Free Engineering Tools
298 Engineering Calculators
Professional-grade online tools for vibration analysis, rotor balancing, bearings, drives, hydraulics, metrology, and 25+ more engineering disciplines. Powered by international standards.
298 Calculators
33 Categories
100+ Standards
Free & No Registration
298 calculators
1
Vibration, Balancing & Condition Monitoring
34 calculators
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
021
022
023
024
025
026
027
028
029
030
031
032
033
034
Permissible Residual Unbalance
ISO 21940-11
Trial Weight Calculator
Permissible Vibration Velocity
ISO 10816
Permissible Vibration Displacement
ISO 1940
Permissible Vibration Acceleration
ISO 20816
Vibration Unit Converter (mm/s, μm, g, dB)
Centrifugal Force from Unbalance
Harmonic Frequency Calculator (RPM → Hz)
Rotor Critical Speed
Influence Coefficient (Balancing)
Correction Mass Decomposition (2 Planes)
Blade Correction Calculator (Fixed Positions)
Vibration Isolation Transmissibility
Overall Vibration Level
Campbell Diagram (Interference Map)
Coupling Unbalance Tolerance
Vibration Sensor Sensitivity
Vibration Phase Angle
Vibration Zones A/B/C/D by Machine Type
ISO 20816-1
Vibration: Steam Turbines & Generators >40 MW
ISO 20816-2
Vibration: Industrial Machines 15 kW–50 MW
ISO 20816-3
Vibration: Gas Turbines
ISO 20816-4
Vibration: Hydro Turbines & Pump Units
ISO 20816-5
Vibration: Reciprocating Compressors
ISO 20816-8
Vibration: Gear Drives
ISO 20816-9
Vibration: Wind Turbines
ISO 20816-21
Shaft Relative Vibration
ISO 7919
Condition Monitoring Parameters
ISO 13373
Flexible Rotor Balancing Tolerances
ISO 21940-14
Bearing Vibration (Anderon)
ISO 15242
Proximity Probe Setup
ISO 10817-1
Vibration Instrument Class Verification
ISO 2954
Vibration Source Identifier by Frequency
Remaining Life from Vibration Trend
2
Vibration Diagnostics — Defect Frequencies
8 calculators
035
036
037
038
039
040
041
042
Bearing Defect Frequencies (BPFO/BPFI/BSF/FTF)
Gear Mesh Frequency (GMF + Sidebands)
Blade Pass Frequency (BPF)
Belt Drive Defect Frequencies
Motor Electrical Defect Frequencies
Roller Chain Defect Frequencies
Journal Bearing Frequencies (Oil Whirl/Whip)
Pump Cavitation Frequency
3
Bearings
16 calculators
043
044
045
046
047
048
049
050
051
052
053
054
055
056
057
058
Bearing Load Rating & L10 Life
ISO 281
Modified Bearing Life L10a
ISO 281
Bearing Static Load Rating
ISO 76
Equivalent Dynamic Bearing Load
Bearing Minimum Load
Bearing Fit Tolerances (Shaft/Housing)
ISO 12129
Bearing Tolerance Classes (P0–P2)
ISO 492
Bearing Internal Clearance (C2–C5)
ISO 5753
Bearing Grease Quantity
Bearing Relubrication Interval
Bearing Speed Factor (n·dm)
Bearing Thermal Expansion
Bearing Heating for Mounting
Bearing Removal Force (Puller)
Bearing Damage Classification
ISO 15243
Bearing Press-Fit Force
4
Springs, Damping & Vibration Isolation
10 calculators
059
060
061
062
063
064
065
066
067
068
Natural Frequency (Mass-Spring System)
Spring Critical Speed (Surging)
Spring Selection by Target Frequency
Equivalent Spring Stiffness
Vibration Mount Selection
Compression Spring Design
Rubber Mount Calculator
Damping Ratio Calculator
Machine Vibration Isolation (Full Design)
Balancing Platform Design
5
Shafts & Rotors
11 calculators
069
070
071
072
073
074
075
076
077
078
079
Rotor Deflection on Supports
Shaft Radial Runout
Shaft Diameter (Torsion Design)
Shaft Deflection Under Load
Rotor Moment of Inertia
Keyway Connection Calculator
ISO 773
Spline Connection Calculator
ISO 4156
Press Fit Calculator
Ball Screw Calculator
ISO 3408
Rotor Acceleration/Deceleration Time
Flywheel Energy Calculator
6
Couplings & Alignment
5 calculators
7
Drives & Transmissions
14 calculators
085
086
087
088
089
090
091
092
093
094
095
096
097
098
Torque — Power — Speed
Gear Ratio Calculator
Belt Drive Calculator (Length & Center Distance)
V-Belt Calculator
ISO 5288
Timing Belt Calculator (HTD, GT)
ISO 1081
Belt Tension Calculator
Chain Drive Calculator
Roller Chain Calculator
ISO 606
Multi-Stage Drive Efficiency
Spur Gear Calculator
ISO 6336
Gear Accuracy Class
ISO 1328-1
Worm Gear Calculator
Brake Torque Calculator
