All Tools
Every free, working ToolHuts tool, grouped by category.
Leathercraft
Belt Hole Layout
Lay out evenly spaced belt or strap holes around a measured centre hole and print a full-size guide.
Buckle Fold Template
Mark a measured buckle fold and tongue slot on a full-size strap pattern.
Bag Gusset
Find rounded-panel stitch perimeter, corner transitions and gusset cut length.
Stitch Hole Spacing
Fit a whole number of stitch intervals to a measured seam and print exact hole positions.
Corner Stitch Spacing
Distribute stitch holes through straight runs and a rounded corner.
Rivet Spacing
Space rivets or studs between measured end margins and print a punch guide.
Corner Radius Template
Generate a full-size quarter-circle gauge for a measured leather corner radius.
Fabric Crafts
Quilt Backing
Compare vertical and horizontal backing-panel layouts, yardage or metres, seams and waste from your quilt and usable fabric width.
Quilt Binding
Calculate perimeter, WOF strip count and fabric to buy from your quilt size, cut-strip width and joining allowance.
HST Calculator
Find exact source-square counts, trim-friendly cutting size and batch instructions for two-, four- or eight-at-a-time HSTs.
Circle Skirt Pattern
Draft full-, half- or quarter-circle skirt geometry with explicit waist and hem allowances, then download a calibrated tiled pattern.
Model Railroad
Grade Calculator
Find the grade, vertical easements and riser heights for a climb, or the run needed for a target grade.
Helix Calculator
Work out helix grade, turns, track length and footprint, and print a full-size deck segment template.
Easement Template
Print a full-size spiral easement and curve template for model railroad track, with the exact offset from the tangent.
Curve Template
Print a full-size circular curve template for one or two tracks, with chord, sagitta and radial tick marks.
Curve Clearance
Find how far cars swing in and out on a curve and the minimum spacing between parallel tracks.
Scale Speed
Convert a timed run over a measured distance into scale mph and km/h, or find the time for a target speed.
Train Length
Scale a train's prototype length to the model, check it against your siding and find how many cars fit.
Home Theater & AV
UPS Runtime
Estimate runtime from total battery-pack capacity and measured rack load, while checking both UPS watt and VA ratings.
Seating Sightlines
Estimate the row heights needed for each sightline to clear an assumed head height in the row ahead.
Outdoor Cinema Screen
Compare near and far audience viewing angles with screen dimensions, size bounds and ideal dark-screen brightness.
Golf Sim Screen
Fit an aspect-correct impact-screen image inside clear room dimensions and calculate the projector lens throw range.
Anamorphic Screen
Plan constant-image-height scope geometry, same-height 16:9 size, side masks and anamorphic stretch.
TV vs Projector
Compare how image size, ambient light, daily use, budget and installation affect the choice without assigning an artificial winner.
Ultrawide Equivalent
Compare an ultrawide with 16:9 screens at the same physical height or width and with a bezel-free dual-screen split.
Monitor Distance
Combine a maximum horizontal field of view with minimum pixels per degree to find a practical desk distance.
PPD / PPI
Calculate screen or monitor pixels per degree at your viewing distance, then compare angular PPD with physical PPI and pixel pitch.
Speaker Cable Gauge
Compare copper AWG loop resistance and signal loss, then select the thinnest gauge within a chosen limit.
Amplifier Power / SPL
Estimate listening-position SPL and reverse-calculate watts per speaker for a target plus headroom.
Panel Area
Compare panel face area and estimated absorption with room surface area using an explicitly entered reference target.
Reflection Points
Locate symmetric side-wall first reflection points with the mirror-source method and real room coordinates.
Atmos Layout
Calculate two- or four-speaker overhead coordinates from ceiling height, ear height and elevation angle.
Surround Speaker Angles
Plot symmetric 5.1 or 7.1 speaker positions from reference listening angles and an editable radius.
Subwoofer Placement
Plot practical boundary, centre and quarter-room subwoofer test positions around the listening seat.
Speaker Placement
Lay out a centred stereo triangle from room dimensions, speaker offset and listening position.
RT60 Calculator
Estimate Sabine reverberation time and the total absorption needed for an editable decay target.
Room Mode Calculator
Enumerate axial, tangential and oblique room resonances and inspect close low-frequency clusters.
Screen Gain
Calculate the screen gain or delivered lumens needed for a brightness target, then compare common gain values.
Projector Brightness
Estimate foot-lamberts from delivered lumens, screen size and gain, or reverse-calculate required output.
Projector Screen Size
Find the largest image that fits your lens distance, throw ratio and usable wall height.
Projector Throw Distance
Calculate lens-to-screen distance, throw ratio or screen diagonal with a scaled optical diagram.
