Mechanical Calculators
Calculate gear ratios, bolt torque, HVAC tonnage, hydraulic force and machining speeds instantly with our free online mechanical calculators.
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64 calculators available
🌟 Most Searched Mechanical Calculators
Gear Ratio Calculator
Calculate gear ratio and output speed between two gears.
FeaturedBolt Torque Calculator
Calculate the correct tightening torque for a bolted joint.
FeaturedHVAC Tonnage Calculator
Calculate the right HVAC system size in tons for a space.
FeaturedMachining Speed and Feed Calculator
Calculate spindle speed and feed rate for a machining operation.
⭐ Popular Mechanical Calculators
8+ CalculatorsGear Ratio Calculator
Calculate gear ratio and output speed between two gears.
Bolt Torque Calculator
Calculate the correct tightening torque for a bolted joint.
HVAC Tonnage Calculator
Calculate the right HVAC system size in tons for a space.
Machining Speed and Feed Calculator
Calculate spindle speed and feed rate for a machining operation.
Hydraulic Cylinder Force Calculator
Calculate output force from hydraulic cylinder pressure and bore.
Duct Sizing Calculator
Calculate the right duct size for an airflow rate.
Shaft Diameter Calculator
Calculate the minimum shaft diameter needed for a given torque.
Belt Length Calculator
Calculate the required belt length for two pulleys.
⚙️ Gears & Power Transmission
10+ CalculatorsGear Ratio Calculator
Calculate gear ratio and output speed between two gears.
Gear Train Speed Calculator
Calculate output speed through a multi-gear train.
Belt Length Calculator
Calculate the required belt length for two pulleys.
Belt Tension Calculator
Calculate the correct tension for a drive belt.
Chain Drive Calculator
Calculate chain drive ratio, speed and length.
Pulley Speed Calculator
Calculate output speed for a pulley and belt system.
Sprocket Size Calculator
Calculate sprocket size and tooth count for a chain drive.
Shaft Power Calculator
Calculate power transmitted through a rotating shaft.
Torque to Horsepower Calculator
Convert torque and RPM into horsepower.
Gear Tooth Calculator
Calculate gear tooth count and pitch diameter.
🔩 Fasteners & Torque
9+ CalculatorsBolt Torque Calculator
Calculate the correct tightening torque for a bolted joint.
Bolt Pattern Force Calculator
Calculate load distribution across a bolt pattern.
Thread Pitch Calculator
Calculate thread pitch and pitch diameter for a fastener.
Bolt Preload Calculator
Calculate the required preload tension in a bolted joint.
Fastener Shear Strength Calculator
Calculate the shear strength of a fastener under load.
Torque Wrench Conversion Calculator
Convert torque values between different measurement units.
Bolt Circle Calculator
Calculate bolt hole positions around a bolt circle.
Rivet Strength Calculator
Calculate the shear strength of a riveted joint.
Weld Size Calculator
Calculate the required weld size for a given load.
💧 Fluid Power & Hydraulics
9+ CalculatorsHydraulic Cylinder Force Calculator
Calculate output force from hydraulic cylinder pressure and bore.
Hydraulic Flow Rate Calculator
Calculate flow rate needed for a hydraulic cylinder speed.
Pump Displacement Calculator
Calculate hydraulic pump displacement per revolution.
Pneumatic Cylinder Force Calculator
Calculate output force from pneumatic cylinder pressure and bore.
Hydraulic Pressure Calculator
Calculate system pressure from force and piston area.
Fluid Power Calculator
Calculate hydraulic power from flow rate and pressure.
Cylinder Speed Calculator
Calculate the extension speed of a hydraulic or pneumatic cylinder.
Accumulator Sizing Calculator
Calculate the right hydraulic accumulator size for a system.
Hydraulic Hose Size Calculator
Calculate the correct hose size for a hydraulic flow rate.
❄️ HVAC & Thermal Systems
9+ CalculatorsHVAC Tonnage Calculator
Calculate the right HVAC system size in tons for a space.
Duct Sizing Calculator
Calculate the right duct size for an airflow rate.
CFM Calculator
Calculate required airflow in cubic feet per minute.
Heat Load Calculator
Calculate the heating or cooling load for a room or building.
BTU Calculator
Calculate BTU output needed to heat or cool a space.
Refrigeration Cycle Calculator
Calculate coefficient of performance for a refrigeration cycle.
Fan Airflow Calculator
Calculate airflow output for a fan based on speed and size.
Heat Exchanger Sizing Calculator
Calculate the required surface area for a heat exchanger.
Insulation R-Value Calculator
Calculate total R-value for a layered insulation assembly.
