular beds or circular areas.
Paver quantity
Estimate paving pieces, packs and base-material volume from your dimensions and allowance.
Fence posts and panels
Estimate posts and bays for open runs, closed loops and separately entered gates.
Garden planting layout
Count planting positions for aligned or staggered rows with explicit spacing and edge margins.
Tank and aquarium volume
Estimate water capacity and water-change volume from internal dimensions and fill height.
Slope, grade and rise/run
Convert rise and run, percentage grade or angle, and calculate the inclined length.
Crafts & materials
Booklet printing planner
Plan folded booklet page order, blank pages and paper sheets for left or right binding.
Knitting and crochet gauge
Turn measured gauge into stitch and row counts, with pattern repeats and achieved dimensions.
Curtain fabric planner
Plan full fabric widths, cut lengths and purchase metres for equal curtain panels.
Resin batch mixer
Split a total batch into resin and hardener using the manufacturer’s weight or volume ratio.
Candle batch planner
Calculate wax and fragrance amounts from finished fill weight, candle count and fragrance load.
Epoxy pour and coating quantity
Plan a rectangular or circular pour, add an allowance and calculate resin and hardener quantities.
Energy & water
Mechanics & tools
Compound miter angles
Find miter and bevel settings for crown molding laid flat or a tapered regular box.
Belt length and pulley centers
Solve open-belt pitch length or center distance for two pulleys, with wrap angles.
Thermal expansion and fit
Compare a part and opening as temperature changes, showing clearance or interference.
Drill speed and feed
Calculate spindle RPM, cutting speed and feed rate using your tool’s cutting parameters.
Torque wrench extension correction
Adjust the wrench setting for an adapter that changes the effective lever length.
Pulley and gear ratio
Calculate output shaft speed and ideal torque multiplication across up to six drive stages.