Power Unit Converter (kW, hp, Nm·RPM)
8
Fasteners & Bolted Joints
14 calculators
099
100
101
102
103
104
105
106
107
108
109
110
111
112
Bolt Tightening Torque
Bolt Tensile & Shear Strength
Bolt Preload Calculator
Flange Bolt Calculator
Thread Size Converter (M/UNC/UNF/BSW)
Metric Thread Dimensions (ISO)
ISO 261/724
Bolt Strength Classes (4.6–12.9)
ISO 898-1
Nut Strength Classes
ISO 898-2
Bolt Dimensions & Weight
ISO 4014/4017
Socket Head Cap Screw (SHCS)
ISO 4762
Washer Selection
ISO 7089/7090
Rivet Joint Calculator
Stud Bolt Torque
Hydraulic Wrench Torque (Pressure → Torque)
9
Welding
3 calculators
10
Seals
3 calculators
11
Electric Motors & Electrical Engineering
14 calculators
119
120
121
122
123
124
125
126
127
128
129
130
131
132
Cable Cross-Section by Current & Length
Three-Phase Motor Power
Motor Starting Current
VFD Selection Calculator
Voltage Drop Calculator
Ohm's Law Calculator
Power Factor Correction (cos φ)
Circuit Breaker Selection
Braking Resistor for VFD
Grounding Calculator
Motor Capacitor (Single-Phase)
Motor Slip & Actual RPM
Motor Nameplate Current (FLA)
Motor Torque from Current
12
Hydraulics
10 calculators
133
134
135
136
137
138
139
140
141
142
Hydraulic Cylinder Calculator
ISO 3320
Pipe Pressure Drop
Reynolds Number Calculator
Valve Flow Coefficient (Kv/Cv)
Pipe Diameter by Flow Rate
Pipe Flow Velocity
Hydraulic Valve CETOP Dimensions
ISO 4401
Hydraulic Oil Cleanliness Class
ISO 4406
Engine Parameters (Power, Consumption)
ISO 3046
Hydraulic Accumulator Calculator
13
Pneumatics
6 calculators
14
Piping & Valves
6 calculators
15
Pumps & Fans
9 calculators
16
Strength of Materials
10 calculators
164
165
166
167
168
169
170
171
172
173
Beam Bending Calculator
Section Moment of Inertia
Stress Calculator (Tension/Compression/Shear)
Safety Factor Calculator
Euler Buckling Calculator
Thermal Stress Calculator
Fatigue Life Calculator (S-N Curve)
Hertz Contact Stress
Thin-Wall Pressure Vessel
Stress Concentration Factor (Kt)
17
Thermodynamics & Heat Transfer
8 calculators
18
Metrology, Tolerances & Fits
12 calculators
182
183
184
185
186
187
188
189
190
191
192
193
Shaft-Hole Fit Calculator
ISO 286
General Tolerances (Linear & Angular)
ISO 2768-1
General Tolerances (Form & Position)
ISO 2768-2
Surface Roughness Converter (Ra/Rz)
ISO 4287
Surface Roughness Symbols on Drawings
ISO 1302
GD&T Tolerance Reference
ISO 1101
GPS Dimensional Tolerances
ISO 14405-1
Tolerance Stack-Up Calculator
Wire Gauge Converter (AWG/mm²/SWG)
Tolerance Independence Principle
ISO 8015
Surface Parameters (Ra, Rz, Rq, Rt)
ISO 21920
Hardness Converter (HRC/HB/HV/HRB)
19
Materials Science
7 calculators
20
Lubrication & Oils
5 calculators
21
Machining & Machine Tools
7 calculators
22
Acoustics & Noise
4 calculators
23
Lifting & Rigging
4 calculators
24
Foundations & Equipment Installation
5 calculators
25
Maintenance Practice
8 calculators
26
Industry-Specific Calculators
12 calculators
234
235
236
237
238
239
240
241
242
243
244
245
Cardan Shaft Unbalance
Wheel Balancing Weights
Brake Disc Runout
Tip Speed — Mulcher / Shredder
Hammer Centrifugal Force (Crusher)
Hammer Mill Balance
Propeller Unbalance (Marine)
Separator / Centrifuge Balancing
Machine Tool Spindle Unbalance
Foundation Vibration from Machine
Fan Blade Centrifugal Force
Centrifuge G-Force (RCF)
27
General Engineering Converters
9 calculators
28
Standards & Compliance Tools
13 calculators
253
254
255
256
257
258
259
260
261
262
263
264
265
IP Rating Decoder
IEC 60529
Flange P-T Rating
ASME B16.5
Equipment Failure Classifier
ISO 14224
Motor Efficiency IE1–IE5
IEC 60034-30-1
CM Method Selector
ISO 17359
Safety Valve Sizing
ISO 4126
Balancing Machine Sensitivity
ISO 21940-31
Thermography Limits
ISO 18434
Ex Marking Decoder
IEC 60079
AQL Sampling Table
ISO 2859-1
Gage R&R
ISO 5725
Measurement Uncertainty
ISO 17025
Risk Assessment Matrix
ISO 45001
29
Advanced Vibration & Diagnostics
7 calculators
30
Electric Motor Tools
5 calculators
31
Practical Field Tools
6 calculators
32
Additional Converters
7 calculators
33
Industry-Specific (Expanded)
8 calculatorsCategories:
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
