Free calculators
Electrical calculators
Ohm's law, load, wire sizing, voltage drop and energy cost.
51 calculators
Electrical Job Profit
Panel upgrades, EV chargers, rewires and service calls all behave differently.
Ohm's Law Calculator
Solve any part of Ohm's law (voltage, current, resistance or power) from the two values you know..
Watt Calculator
Calculate power in watts from voltage and current, for single-phase or three-phase circuits..
Amp Calculator
Convert watts to amps for single-phase or three-phase circuits, and check it against a breaker..
Voltage Calculator
Calculate voltage from power and current, or from current and resistance..
Voltage Drop Calculator
Calculate voltage drop over a conductor run and check it against the recommended limit..
Wire Size Calculator
Estimate the conductor size a load needs, checked against both ampacity and voltage drop..
Breaker Size Calculator
Work out the overcurrent protection a load needs, using the 125% continuous-load rule..
Electrical Load Calculator
Estimate a dwelling's electrical load and the service size it points to, using the NEC standard method..
kWh Calculator
Convert an appliance's wattage and run time into kilowatt-hours of energy use..
Electricity Cost
Work out what any appliance or piece of equipment costs to run..
Generator Size Calculator
Size a generator from running load plus the surge that motor-driven equipment demands at start-up..
Wire Size
Wire gauge for a given load, with the continuous-load uplift and voltage drop both taken into account..
Breaker Size
The breaker size for a load, including the 125% uplift a continuous load requires..
Amps to Watts
Convert amps to watts for DC, single-phase and three-phase, with power factor..
Watts to Amps
Convert watts to amps for DC, single-phase and three-phase circuits..
Ohm's Law
Solve for voltage, current, resistance or power from any two of them..
Voltage Drop
Voltage drop over a run, and whether it stays inside the 3% that branch circuits should hold to..
Wire Ampacity
How much current a conductor can carry, after temperature and conductor-count derating..
Electrical Repair Cost
Estimate what a electrical repair costs, broken into labour, parts and the call-out..
Electrical Repair Cost
Estimate what a electrical repair costs, broken into labour, parts and the call-out..
Electrical Repair Cost
Estimate what a electrical repair costs, broken into labour, parts and the call-out..
Electrical Net Profit
What a electrical business keeps after both the cost of the work and the cost of running the company..
Electrical Repair Revenue
What the repair side of a electrical business brings in, and what it actually earns after the cost of delivering it..
Electrical Break-Even
How much electrical work you need each month before the business starts making money..
Electrical Overhead
Add up what a electrical business costs to run before a single job is done, and what that is as a share of revenue..
Electrical Overhead
Add up what a electrical business costs to run before a single job is done, and what that is as a share of revenue..
Electrical Payroll
What a electrical employee really costs once burden, overtime and unbillable hours are counted..
Electrical Productivity
How much of a paid technician day actually reaches an invoice, and what the rest is costing..
Electrical Productivity
How much of a paid technician day actually reaches an invoice, and what the rest is costing..
Electrical Acquisition Cost
What it costs a electrical business to win one customer, and whether the first job covers it..
Electrical Customer Value
What a electrical customer is worth across the whole relationship, not just the first job..
Electrical Lead Value
What one electrical enquiry is worth, and therefore the most you can sensibly pay for one..
Electrical Close Rate
Your electrical close rate, and what one more point of it is worth in revenue..
Electrical Conversion Rate
How many electrical enquiries turn into booked work, at each step from call to job..
Electrical Average Ticket
Your average electrical invoice, and what a small lift in it is worth across a year..
Revenue Per Tech
What each tech produces in a electrical business, and what one more would be worth..
Electrical Recurring Revenue
What a book of electrical agreements is worth, including the repair work members bring back..
Electrical Repair Revenue
What the repair side of a electrical business brings in, and what it actually earns after the cost of delivering it..
Electrical Repair Revenue
What the repair side of a electrical business brings in, and what it actually earns after the cost of delivering it..
Electrical Repair Revenue
What the repair side of a electrical business brings in, and what it actually earns after the cost of delivering it..
Electrical Markup
Turn a electrical job cost into a price at the markup you want, and see the margin that markup actually produces..
Electrical Markup
Turn a electrical job cost into a price at the markup you want, and see the margin that markup actually produces..
Electrical Gross Profit
What is left on electrical work after the direct cost of delivering it, before overhead..
Electrical Net Profit
What a electrical business keeps after both the cost of the work and the cost of running the company..
Electrical Cash Flow
What actually lands in the bank each month once electrical customers pay at the speed they really pay..
Electrical Pricing
Price a electrical job from what it costs you to deliver, with overhead and your target margin both accounted for..
Electrical Productivity
How much of a paid technician day actually reaches an invoice, and what the rest is costing..
Electrical Productivity
How much of a paid technician day actually reaches an invoice, and what the rest is costing..
Electrical Gross Profit
What is left on electrical work after the direct cost of delivering it, before overhead..
Electrical Recurring Revenue
What a book of electrical agreements is worth, including the repair work members bring back..
Beyond the numbers
Tools that produce something you can send
Invoice Generator
Build a clean, itemised invoice and print it to PDF.
Open toolEstimate Generator
Turn a scope of work into a priced estimate the customer can approve.
Open toolWork Order Generator
Write the job down before the technician leaves: what, where, who, and what they need to take with them..
Open toolOther categories
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