Browse by Category
Measurement, geometry, woodworking, mechanical, electrical, construction, materials, and finishing are each grouped together.
Every tool
All Workshop Calculators
Browse by category, then open the exact calculator you need. Everything here is set up to be quick to find, quick to use, and easy to double-check.
45 calculators8 categoriesSearchable by problem or tool name
Search by Problem
If you do not know the tool name, search for the job itself, like bearing dimensions or space holes evenly.
Learn As You Go
Each calculator explains the common mistakes that happen before or after the number is correct, not just the raw result.
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Saved and recently used calculators stay in this browser. No account is required.
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Newest calculators
Drywall quantity, reducer percentage, hydraulic cylinder force, segmented ring, and resistor network tools are now available.
Measurement
Fractions, decimals, metric, imperial, feet, inches, and mixed workshop measurements.
- Fraction to Decimal
- Decimal to Fraction
- Metric and Imperial Converter
- Feet and Inches Calculator
- Measurement Difference Calculator
5 calculatorsCharts and converters
Geometry and Layout
Spacing, centers, circles, scale drawings, triangles, and bolt circles.
- Scale Drawing Calculator
- Equal Spacing Calculator
- Hole Spacing Calculator
- Midpoint Calculator
- Right Triangle Calculator
- Bolt Circle Calculator
- Circle and Arc Calculator
7 calculatorsLayout and pattern work
Woodworking
Lumber volume, saw kerf, and weight estimates for practical shop work.
- Board Foot Calculator
- Saw Kerf Calculator
- Lumber Weight Calculator
- Drawer Box Calculator
- Compound Miter Calculator
- Segmented Ring Calculator
- Wood Movement Calculator
7 calculatorsWood and stock planning
Mechanical
Machine-side math for bearings, pulleys, belts, hydraulics, tapping, speed, and gears.
- Bearing Size Calculator
- Pulley Ratio Calculator
- Gear Ratio Calculator
- Belt Length Calculator
- RPM and Surface Speed Calculator
- Hydraulic Cylinder Force Calculator
- Tap Drill Calculator
7 calculatorsDrive systems and fit checks
Electrical
Resistance, loads, speaker wiring, current, voltage, and power checks.
- LED Resistor Calculator
- Speaker Impedance Calculator
- Ohm’s Law Calculator
- Voltage Drop Calculator
- Battery Runtime Calculator
- Series and Parallel Resistor Calculator
- Wire Size Calculator
7 calculatorsIncludes safety guidance
Materials and Quantities
Estimate material weight and epoxy volume without fighting the units.
2 calculatorsEstimating help
Construction
Practical estimating and layout for paint, concrete, stairs, drywall, and roof pitch.
- Paint Coverage Calculator
- Concrete Volume Calculator
- Stair Calculator
- Drywall Quantity Calculator
- Roof Pitch Calculator
5 calculatorsConstruction estimating
Finishing
Mixing ratios and finish prep math that helps keep waste down.
- Epoxy Mix Ratio Calculator
- Finish Coverage Calculator
- Spray Mixture Calculator
- Reducer Percentage Calculator
- Catalyst Ratio Calculator
5 calculatorsFinishing and coatings
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