Calculator

This online crane sheave minimum diameter calculator complies with ISO 16625:2013 to calculate the minimum pitch circle diameter of crane sheaves — covering both main working sheaves and balance sheaves — based on wire rope nominal diameter, mechanism duty class, sheave category, and rope strand type. Correctly sizing sheave diameter prevents premature wire rope fatigue, reduces the risk of rope dislodgement, extends rope service life, and keeps operating costs under control across overhead travelling cranes, gantry cranes, mobile cranes, and jib cranes. Crane Sheave Minimum Diameter Calculator Input crane type, duty class, sheave category, rope strand coefficient, and wire rope diameter to calculate minimum sheave pitch diameter Sheave Parameters Crane Type Overhead Travelling CranesPortal or Semi-portal CranesPortal or Semi-portal Bridge CranesCantilever Cranes (Pillar, Jib, Wall or Walking)Mobile Crane Duty Class (ISO 4301-1) M1M2M3M4M5M6M7M8 Sheave Category Main Working Sheave (h2)Balance Sheave (h3) Sheave Category Main Working Sheave (h2)Balance Sheave (h3) Mechanism Type Lifting MechanismJib / Luffing MechanismTelescope Mechanism Rope Type Standard RopeRotation Resistant Rope Rope Strand Coefficient (t) 3 Strands (t=1.25)4~5 Strands (t=1.15)6~10 Strands (t=1.00)8~10 Strands Plastic Filled (t=0.95)10+ Strands Rotation…

This free online crane dynamic loading calculator determines the actual design load acting on a crane structure and its mechanisms during operation. Rather than relying on static lifting weight alone, it applies a dynamic impact factor (Φ) to account for the additional forces generated by hoisting acceleration, braking inertia, drive vibration, and load swinging. The result — the dynamic load Pd — is the foundation for strength and deflection checks on main girders, end beam wheel pressure analysis, rail stress verification, and the selection and safety verification of motors, brakes, and other critical drive components. It supports structural design, fatigue life assessment, and safety certification of overhead cranes, gantry cranes, and port cranes in accordance with ISO, FEM, EN, and GB standards. Crane Dynamic Loading Calculator Input dynamic factor, rated load, hook mass, and trolley weight to calculate dynamic load Loading Parameters Dynamic Factor Φ 1.1 – Low speed / light duty / precision1.2 – Conventional industrial (light)1.25 – Conventional industrial (medium)1.3 – Conventional industrial (heavy)1.4 – Heavy duty / severe service1.5 – High impact / mill duty1.6 – Extreme…

This free online crane lifespan calculator evaluates the remaining working cycles available to a crane’s overall structure and mechanical components. It integrates two authoritative calculation methods drawn from ISO 4301-1 and ISO 12482: The calculator supports structural integrity assessment, maintenance planning, regulatory inspection preparation, and end-of-life decision-making for overhead cranes, gantry cranes, port cranes, jib cranes, and permanently installed tower cranes. Important: This calculator applies only to cranes with a permanent, fixed installation throughout their working life. It is not suitable for mobile cranes or relocatable tower cranes. Crane Lifespan Calculator for Remaining Service Cycle Calculate remaining service cycles for crane structures and mechanical components Method 1: By Working Class (A) Method 2: By U+Qp Class Design Full Load Cycles Cf A03 – 500A02 – 1,000A01 – 2,000A0 – 4,000A1 – 8,000A2 – 16,000A3 – 31,500A4 – 63,000A5 – 125,000A6 – 250,000A7 – 500,000A8 – 1,000,000 Please enter a valid number ISO 4301-1 Table 5 Safety Factor f1 f1 must be 1.0 to 1.5 ISO 12482 Table 1 Actual Consumed Cycles Ca Please enter a valid number Auto Calculate Ca…

Quickly assess wire rope wear and determine replacement timing – built to ISO 4309:2017 standards. Use this free online calculator to measure the diameter reduction rate of your crane hoist wire rope, automatically match the corresponding scrap level, and receive a clear action recommendation. No manual lookup tables. No guesswork. Just enter three values and get an instant compliance-ready assessment. Wire Rope Replacement Calculator Diameter wear assessment per ISO 4309:2017 Rope Parameters Wire Rope Type Single-layer rope with fibre core (FC)Single-layer rope with steel core (IWRC)Rotation-resistant rope Nominal Diameter d mm Please enter valid value > 0 Reference Diameter dref mm Please enter valid value > 0 Measured Diameter dm mm Please enter valid value > 0 Calculate & Assess Reset All d (nominal) dref dm Q = [(dref – dm) / d] × 100% ISO 4309:2017 Wire Rope Wear Assessment Diameter Reduction Q —% Damage Assessment Enter parameters and click Calculate. How the Calculator Works The assessment is based on the internationally recognized ISO 4309:2017 formula for diameter reduction: Q = [(dᵣₑf – dₘ) / d] x 100% Variable…

