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Workshop calculators and shop tools that run in your browser
Free tools for 3D printing, woodworking, laser, CNC and resin casting. You put in your own numbers and your own machine.
3D printing
- filament Filament Weight to Length CalculatorHow many meters of filament are in a weight, or the weight of a length, by diameter and material.→
- shrinkage Shrinkage Compensation CalculatorThe scale factor to print a part to the right final size after it shrinks, or your real shrinkage from a test.→
- job cost 3D Print Cost CalculatorWorks out what a print actually costs you, down to the power it draws and the failed ones nobody counts. Bambu, Prusa, Ender and resin presets are built in, with a suggested price to sell at.→
- run cost 3D Printer Cost Per HourWhat an hour on the machine costs you, for 11 common printers side by side. Power, wear and material, worked at your own electricity rate.→
- spool math Filament CalculatorTurn filament length into weight or back the other way, by the real density of the material. Weigh a half-used spool and see how many meters are left.→
- resize 3D Print Scaling CalculatorResize a model to the size you need and read the scale percent, or dial out a printer that comes out small or large.→
- steps per mm Steps per mm CalculatorSteps per mm for a belt or lead-screw axis, or the corrected E-steps from a measured extrusion.→
- flow rate Volumetric Flow Rate CalculatorThe flow a print asks of your hotend from width, height and speed, or the top speed a hotend can feed.→
- pour math Resin Mold CalculatorHow much resin to mix for a mold, with a little spare so you do not come up short. Splits into Part A and Part B for 1:1, 2:1 and 3:1 resins.→
Jigs to print
- drill guide Dowel Jig GeneratorSet the board, the dowel and the spacing, spin the guide around in 3D, and download a checked STL. Every hole lands dead center on the edge.→
- pin holes Shelf Pin Jig GeneratorDrills shelf pin holes on 32mm spacing at the same setback every time, so your adjustable shelves sit level instead of rocking.→
- pull holes Cabinet Hardware Jig GeneratorPuts pulls and knobs on level and centered, at the handle's own hole spacing, the same on every drawer and door.→
- slide holes Drawer Slide Jig GeneratorHolds the slide screw holes at the same height on both sides of the cabinet, so the drawer runs true and does not bind.→
- organize Drawer Divider GeneratorDividers sized to your drawer that slot together into a grid. Set the drawer, print the pieces, drop them in.→
- drill block Drill Guide Block GeneratorA block that keeps a hand drill square to the work, for whatever bit sizes you set. No drill press needed.→
- trammel Router Circle Jig GeneratorA trammel for routing a circle at whatever size you need. You set the radius, the pivot and cutter holes come placed for you.→
- grommet Desk Grommet Hole TemplateMarks the cable grommet hole on a desk, the right size and set back from the edge so the cover sits flush.→
- depth stop Drill Depth Stop GeneratorA collar that slides onto any bit and stops it at the depth you set, so every hole comes out the same.→
- round over Corner Radius TemplateA template at whatever radius you set, to mark a corner or guide a router round-over.→
- v-block V-Block GeneratorA V-block that cradles round rod or pipe so you can drill straight down the middle without it rolling.→
Woodworking
- dust cfm Dust Collection CFM CalculatorThe airflow a duct carries at a given velocity, or the duct size your machine's CFM needs to keep chips moving.→
- finish coverage Finish Coverage CalculatorHow much stain, oil, poly or paint to buy for a surface, from the area, the coats and the finish.→
- segmented ring Segmented Turning CalculatorThe miter angle, segment length and strip you need for a ring, from the segment count, diameter and ring width.→
- board cut Board Cut CalculatorHow many pieces you get from your stock once the saw kerf is counted, the offcut, and the boards a job needs.→
- pigment ratio Resin Pigment Ratio CalculatorHow much pigment, dye or mica to add to a resin batch, by weight, without stopping the cure.→
- board feet Board Foot CalculatorAdds up the board feet of your whole lumber list and the cost, from thickness, width, length and how many.→
- wood movement Wood Movement CalculatorHow much a solid wood board swells and shrinks across its width with the seasons, so you can leave room for it.→
- miter angle Miter Angle CalculatorThe angle to cut each piece for a frame, a box or a many-sided ring, or for any corner you need to turn.→
- crown molding Crown Molding Angle CalculatorThe miter and bevel to cut crown or any sprung molding flat on the saw table, for any corner you need to turn.→
- pilot hole Pilot Hole Size CalculatorThe pilot, clearance and countersink drill for a wood screw, by gauge and whether the wood is hard or soft.→
- router speed Router Bit Speed CalculatorThe top RPM a router bit should spin, from its diameter, so a big bit stays below a safe rim speed.→
- equal spacing Equal Spacing CalculatorSpace holes, pins, pickets or slats evenly across a span, or divide a board into equal parts, with every mark.→
- shelf sag Shelf Sag CalculatorHow much a shelf will bow under the weight you put on it, and whether you need to go thicker or add a support.→
- epoxy mix Epoxy Mix Ratio CalculatorHow much resin and hardener for a batch, from your ratio, with the amounts by volume and by weight.→
- epoxy coverage Epoxy Coverage CalculatorHow much resin to mix for a flood coat or a deep pour, from the area and depth, with waste and a wood allowance.→
Metalwork and machining
- stick amps Stick Welding Amperage CalculatorA starting amperage and a working range for a stick electrode, by diameter and type, with the polarity.→
- spring rate Spring Rate CalculatorThe stiffness of a compression spring from its wire, coils and material, and the force it takes to squeeze it.→
- composite density Composite Density CalculatorThe density of a fiber and resin composite from the two materials and the ratio, by the rule of mixtures.→
