Free Calculators.
Built on MetaModel.

Hollow-metal door configurator: single or pair, gauge, core, vision lites and hardware — hinge counts by height rule, conditional panic bars, live 3D, and a table-driven price.

Engineer-to-order hydraulic cylinder: bore, stroke and pressure drive rod buckling, wall thickness and seal selection — and the mounting style physically reconfigures the 3D model. (v1.2: real mass-based costing — quote model on page 2, margin health indicator, costed BOM quote sheet)

Compressed-air filtration on KELTEC Technolab published data: train sizing with pressure correction and smallest-fit housing selection, plus a custom air-oil separator spec builder with live 3D and nearest-standard-part match.

One complete belt conveyor section — rollers auto-place per pitch, the IEC motor is selected live, and the 3D scene rebuilds as you stretch it. (v1.2: belt+idler mass, cos δ, acceleration term, service-factor motor sizing, two-sided utilization)

One complete belt conveyor section — rollers auto-place per pitch, the IEC motor is selected live, and the 3D scene rebuilds as you stretch it. (v1.1: stringers centered under the belt)

One complete belt conveyor section — rollers auto-place per pitch, the IEC motor is selected live, and the 3D scene rebuilds as you stretch it.

Assemble a belt conveyor from sections — per-section belt pull, live totals, and automatic motor selection from the IEC ladder.

Multi-room paint estimator with brand/quality paint lookup table, labor cost estimate, and profit margin analysis

Meerdere dakvlakken — elk met eigen oriëntatie, panelen en schaduw. Wat leveren zonnepanelen op na het einde van de salderingsregeling (1 januari 2027)? Onafhankelijke berekening met batterij- en contractscenario's.

Estimate fountain water loss from evaporation physics (surface area, water temp, wind, humidity) and how often to top off the reservoir. Built by Steve Strong.

Wat leveren zonnepanelen op na het einde van de salderingsregeling (1 januari 2027)? Onafhankelijke berekening met batterij- en contractscenario's.

Structural engineering calculator for beam deflection and bending stress analysis with material properties

Calculate shaft surface speeds for high-speed machining in both metric and imperial units

Design calculator for a 3-gear compound gear train optimizing dimensions, tooth count, and performance for given ratio and input torque

Convert between different energy units using scientific conversion factors

Industrial filtration system design tool for sizing components, calculating quantities, and generating cost proposals

Calculate wall thickness, stress verification, and MAWP for cylindrical pressure vessels per ASME BPVC Section VIII Division 1

5 geometric volume calculators with SVG diagrams

Size residential and light commercial HVAC ducts using the Equal Friction Method per ACCA Manual D

Portfolio rebalancing system with risk monitoring and automatic hedge recommendations

Complete building engineering calculator. Enter room dimensions to auto-size HVAC, electrical, and lighting systems with full cost estimation.

Calculate recommended Motrin (Ibuprofen) dosage based on patient weight, age group, and health factors. Includes safety warnings and dose adjustments.