TV Size Comparison
Compare two TV sizes by physical dimensions, visible area and viewing angle from the same seat.
4K/8K Distance
Compare 1080p, 4K and 8K angular pixel density at your actual screen size and seat.
TV Mount Height
Calculate screen centre, top, bottom and VESA reference height from your actual seated sight line.
TV Dimensions
Convert advertised diagonal and aspect ratio into visible width, height, area and estimated bezel size.
Aspect Ratio
Simplify a width-to-height ratio and calculate matching dimensions without stretching.
TV Viewing Distance
Compare your current seat position with editable viewing-angle distances for any TV size.
TV Size Calculator
Find a TV diagonal from viewing distance and angle, then compare three screen sizes in a to-scale room view.
Passive Crossover Calculator
Calculate starter inductor and capacitor values for a first- or second-order passive speaker crossover.
Port Velocity Calculator
Estimate peak port air speed and Mach number from cone area, excursion, frequency and port dimensions.
Speaker Box Calculator
Calculate gross and net internal enclosure volume, a six-panel cut list and an estimated port length.
Impedance & L-Pad Calculator
Calculate the equivalent nominal impedance of series, parallel or series-parallel drivers and size an L-pad attenuator.
Subwoofer Port Calculator
Calculate port tuning from a known port length, or solve the port length for a target tuning frequency.
Bandpass Enclosure Planner
Plan sealed rear and vented front chamber volumes for a fourth-order single-reflex bandpass enclosure.
Driver Displacement Calculator
Estimate the internal enclosure volume displaced by a driver's basket and motor assembly.
Automotive
Wheel Offset Calculator
Compare a current and proposed wheel/tyre setup and see exactly how the geometry changes.
Tire Size Calculator
Compare two tyre sizes side by side - diameter, sidewall, circumference and speedometer effect.
Alternative Tire Sizes
Find standard tire sizes, including different wheel diameters, that keep overall diameter within a chosen tolerance of a starting size.
Wheel Spacer Calculator
See how a wheel spacer changes your effective offset and how far the wheel moves outward.
Scrub Radius Calculator
See how much a wheel offset or spacer change shifts your scrub radius from a known baseline.
Gear & RPM Planner
Compare road speed and engine RPM across six transmission gears using tire diameter and axle (final-drive) ratio.
Speed / RPM Converter
Convert road speed to engine or driveshaft RPM, or RPM to road speed, from tire diameter and one gear ratio.
Print & Scale
Print to Scale
Upload an image, set one measured dimension, and prepare a full-size tiled PDF with a calibration check.
Paper Size & Scale
Find the scale percentage to enlarge or reduce a document between standard paper sizes, with the full A0-A6 reference chart.
Bleed & Crop Marks
Generate a printable bleed, safe-area and crop-mark reference sheet for a trim size.
Model Scale Converter
Convert dimensions between real-world size and model scales, and get a 3D-print slicer resize percentage.
Image DPI Checker
Inspect an image locally and see its print size, effective PPI and paper-size fit.
Fret Slot Template
Generate a full-size, printable fret slot layout for twelve-tone equal temperament from scale length and fret count.
Tonearm Protractor
Generate a printable pivot-specific tonearm alignment protractor for Lofgren A/Baerwald, Lofgren B or Stevenson geometry.
Workshop
Pipe Notch Template
Generate a full-size fishmouth or saddle template for the theoretical intersection between two tubes.
Bolt Circle Template
Enter a bolt circle diameter and hole count to generate a full-size printable template with a calibration check.
Drill Hole Template
Lay out custom rows of drill holes with exact spacing and download a printable template.
Printable Ruler
Prepare a full-size metric, imperial or combination ruler and verify the printed calibration square before use.
Printable Protractor
Prepare a full-size 180° protractor and verify its printed calibration mark before use.
Drill Point Calculator
Find a drill's tip length and how deep to drill for a target full-diameter blind-hole depth.
Countersink Calculator
Solve countersink depth, major diameter, pilot diameter or included angle with a live section view.
Sine Bar Stack Calculator
Calculate sine-bar height and find a short metric gauge-block combination near the target.
Fabrication
Bend Allowance Calculator
Calculate sheet-metal bend allowance, deduction and setback, or find K-factor from a measured test bend.
Cone Flat Pattern
Generate the flat (developed) pattern for a truncated cone from its top/bottom diameters and height.
Square to Round
Develop the flat-pattern panels for a square or rectangle-to-round duct or pipe transition by triangulation.
Reducer Layout
Develop the flat-pattern template for a pipe reducer, concentric or eccentric, including the fully flush case.
Flat-Oval to Round
Develop the flat-pattern template for a centered transition between flat-oval and round duct.
