MEP Calculator
Engineering calculators for plumbing, HVAC and mechanical systems.
Sanitary
Hydraulics
Darcy-Weisbach Head Loss Calculator
Calculates pipe head loss automatically using flow rate, diameter, and length.
Pipe DN Recommendation
Recommends optimal pipe diameter based on flow rate and system type.
Fire Protection System Calculator
Complete fire protection system design including fire cabinets, hydrants, automatic sprinklers, pump selection, and tank sizing. Generates compliance reports for NFPA, EN, and TS standards.
Flow Velocity Calculator
Calculates fluid velocity based on volumetric flow rate and pipe internal diameter.
Friction Factor Calculator
Calculates Darcy friction factor using Reynolds number, pipe diameter, and pipe roughness.
Gravity Drainage Calculator
Calculates gravity sewer and drainage pipe flow using Manning's Equation for partially full circular pipes. Validates velocity (0.6-3.0 m/s), fill ratio (<100%), and provides pipe size alternatives for optimal design.
Hydraulic System Analysis
Analyzes hydraulic performance of piping systems with multiple segments. Calculates head loss, velocity, and checks capacity for both pressurized and gravity flow systems. Includes elevation difference calculations for complete pump load analysis.
Pipe Diameter Calculator
Calculates the optimal commercial pipe diameter for a given flow rate and target velocity, ensuring efficient fluid transport with minimal energy loss.
Pipe Flow Rate Calculator
Calculates volumetric flow rate in a pipe based on fluid velocity and pipe diameter using the continuity equation.
Pressure Loss & Pump Selection
Calculates pressure loss using Darcy-Weisbach equation and generates system curve for pump selection. Provides technical criteria for optimal pump sizing without requiring pump database.
Pump Power Calculator
Calculates required pump motor power based on flow rate, head, fluid density, and pump efficiency. Includes energy loss analysis and annual operating cost estimation.
Pump Selection Calculator
Recommends real Grundfos pump models for your required flow and head from a catalog of 199 pumps with actual performance curves. Covers heating/cooling circulation, domestic hot water, and pressure boosting (hydrofor) duties, with automatic multi-pump (parallel/series) suggestions when no single pump fits.
Rainwater Flow Calculator
Calculates stormwater runoff flow using the Rational Method (Q = CiA) with automatic pipe sizing using Manning's equation. Supports building, site, and infrastructure scales with automatic slope optimization for excavation depth minimization.
Reynolds Number Calculator
Calculates Reynolds number for pipe flow.
Roof Drainage Calculator
Gravity roof drainage design per EN 12056-3. Calculates design flow rate, minimum drain points, and recommended pipe sizes for vertical stacks and horizontal collectors.
System Curve Calculator
Generates the system curve (H-Q curve) for pump selection and hydraulic system analysis. Shows the relationship between flow rate and total head required, including static head and friction losses.
HVAC / Thermal
Air Handling Unit (AHU) Calculator
Calculate AHU heating/cooling coil capacities, supply air conditions, fan power, and specific fan power for HVAC air handling systems. Supports mixing, heating, cooling, and humidification processes.
Boiler / Heating Capacity Calculator
Calculate boiler capacity, fuel consumption, water flow rate, and operating costs for heating systems. Supports condensing, non-condensing, and electric boilers with natural gas, diesel, LPG, and electricity.
Chiller Capacity Calculator
Chiller sizing and energy analysis for HVAC applications. Calculates required cooling capacity, power consumption, and flow rates based on building load and operating conditions.
Cooling Tower Selection
Cooling tower sizing and selection for HVAC and industrial applications. Calculates required airflow, water flow rates, and fan power based on thermal load and ambient conditions.
Energy Recovery Ventilator (ERV) Calculator
Calculate sensible, latent, and total energy recovery from ventilation air streams. Determine energy savings, CO₂ reduction, payback period, and supply air conditions after heat and humidity recovery.