🔧 Machine Design & Materials
9+ CalculatorsShaft Diameter Calculator
Calculate the minimum shaft diameter needed for a given torque.
Beam Load Calculator
Calculate maximum load capacity for a supported beam.
Spring Design Calculator
Calculate spring rate, force and deflection for a coil spring.
Bearing Load Calculator
Calculate the load rating needed for a bearing application.
Fatigue Safety Factor Calculator
Calculate the safety factor for a part under cyclic loading.
Material Selection Calculator
Compare material properties to select the right material for a part.
Stress Concentration Calculator
Calculate the stress concentration factor at a geometric feature.
Keyway Size Calculator
Calculate the correct keyway size for a shaft and key.
Coupling Selection Calculator
Select the right shaft coupling size based on torque and speed.
🏭 Manufacturing & Tolerances
10+ CalculatorsMachining Speed and Feed Calculator
Calculate spindle speed and feed rate for a machining operation.
Cutting Time Calculator
Calculate machining cutting time for a part.
Tolerance Stack-Up Calculator
Calculate cumulative tolerance across an assembly of parts.
Surface Finish Calculator
Calculate expected surface roughness from machining parameters.
CNC Feed Rate Calculator
Calculate the correct feed rate for a CNC machining operation.
Drill Speed Calculator
Calculate the correct drilling speed (RPM) for a material.
Sheet Metal Bend Allowance Calculator
Calculate bend allowance and flat pattern length for sheet metal.
Casting Shrinkage Calculator
Calculate mold dimensions accounting for casting shrinkage.
Injection Molding Cycle Time Calculator
Calculate the cycle time for an injection molding process.
Production Cycle Time Calculator
Calculate total cycle time for a manufacturing process.
Why Use Our Mechanical Calculators?
Whether you're designing a gear train, sizing an HVAC system or programming a CNC machine, our mechanical calculators provide fast, accurate and reliable results in seconds.
Instant Results
Get accurate mechanical calculations without manual math.
High Accuracy
Reliable formulas grounded in standard mechanical engineering practice.
Mobile Friendly
Use every calculator smoothly on desktop, tablet and mobile.
Completely Free
Unlimited calculations with no registration required.
How to Use a Mechanical Calculator
Follow these simple steps for quick and accurate results.
Choose Calculator
Select the mechanical calculator you need from the category list.
Enter Design Values
Type in dimensions, loads, speeds or pressures.
Select Materials
Choose material properties or units where applicable.
Get Result
Instantly view your calculated mechanical result.
Quick Mechanical Facts
A few concepts our calculators are built around.
Gear Ratio
A gear ratio compares the number of teeth (or diameters) between a driving and driven gear.
Bolt Torque
Proper torque creates the clamping force that keeps a bolted joint from loosening or failing.
HVAC Tonnage
One ton of cooling removes about 12,000 BTU of heat per hour.
Hydraulic Force
Hydraulic force equals system pressure multiplied by the piston's cross-sectional area.
Common Uses of Mechanical Calculators
⚙️ Power Transmission
Size gears, belts, chains and shafts for a drive system.
🔩 Fastening
Calculate bolt torque, preload and joint strength.
💧 Fluid Power
Size hydraulic and pneumatic cylinders, pumps and hoses.
❄️ HVAC Systems
Calculate tonnage, duct sizing and heat load for a space.
🔧 Machine Design
Size shafts, springs, bearings and couplings for a design.
🏭 Manufacturing
Calculate machining speeds, feeds, tolerances and cycle times.
Frequently Asked Questions
Answers to the most common questions about mechanical calculators.
What is a mechanical calculator?
A mechanical calculator solves for a design or machine value such as gear ratio, torque or airflow using standard mechanical engineering formulas based on the values you provide.
Are these mechanical calculators accurate?
Yes. Our calculators use standard mechanical engineering formulas to provide reliable estimates. Always verify critical designs against applicable codes and standards.
Can I use these calculators on mobile devices?
Absolutely. Every calculator is fully responsive and works smoothly on smartphones, tablets and desktop computers.
Are these mechanical tools free?
Yes. All mechanical calculators on Calculations.one are completely free to use without registration.
Which mechanical calculator categories are available?
We offer calculators for gears and power transmission, fasteners and torque, fluid power and hydraulics, HVAC and thermal systems, machine design and materials, and manufacturing and tolerances.
How often are new mechanical calculators added?
We regularly expand our collection by adding new mechanical calculators and improving existing tools.
Design and Build With Confidence
Explore our growing collection of professional mechanical calculators designed for engineers, technicians and machinists.