Precision sizing tools powered by physical constants, engineering equations and official standards (NFPA 70 NEC, IEC 60364, ASHRAE, ASTM & IBC).
Advanced engineering scientific calculator, solar photovoltaic array sizing, EV charging time and energy ROI:
Scientific station with DEG/RAD trigonometry, physical constants, HEX/BIN bases, SI prefixes and history tape.
Photovoltaic solar array sizing (kWp), number of panels and inverter rating based on Peak Sun Hours (PSH).
Electric car charging time, cost per 100 km and range gained per hour for home Wallbox and DC fast chargers.
Financial payback period, annual ROI % and 25-year net energy savings including utility inflation and tax rebates.
Wire sizing by voltage drop, AWG to mm² conversion, OCPD circuit breaker sizing, solar battery banks and kWh cost:
Conductor sizing in DC (solar/RV) and single/three-phase AC with thermal ampacity and voltage drop check.
Exact conversion between North American ASTM B258 (AWG) wire gauge and European IEC 60228 metric cross-section.
Overcurrent protection device (OCPD) sizing in Amps, trip curve selection and residual current device (RCD/GFCI) coordination.
Off-grid solar, RV and camper battery bank sizing for Lithium (LiFePO4) and AGM/Gel lead-acid chemistries.
Exact energy consumption in kilowatt-hours (kWh) and cost estimation for household appliances and industrial equipment.
Cooling load in BTU/h and kW, radiator output sizing, mechanical ventilation airflow (m³/h & l/s) and heat pump SCOP:
Thermal cooling load sizing for Split AC and ducted heat pumps in BTU/h, kW and frigories/h.
Room heat loss calculation and radiator section sizing for standard boilers (ΔT 50°C) and low-temperature heat pumps (ΔT 30°C).
Air changes per hour (ACH), airflow rate and low-noise duct diameter calculation.
Effective cost per useful thermal kWh, annual savings and efficiency comparison between heat pumps and boilers.
Thermodynamic heating time in hours/minutes, kWh energy required and mixed shower water volume at 38°C.
Drywall sheets and steel studs, mortar and concrete bags, flooring boxes with waste factor, paint liters and ADA slope:
Complete bill of materials for drywall partitions, wall linings and suspended ceilings with stud spacing options.
Volumetric calculation in cubic meters (m³), total dry weight in kg and 25 kg commercial bags with waste margin.
Full box rounding, total coverage area, straight vs. diagonal (45°) waste allowance and skirting boards.
Net paintable area calculation, total liters by coverage rate (m²/L), primer estimation and commercial bucket breakdown.
Trigonometric conversion between slope %, angle (°), drop per meter (cm/m) and true inclined ramp length.
All UnlimitCalc tools apply verified electrotechnical, thermodynamic and civil engineering equations: