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Every calculator, converter, and reference chart on the site in one alphabetical list, grouped by type. Use Ctrl/Cmd + F to jump straight to a name if you already know it.
Calculators 45
Battery Runtime Calculator
Estimate battery runtime from capacity, load and efficiency.
Bearing Dimensions and Size Converter
Compare bearing bore, outside diameter and width in metric and imperial units.
Belt Length Calculator
Estimate open belt length, pulley ratio and driven speed.
Board Foot Calculator
Calculate lumber volume, waste allowance and estimated cost.
Bolt Circle Calculator
Lay out evenly spaced holes around a bolt circle and list the angle and coordinates of each one.
Catalyst Ratio Calculator
Divide a finish batch into base, catalyst, and optional reducer.
Center Point Calculator
Find the midpoint between two measurements or coordinate points.
Circle and Arc Calculator
Calculate circumference, area, arc length, chord length and segment height.
Compound Miter Calculator
Calculate miter and bevel settings for compound joints.
Concrete Volume Calculator
Estimate concrete for slabs, pads, footings and rectangular pours.
Decimal to Fraction
Find the nearest common fraction and see exactly how much rounding changed the number.
Drawer Box Calculator
Calculate drawer box dimensions and panel sizes from an opening and slide clearance.
Drywall Quantity Calculator
Estimate drywall sheets from wall and ceiling area, sheet size, openings, and waste.
Epoxy Mixing Ratio Calculator
Divide a total batch or known component amount into Part A and Part B.
Epoxy Volume Calculator
Estimate mixed epoxy for rectangular pours, circular pours and surface coatings.
Equal Hole Spacing Calculator
Find the center position of every hole from one fixed edge.
Equal Spacing Calculator
Divide a length into equal gaps while accounting for object width.
Feet and Inches Calculator
Add, subtract, multiply and divide feet, inches and fractions.
Finish Coverage Calculator
Estimate clear coat, stain, sealer or finish from area, coats and coverage.
Fraction to Decimal
Convert fractions and mixed numbers into decimals, millimeters and percentages.
Gear Ratio and Speed Calculator
Calculate gear ratio, output speed, rotation direction and theoretical torque change.
Hydraulic Cylinder Force Calculator
Estimate hydraulic cylinder extension and retraction force from pressure, bore, and rod diameter.
LED Resistor Calculator
Calculate resistance, current and resistor wattage for an LED circuit.
Lumber Weight Calculator
Estimate lumber weight by species, dimensions, quantity and moisture.
Material Weight Calculator
Estimate material weight from shape, dimensions, density and quantity.
Measurement Difference
Compare two measurements and see how far one is above or below the other.
Metric and Imperial Converter
Convert mixed workshop measurements in either direction.
Ohm’s Law Calculator
Find voltage, current, resistance and power from any two known values.
Paint Coverage Calculator
Estimate paint needed from dimensions, coats, deductions, coverage and waste allowance.
Pulley Ratio and Speed Calculator
Calculate pulley ratio, output speed, belt travel and theoretical torque change.
Reducer Percentage Calculator
Calculate reducer amount and final mixed volume from a base amount and reduction percentage.
Right Triangle Calculator
Calculate missing sides, angles, slope, area, and perimeter.
Roof Pitch Calculator
Calculate roof pitch, angle, rafter length, and rise from run.
RPM and Surface Speed Calculator
Convert RPM and diameter into surface speed, or calculate RPM.
Saw Kerf Calculator
Calculate blade loss, required stock length and remaining material.
Scale Drawing Calculator
Convert between a drawing measurement and the actual size.
Segmented Ring Calculator
Calculate segment angles and outer and inner segment lengths for a segmented ring.
Series and Parallel Resistor Calculator
Calculate total resistance for resistor values connected in series or parallel.
Speaker Impedance Calculator
Calculate the nominal load of matching speakers in common wiring arrangements.
Spray Mixture Calculator
Divide a spray finish batch into base, reducer and hardener.
Stair Calculator
Calculate equal risers, tread run, stair angle and stringer length.
Tap Drill Calculator
Estimate tap drill size from thread diameter and pitch.
Voltage Drop Calculator
Estimate copper wire voltage loss, load voltage and wire power loss.
Wire Size Calculator
Estimate a copper wire gauge from current, distance, voltage, and allowable voltage drop.
Wood Movement Calculator
Estimate seasonal wood movement across the grain.
Converters 6
Area Converter
Convert metric, land, surveying, and specialized area units.
Length Converter
Convert common, surveying, nautical, scientific, and historical length units.
Pressure Converter
Convert SI, customary, atmospheric, mercury, and water-column pressure units.
Temperature Converter
Convert modern and historical temperature scales.
Volume Converter
Convert metric, cubic, US, Imperial, trade, and historical volume units.
Weight Converter
Convert metric, avoirdupois, Troy, engineering, and historical mass units.
Other: Reference Charts 5
Drill Size Comparison Chart
Compare common fractional, number, and metric drill sizes.
Fastener Hole Reference
Understand pilot, tap, clearance, counterbore, and countersink holes.
Fraction Decimal and Millimeter Chart
Compare common inch fractions with decimal and millimeter equivalents.
Material Density Reference
Approximate densities for common workshop materials.
Wire Gauge Reference Chart
Compare common AWG diameters and copper resistance.
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Games
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Battle of the Wits
Challenge Goldie to a trivia match while you take a break.
Goldie Chess
Choose a difficulty and play a full chess game against Goldie.
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