Explore 58 calculators
Search the ValiCalc toolkit or browse 9 engineering categories.
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Belts & Pulleys
Belt length, pulley ratio, RPM, center distance, belt speed, tension, frequency, and wrap-angle calculators for belt drives.
Belt Length Calculator
Calculate approximate open-belt length from pulley diameters and center distance, with metric and imperial results.
Pulley Ratio Calculator
Calculate belt-drive speed ratio from driver and driven pulley diameters.
Pulley RPM Calculator
Calculate driven pulley RPM from driver RPM and pulley diameters.
Pulley Diameter Calculator
Calculate the driven pulley diameter needed for a target RPM.
Belt Speed Calculator
Calculate belt linear speed from pulley diameter and rotational speed.
Belt Center Distance Calculator
Estimate pulley center distance from belt length and two pulley diameters.
Pulley Wrap Angle Calculator
Calculate approximate belt wrap angle on the small and large pulleys of an open belt drive.
Pulley Torque Ratio Calculator
Estimate ideal driven-shaft torque from input torque and driver/driven pulley diameters.
Belt Effective Tension Calculator
Calculate effective belt pull from transmitted mechanical power and belt linear speed.
Belt Power Calculator
Calculate mechanical power transferred by a belt from effective tension and belt speed.
Belt Frequency Tension Calculator
Estimate belt span tension from measured natural frequency, span length, and belt mass per unit length.
Belt Natural Frequency Calculator
Estimate belt span natural frequency from static tension, free span length, and belt mass per unit length.
Chains & Sprockets
Sprocket ratio, RPM, pitch diameter, chain speed, chain length, center distance, travel, and torque calculators for roller-chain drives.
Sprocket Ratio Calculator
Calculate chain-drive speed ratio from driver and driven sprocket tooth counts.
Sprocket RPM Calculator
Calculate driven sprocket RPM from driver RPM and sprocket tooth counts.
Sprocket Teeth Calculator
Estimate the driven sprocket tooth count needed for a target RPM.
Chain Speed Calculator
Calculate roller-chain linear speed from chain pitch, sprocket teeth, and RPM.
Chain Length Calculator
Estimate roller-chain length in pitches from sprocket teeth, center distance, and chain pitch.
Chain Center Distance Calculator
Calculate approximate shaft center distance from roller-chain pitch count and sprocket teeth.
Sprocket Pitch Diameter Calculator
Calculate roller-chain sprocket pitch circle diameter from chain pitch and sprocket tooth count.
Chain Travel per Revolution Calculator
Calculate how far roller chain advances for one sprocket revolution from pitch and tooth count.
Sprocket Torque Ratio Calculator
Estimate ideal driven-shaft torque from input torque and driver/driven sprocket tooth counts.
Power, Torque & Speed
Convert between mechanical power, shaft torque, rotational speed, force, and lever radius for workshop and drivetrain calculations.
Torque from Power and RPM Calculator
Calculate shaft torque from mechanical power and rotational speed.
Power from Torque and RPM Calculator
Calculate mechanical shaft power from torque and rotational speed.
RPM from Power and Torque Calculator
Calculate rotational speed from mechanical power and shaft torque.
Torque from Force and Radius Calculator
Calculate torque from tangential force and lever-arm radius with metric and imperial outputs.
Force from Torque and Radius Calculator
Calculate tangential force from shaft torque and effective radius with metric and imperial results.
Radius from Torque and Force Calculator
Calculate the effective lever radius required to produce a target tangential force from a known torque.
Gears
Spur-gear ratio, RPM, tooth count, module, pitch diameter, center distance, circular pitch, rack travel, torque, and pitch-line speed calculators.
Gear Ratio Calculator
Calculate ideal external gear ratio from driver and driven gear tooth counts.
Gear RPM Calculator
Calculate driven gear RPM from driver RPM and the tooth counts of a simple external gear pair.
Gear Teeth Calculator for Target RPM
Estimate the driven gear tooth count required to reach a target RPM from a known driver gear and speed.
Gear Pitch Diameter Calculator
Calculate standard metric spur-gear reference diameter from module and number of teeth.
Gear Module Calculator
Find the metric module that matches a measured or specified spur-gear reference diameter and tooth count.
Gear Center Distance Calculator
Calculate center distance for two standard external spur gears from module and tooth counts.
Gear Circular Pitch Calculator
Calculate circular pitch for a metric gear from module using the standard pi-times-module relationship.