- countersink Countersink Depth CalculatorHow deep to plunge a countersink so a flat-head screw sits flush, from the head, the hole and the angle.→
- thread id Thread Identifier CalculatorName an unknown thread from its measured diameter and pitch, metric or inch, with the TPI and mm pitch.→
- tap drill Tap Drill Size CalculatorThe drill to run before you tap a metric thread, at the percent of thread you want, plus the clearance hole for the bolt.→
- bend allowance Bend Allowance CalculatorBend allowance, bend deduction, setback and the flat length to cut, from thickness, inside radius, angle and K-factor.→
- metal weight Metal Weight CalculatorThe weight of a metal bar, tube, sheet or plate, from the shape, the size and the material.→
- bolt torque Bolt Torque CalculatorThe tightening torque for a metric bolt from its size, grade and lubrication, and the clamp load it sets.→
- bolt circle Bolt Circle CalculatorThe X and Y coordinates of evenly spaced holes on a bolt circle, with the hole-to-hole chord and angle step.→
- cutting speed Cutting Speed to RPM CalculatorSpindle RPM from a cutting speed and a diameter, for drilling, turning or milling, with a table of starting speeds by material.→
Laser and CNC
- engraving time Laser Engraving Time CalculatorAn estimate of how long a raster engraving takes, from the area, the line spacing, the speed and the passes.→
- beam settings Laser Engraving SettingsPower, speed and passes to start from, for wood, acrylic, leather, metal and more. Scaled to your laser's wattage, diode, CO2 or fiber.→
- never laser Laser Material SafetyWhat should never go near a laser, and who says so. PVC, Kydex, polycarbonate, PTFE and the rest, each one quoted from the maker or lab that bans it, with a link so you do not have to take our word.→
- chip load CNC Feeds & SpeedsRPM, feed, plunge and depth of cut, worked from real chip-load math. Sized for a 3018, a Shapeoko or a rigid machine.→
- sheet plan Cut List OptimizerTells you how much plywood to buy and shows you how to cut it, so you waste less and spend less.→
- stepover Stepover and Scallop Height CalculatorThe ridge a ball-nose bit leaves between passes, from your stepover, or the stepover to hit the finish you want.→
Motors and electronics
- rc time RC Time Constant CalculatorThe time constant and cutoff frequency of a resistor and capacitor, or the part to pick for a cutoff you want.→
- surface speed Surface Speed CalculatorThe speed the rim or belt actually travels, from diameter and RPM, or the RPM to hit a target speed.→
- op-amp gain Op-Amp Gain CalculatorThe gain of an inverting or non-inverting amplifier from its two resistors, in volts per volt and decibels.→
- 555 timer 555 Timer CalculatorFrequency and duty cycle for a 555 astable, or the pulse width for a one-shot, from the resistors and capacitor.→
- battery pack Battery Pack CalculatorPack voltage, capacity and energy for cells wired in series and parallel, from the cell and the S and P count.→
- regulator heat Voltage Regulator Heat CalculatorThe power a linear regulator burns off, how hot it gets, and whether it needs a heatsink.→
- gear ratio Gear Ratio CalculatorThe ratio of two gears from their teeth, with the output speed and how much the torque multiplies.→
- pulley rpm Pulley RPM CalculatorThe driven pulley's speed, the drive ratio and the torque change between two pulleys, from the diameters and the drive RPM.→
- belt length Belt Length CalculatorThe belt length for a two-pulley drive, from the pulley diameters and center distance, with the tooth count for a timing belt.→
- screw torque Lead Screw Torque CalculatorThe torque a motor needs to drive a screw against a load, from the force, the lead and the screw type.→
- driver vref Stepper Driver VrefThe voltage to dial into an A4988, DRV8825 or TMC2209 for the current you actually want. Worked from the sense resistor on your own board, with every formula quoted from the datasheet.→
- led resistor LED Resistor CalculatorThe series resistor an LED needs, from your supply voltage, the LED's forward voltage and the current, with the nearest standard value.→
- voltage divider Voltage Divider CalculatorThe output of a two-resistor divider from your input voltage and both resistors, with the current and the power in each.→
- trace width PCB Trace Width CalculatorThe minimum trace width to carry a current at a chosen temperature rise, by IPC-2221, for inner or outer copper.→
- wire gauge Wire Gauge Ampacity CalculatorThe current an AWG wire can carry and the voltage it drops over a run, for low-voltage DC projects.→
- battery runtime Battery Runtime CalculatorHow long a battery runs from its capacity and your load, with the energy stored and how hard you are pulling.→
Pricing and selling
- markup / margin Markup and Margin CalculatorPrice your work from a margin or a markup, or check what a price really gives you. They are not the same number.→
- shop rate Hourly Shop Rate CalculatorWhat to charge an hour, built from the pay you want, your shop overhead and the hours you can really bill.→
- dim weight Dimensional Weight CalculatorThe weight a courier really bills for a box, from its size, its actual weight and the carrier's divisor.→
- price it Handmade Pricing CalculatorYour materials, your time, your running costs and every sales fee, turned into a break-even price and a price that hits the profit you want.→
- quote it 3D Print Quote BuilderPrices a whole job part by part, then adds your design time, finishing, shipping, tax and a deposit. Out comes a clean quote you hand the customer.→
Why everything stays on your device
MakerKiln's calculators run entirely in your browser. The presets, the math, and the results all stay on your machine. Your equipment costs, electricity rate, and prices are saved only in your browser - never sent anywhere.
Open a calculator once, and it'll keep working offline too. Handy when you're out in the shop and the Wi-Fi doesn't reach.
MakerKiln is one of five Kiln tools. The others are FileKiln for file conversion, GradeKiln for GPA calculations, ShapeKiln for design assets, and OfficeKiln for office documents. They all work the same way. Your browser does the work, and what you type stays yours.