Box & Pan Pattern
Develop the one-piece flat-pattern blank for a four-flange sheet metal box, pan or tray, with corner relief.
Segmented Elbow
Lay out a gored/lobster-back elbow's miter angles and per-piece flat pattern from diameter, bend radius, angle and piece count.
Duct Rolled Offset
Calculate rolled-offset travel, advance and roll angle, with a printable mitered-elbow cut template.
Chain & Sprocket Calculator
Calculate roller-chain pitch length, adjusted center distance and sprocket speed ratio from tooth counts.
Metal Weight Calculator
Calculate the weight of plate, round bar, square bar, tube or angle stock from cross-section, density and cut list.
Surface Speed Calculator
Solve spindle RPM and feed rate from target cutting speed for turning or milling operations.
Tap Drill Calculator
Calculate the theoretical tap drill diameter for a metric or unified thread at a target percent of thread engagement.
V-Belt Length Calculator
Calculate V-belt pitch length from pulley diameters and center distance, or solve center distance from a selected belt length.
Screw Flight Pattern
Develop an annular-sector workshop blank for one screw-flight turn from outside diameter, shaft diameter and pitch.
Pipe Fitting Takeoff
Deduct user-supplied fitting center-to-end dimensions from field measurements to find a pipe cut length.
Offset Branch Template
Generate a full-wrap branch-pipe intersection profile with a signed axis offset and branch angle.
Pipe Offset Clocking
Convert vertical and lateral offsets into near/far-end clock positions and circumference marks from an established datum.
Offset Multiplier
Calculate travel and run for a same-plane pipe offset from the offset distance and fitting angle, with the standard multiplier chart.
Truncated Pyramid Pattern
Develop the four true-size trapezoid panels for a centered rectangular truncated pyramid.
Hopper Flat Pattern
Develop four printable trapezoid panels for a centered rectangular hopper inlet and outlet.
Oblique Cone Pattern
Triangulate an offset-apex circular cone into a printable developed blank with true generator lengths.
Duct Seam Allowance
Estimate rectangular or round duct blank girth with a shop-specified seam allowance, in millimetres or inches, plus strips per stock width.
Woodworking
Plywood Cut Calculator
Nest an arbitrary parts list onto sheets to minimize waste, with a visual cutting layout you can print.
Linear Cut List Optimizer
Optimize cutting a list of lengths from stock bars/boards, minimizing offcuts and stock used.
Board Foot Calculator
Calculate board feet and total cost for dimensional lumber.
Miter Angle Calculator
Find the miter saw angle for a regular-shape frame or a custom corner angle.
Drawer Box Calculator
Size a drawer box from the cabinet opening and slide length, then send the parts to a cut optimizer.
Cabinet Door Calculator
Calculate stile, rail and panel sizes for a rail-and-stile cabinet door, then send parts to a cut optimizer.
Kerf Bend Calculator
Calculate saw-kerf count, spacing and depth for a curved panel, then export a full-size marking layout.
Pocket-Hole Screw Calculator
Calculate a recommended pocket-hole screw length from joint geometry and warn if it would blow through the base workpiece.
Segmented Bowl Calculator
Calculate miter angle, trapezoid edge lengths and kerf-aware stock length for a segmented turning ring.
Shelf Pin Layout Calculator
Generate a full-size, printable shelf-pin drilling template at the 32 mm system pitch or a custom pitch.
Shelf Sag Calculator
Estimate center deflection of a shelf under a uniform or center point load from span, dimensions and modulus of elasticity.
Bay-Window Miter Set
Find matching miter-saw settings and trim long-point offsets for polygon corners or measured bay-window turns.
Drawer-Slide Clearance
Size a drawer box from cabinet opening dimensions and editable side, top, bottom and rear slide clearances.
Cabinet Door Collision
Check two perpendicular corner cabinet doors at chosen opening angles with a top-view collision diagram.
Face Frame Layout
Divide a cabinet face frame into equal openings and generate an optimizer-ready stile and rail cut list.
Drawer Pull Template
Calculate centered knob or pull holes and print a full-scale drawer-front drilling template.
Hinge Cup Template
Lay out editable concealed-hinge cup centers and screw holes on a full-height printable door template.
Construction
Baluster Spacing Calculator
Enter the railing opening, baluster width and maximum gap you intend to use to calculate an equal-spacing layout.
Fence Picket Spacing
Lay out fence picket spacing across a run, with a live diagram of the finished fence section.
Stair Calculator
Work out riser and tread count, riser height and stair angle from total rise and run.
Roof Pitch Calculator
Visualize roof pitch as rise/run, degrees and a scaled triangle diagram.
Tile Layout Calculator
Plan a tile grid across a room, centered or edge-started, with grout gaps and edge-cut sizes.