Gear Outside Diameter Calculator
Calculate tip or outside diameter for a standard full-depth external metric spur gear.
Rack Travel per Pinion Revolution Calculator
Calculate rack linear travel per pinion revolution from spur-gear module and pinion tooth count.
Gear Pitch Line Velocity Calculator
Calculate spur-gear pitch-line velocity from reference diameter and rotational speed.
Gear Torque Ratio Calculator
Estimate ideal driven-shaft torque from input torque and driver/driven gear tooth counts.
Construction
Plan gravel, concrete slabs and paver layers with volume, order-unit rounding, material allowances and metric or imperial measurements.
Gravel Calculator
Estimate gravel volume, tonnes, US tons, bags and loads with editable density, waste and compaction. Calculate coverage from a known quantity.
Concrete Slab Calculator
Calculate rectangular or circular slab concrete in m³, yd³ and ft³, whole bags, cost and reverse coverage using an editable product yield.
Paver Calculator
Estimate paver pieces with joints and waste, gravel base, bedding sand and edging length. Plan the complete layer stack in metric or imperial units.
Plumbing & Fluid
Connect actual pipe bore and flow with water friction, pump total dynamic head and drainage gradients using explicit assumptions and unit conversions.
Pipe Diameter Calculator
Solve pipe inside diameter, flow or mean velocity from Q = A × v. Convert L/s, L/min, m³/h, US GPM, CFM and metric or imperial pipe dimensions.
Drainage Slope Calculator
Calculate drainage slope, fall, run or ending elevation. Compare percent, 1:X, mm/m, cm/m, in/ft and degrees with a run-and-fall diagram.
Hazen-Williams Calculator
Solve water-pipe friction head loss, pressure loss, flow or inside diameter using Hazen-Williams with editable C-factor and metric or imperial units.
Pump TDH Calculator
Estimate pump total dynamic head, pipe and fitting losses, pressure head and hydraulic power with editable fluid properties and metric or imperial units.
Electrical
Estimate resistive cable voltage drop, conductor area and one-way route length with temperature correction and clearly stated model limitations.
HVAC & Energy
Estimate heating loss, screen mini-split capacity, compare duct airflow and friction, plan loose-fill insulation and model heat-pump running cost.
Blown-In Insulation Calculator
Calculate blown-in insulation bags, installed and settled depth, coverage and cost from a manufacturer label, with metric and imperial measurements.
Heat Loss Calculator
Estimate room or building heating loss from repeatable surface areas, U- or R-values, outdoor air changes and design temperatures in metric or imperial units.
Mini-Split Size Calculator
Screen mini-split cooling capacity from room area and stated adjustments, or compare known heating and cooling loads with nominal BTU sizes.
Duct Size Calculator
Size round or rectangular ducts by airflow, velocity or straight-duct friction rate; reverse known dimensions to CFM with editable air properties.
Heat Pump Running Cost Calculator
Estimate heat-pump kWh, annual and average monthly running cost from heat demand or runtime, editable COP/SCOP, tariff and auxiliary electricity.
Freight & Logistics
Connect carton volume, pallet and container layouts with air chargeable weight, ocean W/M and road loading metres using explicit carrier conventions.
Multiple-Carton CBM Calculator
Add mixed-size carton rows to calculate CBM per carton and row, total m³ and ft³, carton count, shipment weight and density with mixed units.
Cartons per Pallet Calculator
Compare grid, rotation and two-block carton layouts. Estimate TI/HI, loaded height, payload, gross weight, pallets required and unused capacity.
Air Freight Chargeable Weight Calculator
Compare actual, volumetric and chargeable air-freight weight across carton rows with mixed units, editable divisors, rounding rules and optional rate.
Pallets per Container Calculator
Estimate pallets per container with rotated and split floor layouts, loaded height, door aperture, stacking and payload limits plus a top-view plan.
Loading Meter Calculator
Estimate road-freight loading metres from cargo footprints, quantities and confirmed stack counts with editable trailer width and metric or imperial units.
Ocean Freight W/M Calculator
Compare LCL ocean freight weight and measure revenue tons from shipment totals or carton rows, with editable tariff ratios, rounding, minimums and rates.
Container Loading Calculator
Plan mixed cartons in a container with a bounded 3D packing heuristic, editable equipment, door and payload limits, orientations and a visual preview.