Appliance Load Calculator
Estimate appliance load and current from row-level VA, quantity, demand factors, continuous multipliers, voltage, phase, and an entered comparison capacity. The result does not apply dwelling, dryer, range, branch-circuit, or service demand rules.
- Connected appliance load
- VA
- Demand appliance load
- VA
- Continuous adder
- VA
- Adjusted appliance load
- VA
- Appliance current
- A
- Entered capacity margin
- A
- Largest row load
- VA
- Effective demand factor
- %
- Counted appliances
- count
- Counted appliance rows
- rows
- Phase multiplier
- x
Calculation details
- Calculation basis
- Selection boundary
Recent results
Formulas
- \(N=\text{quantity},\quad \mathrm{VA}_{\mathrm{each}}=\text{VA per appliance},\quad F_{\mathrm{demand}}=\text{demand factor percent},\quad F_{\mathrm{continuous}}=\text{continuous multiplier percent}\)
- \(V=\text{system voltage},\quad m_{\mathrm{phase}}=1\text{ for single-phase or }\sqrt{3}\text{ for balanced three-phase}\)
- \(\mathrm{Connected\ VA}_{\mathrm{row}} = N \times \mathrm{VA}_{\mathrm{each}}\)
- \(\mathrm{Demand\ VA}_{\mathrm{row}} = \mathrm{Connected\ VA}_{\mathrm{row}} \times \frac{F_{\mathrm{demand}}}{100}\)
- \(\mathrm{Continuous\ adder}_{\mathrm{row}} = \mathrm{Demand\ VA}_{\mathrm{row}} \times \left(\frac{F_{\mathrm{continuous}}}{100} - 1\right)\)
- \(\mathrm{Adjusted\ VA} = \sum \mathrm{Demand\ VA}_{\mathrm{row}} + \sum \mathrm{Continuous\ adder}_{\mathrm{row}}\)
- \(I = \frac{\mathrm{Adjusted\ VA}}{m_{\mathrm{phase}} \times V}\)
- \(\mathrm{Effective\ demand\ percent} = \frac{\mathrm{Adjusted\ VA}}{\mathrm{Connected\ VA}} \times 100\%\)
Related tools: Demand Factor Estimate, Electrical Panel Load Calculator, and Residential Load Calculator.
An appliance load calculation converts row-level appliance VA into an adjusted load and corresponding current. The result supports preliminary branch-circuit, feeder, panel, and service review when the row assumptions, voltage, phase, and comparison capacity are documented.
The calculation begins with the installed or connected appliance nameplate load. It then applies the entered Demand factor and Continuous multiplier to each appliance row. The resulting adjusted VA is converted to amperes using the selected voltage and phase method.
For a preliminary load review, the calculated current can be compared with an existing or proposed circuit, feeder, or panel value entered as Entered capacity. The calculator reports the remaining or exceeded ampere value as Entered capacity margin.
Appliance Load Inputs
Each appliance or appliance group is entered as a separate row under Appliance rows.
| Field | Electrical use |
|---|---|
| Label | Identifies the appliance or appliance group being included in the load calculation |
| Quantity (count) | Number of identical appliances or required appliance-load units represented by the row |
| VA each (VA) | Apparent power assigned to one appliance or unit |
| Demand factor (%) | User-entered percentage applied to the connected VA for that row |
| Continuous multiplier (%) | User-entered multiplier that adds load above the demand-adjusted VA when applicable |
| System voltage (V) | Nominal voltage used to convert adjusted VA into amperes |
| Phase | Selects single-phase or balanced three-phase current math |
| Entered capacity (A) | Ampere value used only for comparison with the calculated Appliance current |
The appliance rows support grouped entries. For example, Small appliance group may be entered with a Quantity of 2 and a VA each value of 1500 VA, rather than creating two separate 1,500 VA rows.
The Demand factor and Continuous multiplier are assumptions entered for each row. They are not automatic dwelling-load-method selections and do not replace the applicable code calculation, equipment instructions, or engineered load determination.