Fan Curve Calculator
Fits a quadratic performance curve (P = a − b×Q²) through two vendor-supplied points (low flow/high pressure and high flow/low pressure) and checks whether the offered fan meets the designer's required duty point. Use for Roof/Centrifugal exhaust fans and Axial fans (SPF – Stair Pressurization Fan, EPF – Elevator/Lobby Pressurization Fan, SEF – Smoke Exhaust Fan).
Room Heat Loss & Gain
Comprehensive heating and cooling load calculations for building rooms based on ASHRAE fundamentals. Analyzes both winter heat loss and summer heat gain scenarios.
Pipe Insulation Calculator
Calculate heat loss/gain through insulated pipes, surface temperature, condensation risk, and optimal insulation thickness. Supports hot water heating pipes, chilled water cooling pipes, and process piping with various insulation materials.
Plate Heat Exchanger
Design and sizing calculations for gasketed plate heat exchangers used in HVAC heating, cooling, and heat recovery applications.
Ventilation Duct Sizing
Air duct sizing and pressure drop calculations for HVAC ventilation systems. Supports rectangular and circular ducts with automatic air density correction.
Civil / Infrastructure
Cast-in-Situ Manhole Material Quantity
Computes concrete volume, weight, and formwork area for a cast-in-situ manhole - where the top slab is poured together with the walls in one operation, so it's included in the manhole's own total weight (not lifted separately).
Cast-in-Situ Manhole Reinforcement Table
Generates a full reinforcement schedule (bar mark, diameter, count, length, weight) for a cast-in-situ manhole across 9 standard positions (P1-P9): bottom slab bars, wall verticals and horizontals, top slab bars, and opening trimmer bars.
Manhole Concrete Casting Quantity
Computes the concrete volume (m³) and weight (TON) required to cast a rectangular manhole - top slab, wall, bottom slab, and blinding - from the manhole's outer and opening dimensions. Quick quantity takeoff for costing and material ordering.
Precast Manhole Material Quantity
Computes concrete volume, weight, and formwork area for a precast manhole - where the top slab is cast separately and lifted into place. Manhole body weight and slab weight are reported separately since both are critical, independent lifting weights for crane selection.
Precast Manhole Reinforcement Table
Generates a full reinforcement schedule (bar mark, diameter, count, length, weight) for a precast manhole across 11 standard positions (P1-P11): bottom slab bars, wall verticals and horizontals, and precast top slab bars including opening trimmer bars.
Trust Block (Thrust Block) Calculator
Computes the resultant thrust force at one or more buried pressure pipes that all undergo the same directional change (45° elbow, 90° elbow, tee, or dead-end/cap) at the same thrust block, and the concrete bearing area needed to resist the combined force. Add as many pipes as needed.
Converters
Area Converter
Convert between engineering area units.
Density Converter
Convert between density units used in fluid mechanics and HVAC calculations.
Energy Converter
Convert between energy units used in thermal calculations and HVAC systems.
Flow Rate Converter
Convert between common flow rate units used in plumbing, HVAC and hydraulic systems.
Heat Transfer Coefficient Converter
Convert between heat transfer coefficient units used in thermal engineering and HVAC design.
Length Converter
Convert between engineering length units.
Mass Converter
Convert between mass and weight units used in engineering calculations.
Power Converter
Convert between power units used in pump sizing, HVAC equipment, and electrical systems.
Pressure Converter
Convert between pressure units used in HVAC and plumbing systems.
Specific Heat Converter
Convert between specific heat capacity units used in thermal calculations.
Temperature Converter
Convert between temperature units used in HVAC and process engineering.
Velocity Converter
Convert between velocity and speed units used in fluid dynamics and HVAC systems.
Viscosity Converter
Convert between dynamic viscosity units used in fluid flow calculations.
Volume Converter
Convert between volume units used in tank sizing and capacity calculations.