House Electrical Wiring Calculator

Calculation details

Update the example values below.

Units

01Measurements

Calculate using

Built-up area

ft²

Point density presetEditable planning examples. These do not specify electrical loads or wire sizing.

02Material detailsSizes, quantities and editable allowances.

These are editable purchasing examples, not electrical specifications. Enter conductor allowances and protection counts supplied by your electrician.

Points per 100 ft²

points

1.0 sq mm · conductor allowance

m / point

Total single-core metres for this gauge, including allocated neutral/earth. Set 0 if unused.

1.0 sq mm · coil length

m / coil

1.5 sq mm · conductor allowance

m / point

Total single-core metres for this gauge, including allocated neutral/earth. Set 0 if unused.

1.5 sq mm · coil length

m / coil

2.5 sq mm · conductor allowance

m / point

Total single-core metres for this gauge, including allocated neutral/earth. Set 0 if unused.

2.5 sq mm · coil length

m / coil

4.0 sq mm · conductor allowance

m / point

Total single-core metres for this gauge, including allocated neutral/earth. Set 0 if unused.

4.0 sq mm · coil length

m / coil

Conduit length allowance

m / point

Conduit pipe length

m / pipe

Wire and conduit allowance

Points per modular switchboard

points

MCB purchase allowance

items

Enter a purchasing count from your electrician. This does not determine circuits, ratings or required protection.

03Rates (optional)Use reference rates or your local quote.

Illustrative market baseline — edit to match your local dealer quote. Reference dated 29 Oct 2026; not live prices.

Leave blank for quantities only. Use 0 only for costs included elsewhere or free. Reference rates are editable examples, not dealer quotes.

1.0 sq mm wire coil rate

INR / coil

1.5 sq mm wire coil rate

INR / coil

2.5 sq mm wire coil rate

INR / coil

4.0 sq mm wire coil rate

INR / coil

Conduit pipe rate

INR / pipe

Complete modular switchboard allowance

INR / board

MCB allowance rate

INR / item

Wiring labour rate

INR / point

How this is worked out

Check the formulas, allowances and scope before buying.

From measurements to materials

Area mode: points = rounded-up(built-up ft² ÷ 100 × points per 100 ft²). Room mode: sum(room count × editable points per room), then round up.

Standard and Heavy are illustrative point-density presets, not wiring standards. Standard starts at 5 points/100 ft²; Heavy at 7.5. Room allowances are shown in Material details.

For each gauge: conductor metres = points × entered metres per point × (1 + allowance/100). Each allowance is the total single-core conductor length, including any phase, neutral and earth conductors allocated to that gauge; do not multiply by three again.

Coils = conductor metres ÷ entered coil length, rounded up independently for each gauge. Defaults are 90 m coils. Split by colour and circuit before purchasing; separate colour coils can increase the total.

Conduit metres = points × conduit allowance per point × (1 + allowance/100). Divide by pipe length and round up. Boards = points ÷ points per board, rounded up. The MCB count is your editable purchase allowance.

Wire cost uses whole coils, conduit cost uses whole pipes, board/MCB costs use counts, and labour uses the estimated points. Only entered rates are included.

Assumptions to check

Rough purchasing budget only. Area and room counts do not determine actual routes, wire gauges, load capacity, circuit count or breaker ratings. Have a qualified electrician supply the design and final takeoff.

The MCB allowance does not specify a safe circuit schedule or protective arrangement. Distribution board enclosure, RCCB/RCBO, earthing system, mains/service cable, fittings, chasing, testing, fixtures and appliances are excluded unless explicitly included in your entered rates.