Load and Current Formula
For each appliance row:
\(\displaystyle \mathrm{Connected\ VA} = \mathrm{Quantity} \times \mathrm{VA\ each}\)
\(\displaystyle \mathrm{Demand\ VA} = \mathrm{Connected\ VA} \times \frac{\mathrm{Demand\ factor}}{100}\)
\(\displaystyle \mathrm{Continuous\ adder\ VA} = \mathrm{Demand\ VA} \times \frac{\mathrm{Continuous\ multiplier} - 100}{100}\)
\(\displaystyle \mathrm{Adjusted\ VA} = \mathrm{Demand\ VA} + \mathrm{Continuous\ adder\ VA}\)
The calculator totals the rows as follows:
\(\displaystyle \mathrm{Connected\ appliance\ load} = \sum \mathrm{Connected\ VA}\)
\(\displaystyle \mathrm{Demand\ appliance\ load} = \sum \mathrm{Demand\ VA}\)
\(\displaystyle \mathrm{Continuous\ adder} = \sum \mathrm{Continuous\ adder\ VA}\)
\(\displaystyle \mathrm{Adjusted\ appliance\ load} = \mathrm{Demand\ appliance\ load} + \mathrm{Continuous\ adder}\)
For Single-phase systems:
\(\displaystyle I = \frac{\mathrm{Adjusted\ appliance\ load}}{V}\)
For balanced three-phase systems:
\(\displaystyle I = \frac{\mathrm{Adjusted\ appliance\ load}}{\sqrt{3} \times V}\)
The capacity comparison is:
\(\displaystyle \mathrm{Capacity\ margin} = \mathrm{Entered\ capacity} - I\)
A positive margin means the entered ampere value exceeds the calculated appliance current. A negative margin means the calculated current exceeds that comparison value.
Calculation Example
The following appliance rows use a 240 V, Single-phase system and an Entered capacity of 40 A.
| Label | Quantity | VA each | Demand factor | Continuous multiplier | Connected VA | Demand VA |
|---|---|---|---|---|---|---|
| Dishwasher | 1 | 1,200 VA | 100% | 100% | 1,200 VA | 1,200 VA |
| Disposal | 1 | 840 VA | 100% | 100% | 840 VA | 840 VA |
| Laundry | 1 | 1,500 VA | 100% | 100% | 1,500 VA | 1,500 VA |
| Small appliance group | 2 | 1,500 VA | 75% | 100% | 3,000 VA | 2,250 VA |
\(\displaystyle \mathrm{Connected\ appliance\ load} = 1{,}200 + 840 + 1{,}500 + 3{,}000 = 6{,}540\ \mathrm{VA}\)
\(\displaystyle \mathrm{Demand\ appliance\ load} = 1{,}200 + 840 + 1{,}500 + 2{,}250 = 5{,}790\ \mathrm{VA}\)
Every row uses a Continuous multiplier of 100%, so:
\(\displaystyle \mathrm{Continuous\ adder} = 0\ \mathrm{VA}\)
\(\displaystyle \mathrm{Adjusted\ appliance\ load} = 5{,}790 + 0 = 5{,}790\ \mathrm{VA}\)
\(\displaystyle I = \frac{5{,}790}{240} = 24.125\ \mathrm{A}\)
\(\displaystyle \mathrm{Capacity\ margin} = 40 - 24.125 = 15.875\ \mathrm{A}\)
The calculated appliance portion is 24.125 A at 240 V single-phase, leaving 15.875 A relative to the entered 40 A comparison value.
Field Verification
The calculated Appliance current is a load arithmetic result. It does not, by itself, establish the minimum conductor size, overcurrent protective device rating, panel rating, feeder rating, or service capacity.
Verify the installation separately before selecting AWG or kcmil conductors, including:
- Applicable load-calculation rules and whether the entered demand assumptions are permitted for the installation
- Appliance nameplate ratings, voltage, phase, minimum circuit ampacity, maximum overcurrent protection, and manufacturer installation instructions
- Whether a load qualifies as continuous and whether the entered Continuous multiplier reflects the required design treatment
- Branch-circuit and feeder loads not represented in the appliance rows
- Conductor ampacity after applicable adjustment factor and correction factor calculations
- Terminal rating, insulation temperature rating, conductor material, and listed equipment limitations
- Current-carrying conductors in the raceway, raceway fill, ambient temperature, and termination conditions
- Voltage-drop design for long branch circuits or feeders
- Motor loads, starting current, and any motor-specific calculation requirements
- Local amendments, utility requirements, engineered drawings, and AHJ interpretation
Use the Entered capacity result as a comparison, not as a conductor or breaker selection. Final circuit, feeder, and service decisions require the complete installation load and the applicable electrical code requirements.
For a broader residential load schedule, compare these appliance rows with the Residential Load Calculator and keep the row assumptions documented.
Related calculators
Continue with nearby calculators for the same equipment, formula, or field task.
FAQs
Does this calculate dwelling appliance demand?
No. You enter the appliance rows and demand factors. This page only performs transparent row arithmetic.
Can I include dryers or ranges here?
You can enter any user-defined row for planning arithmetic, but dryer and range demand rules need separate code review.
Can this size a circuit or service?
No. It estimates appliance load and compares it with an entered ampere value. Final circuit, feeder, or service sizing needs adopted-code and equipment review.