28 calculators live · first design free

MEP calculations you can defend.

Electrical, HVAC, plumbing and fire fighting. Every result with its formula, its clause and a PASS / CHECK against the code limit, then the report, the Excel with live formulas, the DXF and the 3D model.

Start calculating Power distribution design
110+
standards cited line by line
4
outputs per design: report, Excel, DXF, 3D
IS · NBC · NFPA
Indian and international codes
Try it now

Cable sizing in one glance.

Enter the load, the run and the voltage. The card picks the smallest copper XLPE cable that carries the current and keeps voltage drop under 3 %. The full tool adds derating, grouping, cascade limits, breaker coordination and the BOQ.

Open the voltage-drop tool
Voltage drop · quick check
Seven disciplines

Every calculator is a complete design step.

What you take away

One calculation, four deliverables.

ReportInputs, results with basis, checks, worked example and the standards list. Print to PDF and submit.
Excel with live formulasE20 sheets, STP and UGT design sheets, cable schedules and BOQs. Cells stay editable.
DXF drawingSLD, GA with sections, P&ID, roof LPS, PV array, plant rooms, L-sections. In millimetres, on layers.
3D modelOrbit the tank farm or plant room in the browser. Click an object for its size.
How results are checked

Built for the review table.

01 · FORMULA + CLAUSE

Every line shows where it came from

The equation, the substituted values and the clause: W = V/s · C/(100−C) NFPA 2001 §5.5, IEC 62305-2 A.2, CPHEEO Table 5.8, NBC Table 7.

02 · CHECKS

PASS / CHECK against the limit

Voltage drop ≤ 3 %, concentration ≤ NOAEL, filtration ≤ 25 m/h, string Voc ≤ inverter max. Each check names the limit and what to change when it fails.

03 · GATED

Reproduces reference designs

Engines are pinned to worked references and re-tested on every release. See the full sample report before you pay.

04 · ONE REGIME

Indian or international, never mixed

Pick the code regime once per project. International projects cite IEC, NFPA, ASHRAE and BS EN only; Indian projects cite IS, NBC, CPHEEO and CPWD.

Pay per design, or go unlimited.

₹199 a design with every output and 30 days of re-runs. Packs of 10 and 50. Unlimited from ₹2,999 a month with the AutoCAD / ZWCAD plugin. Free for every user of a DesignLink company.

Free online MEP design calculators — electrical, HVAC, plumbing, fire fighting, ELV

Every calculator runs free in the browser with the formula and the code clause on each line, PASS / CHECK against the limit, and exports the report, Excel and DXF. Indian codes (NBC 2016, IS, CPWD, ECBC) or international (IEC, NFPA, ASHRAE, EN) on every tool.

Electrical calculators

HVAC calculators

Plumbing / PHE calculators

Fire fighting calculators

Building model calculators

Automation / ELV calculators

Structure & architecture calculators