This free online crane hoist motor power calculator determines the required motor power for overhead crane and gantry crane hoisting mechanisms. Enter the rated lifting capacity, hoisting speed, and mechanical efficiency — and get the calculated motor power in kilowatts instantly. The calculator is compliant with major international crane design standards including ISO 4301, FEM 1.001 (European crane specifications), and GB/T 3811 (Chinese national standard). It covers duty classes A1–A6 (equivalent to M1–M6) and rated capacities from 0.5 t to 200 t under standard operating conditions. Crane Hoist Motor Power Calculator Calculate hoist motor power from lifting capacity, speed, and efficiency Motor Parameters Lifting Capacity ton Please enter a valid positive number Hoisting Speed m/min Please enter a valid positive number Mechanical Efficiency 0-1 Please enter a value between 0 and 1 Calculate P Reset All HOIST MOTOR Power P (kW) HOOK m (kg) v (m/s) hoisting speed P = m·g·v 1000·η g = 9.81 m/s² η = mechanical efficiency ISO 4301 / FEM 1.001 / GB/T 3811 Motor Power P —kW Calculation Detail Enter parameters and click Calculate. Calculation…

This free online crane duty classification calculator determines the appropriate working class for an overhead crane or gantry crane based on three operational parameters: maximum rated lifting capacity, most frequently lifted load, and crane usage frequency. The calculator outputs two parallel classifications simultaneously: Both classifications are derived from the same underlying load and utilization data, and the calculator cross-references the two systems automatically, eliminating the need for manual table lookups across standards. Correct duty classification is the starting point for every downstream engineering decision: motor selection, gearbox sizing, brake specification, structural fatigue assessment, wire rope selection, and component service life planning. An incorrect duty class — whether too low or too high — leads to either premature component failure or significant over-engineering cost. Crane Duty Classification Calculator Determine ISO A-class and FEM duty group from load spectrum and usage frequency Operating Parameters Max. Lifting Capacity ton Please enter a valid value (at least 0.01) Most Frequently Lifted Load ton Please enter a valid value (0 to rated capacity) Crane Usage Frequency U0 – Once per hourU4 – About once every…

This free online crane wheel load calculator computes the maximum and minimum wheel pressure (PMAX and PMIN) acting on each runway rail, based on the crane’s lifting capacity, trolley weight, crane self-weight, span, hook approach distances, and number of wheels. It also includes a built-in wheel diameter inspection tool that verifies whether the selected wheel diameter meets the allowable contact pressure limit for the chosen rail type and wheel material. Accurate wheel load calculation is the foundation for runway rail selection, runway beam design, wheel and axle specification, and end carriage structural verification. Underestimating wheel loads leads to premature rail wear, rail fastening failure, and runway beam fatigue cracking. Overestimating results in unnecessary structural cost. Crane Wheel Load Calculation Calculate maximum and minimum wheel pressure based on lifting capacity, trolley weight, crane span and wheel count Load Parameters Lifting Capacity ton Please enter a valid positive number Trolley Weight ton Please enter a valid positive number Crane Parameters Min Hook Distance m Please enter a valid positive number Crane Span m Please enter a valid positive number Total Crane Weight…

This free online jib crane deflection calculator estimates the total downward tip deflection of a cantilever jib beam under a lifted load, combining the bending of the horizontal cantilever arm and the lateral sway induced by column flexure. Enter the rated capacity, hoist weight, jib radius, column height, section properties, and safety factor — and get the calculated total deflection δ in millimetres instantly. The result is compared against the allowable deflection limits specified in ISO, FEM, and GB/T standards to confirm compliance. Excessive deflection causes load swinging, positioning inaccuracy, and permanent structural deformation. A significant gap between the calculated and observed deflection during inspection indicates overload, loose connection bolts, foundation movement, or structural damage — making this calculator a useful diagnostic tool as well as a design aid. Applicable crane types: free-standing pillar jib cranes, FEM standard jib cranes, and workstation jib cranes. Jib Crane Deflection Calculator Calculate total deflection of a jib crane under load, including cantilever beam bending and column deflection Load Parameters Safety Factor, k 1.00 – Normal static operation1.10 – Start/stop or VFD operation1.15 –…

The crane travelling static resistance calculator estimates the force required to overcome friction and track slope for normal travel. Using rated load and crane dead weight, it checks whether motors and drives can move the crane and trolley. Results support selection of matching motors, gearboxes, and wheels, and help assess wheel slip risk on sloped tracks to prevent bearing damage, rail biting, and installation-related faults. Calculation basis: EN 13135:2026 Scope: Steel wheels with roller bearings on steel rails Note: ISO 8686-1:2012 is not used for this equation. Crane Travelling Static Resistance Formula Crane Travelling Static Resistance Calculator Calculate crane and trolley travel static resistance from rated load, self mass, wheel rolling factor and uphill gradient Load & Site Parameters Rated Load, Gn kg Please enter a valid non-negative number Gravity, g N/kg Please enter a value between 0 and 20 Uphill Gradient, i ‰ Please enter a value between 0 and 100 Wheel Construction Flanged wheelsFlangeless wheels Crane & Trolley Parameters Crane Self Mass, G kg Please enter a valid positive number Trolley Self Mass, G1 kg Please enter a…