Concrete Volume Calculator
Calculate concrete volume for a slab, footing, column or cylinder, with a labeled diagram.
Gravel Calculator
Calculate how much gravel, mulch or soil you need for an area and depth.
Paint Calculator
Calculate how much paint you need for walls, accounting for doors, windows and coats.
Brick Calculator
Estimate the number of bricks or blocks needed for a wall, including mortar joints.
Hip Rafter Calculator
Calculate hip rafter length and angle plus a full jack-rafter length table for a hip corner.
Advanced Hip/Valley/Jack
Calculate hip, valley and jack rafter seat cuts and compound cheek (side) cuts, beyond length and plumb angle alone.
Compound Crown Molding
Calculate the flat-cut compound miter and bevel saw settings for crown molding from spring angle and wall corner angle.
Birdsmouth Calculator
Turn roof pitch and plate width into birdsmouth seat, notch depth and height-above-plate dimensions.
Winder Stair Layout
Lay out a balanced quarter-turn winder stair with tread geometry, walk-line goings and a scaled plan diagram.
Irregular Hip Roof
Calculate the shifted plan angle, true hip length, face-specific backing bevels and jack differences for unequal roof pitches.
Unequal-Pitch Valley
Calculate internal valley centerline geometry, separate backing bevels and side-specific jack differences for two unequal roof pitches.
Polygon Roof Calculator
Calculate common and hip centerline rafters, rise, plan angles and roof-face area for regular 3–16-sided roofs.
Shed Dormer Framing
Intersect a shed-dormer roof with the main roof to find tie-in location, rafter length and theoretical cheek-valley line.
Packaging
RSC Carton Layout
Draw a basic RSC-style cut and fold layout for early sizing and mock-ups from internal carton dimensions.
Label Sheet Generator
Define label size, gaps and margins to generate a printable grid of blank label outlines.
Label Roll Calculator
Calculate label roll length, label count and labels remaining from core and roll diameters.
Corrugated Box Weight
Estimate RSC blank area, board grammage, box weight and material cost from editable paper and flute inputs.
Logistics
Pallet Layout Calculator
Estimate identical cartons per uniform pallet layer in one orientation, with a top-down layout and stacking totals.
CBM Calculator
Calculate cubic meters (CBM) for one or more cartons, with a scaled cuboid visualization.
Dimensional Weight Calculator
Calculate dimensional (volumetric) weight from carton size and a configurable divisor.
Container Carton Estimate
Estimate identical cartons in a container using one uniform orientation, with a simple layer preview.
LDM Calculator
Calculate loading metres for road freight from cargo footprint, quantity and stack layers.
LCL Revenue Ton Calculator
Compare shipment CBM with its weight basis to estimate LCL revenue tons and base freight.
Contractor Business
Loaded Labor Rate
Build the fully-loaded hourly cost and bill rate behind a bare wage, with a visual cost-stack breakdown.
Roofing Piece Rate
Calculate roofing labor and material cost per square from roof area, piece rate, crew capacity and waste factor.
Crew Cost Per Day
Blend a mixed-role crew's daily labor cost and compare it against expected piece-rate revenue for the day.
Bid Price Builder
Build a bid price from labor, material, other cost, overhead, contingency and target profit margin, with a visual cost stack.
Painting Labor
Price painting application labor per square foot per coat and estimate crew time from an editable productivity rate.
Minimum Service Call
Price a minimum service visit from travel, admin and onsite loaded labor, vehicle cost, consumables and target margin.
Billable Rate
Convert annual compensation, burden, overhead and realistic billable utilization into break-even and target-margin hourly rates.
Layout & Planning
Even Spacing Calculator
Evenly space any number of objects across an opening - holes, hooks, posts, anything.
Gallery Wall Planner
Plan evenly spaced picture frames across a wall, centered, with a scaled wall diagram.
Dining Table Planner
See how many seats fit around a table and whether the table and chairs fit your room.
Picture Hanging Calculator
Find exact wall fixing height and horizontal coordinates from frame size, centre height and real hardware drop.
Off-Grid & DC Power
DC Voltage Drop
Find the thinnest standard copper wire gauge that keeps voltage drop at or below your target for a 12V, 24V or 48V DC circuit.
Solar & Battery Sizing
Size a solar array and battery bank from your daily energy use, peak sun hours, system losses, depth of discharge and days of autonomy.
Fit & Clearance
Refrigerator Clearance
Compare a refrigerator case with its measured opening and editable manufacturer side, top and rear clearances.
Dishwasher Clearance
Check dishwasher body clearances and the fully open door against the available aisle.
Sofa Route Checker
Screen upright, on-back and end-first sofa orientations against a doorway and the route's narrowest clearance.