Energy and Power Calculators 2026 - Fuel, Electricity, Solar
What makes the energy - power category useful
This category groups calculators that solve closely related real-world tasks, so you can move from a quick estimate to a more specific planning tool without restarting the process.
Project monthly electricity bills from kWh usage, tariff rates, and supply charges
Estimate solar savings, payback years, and self-consumption from system size
Compare petrol vs diesel running costs over distance and fuel price scenarios
Calculate generator and battery backup runtime from load in watts and capacity in Wh
Add fuel surcharges, route detours, and courier costs to logistics quotes
Household energy planning
Estimate electricity bills, solar payback, and battery sizing for home use.
Fleet and logistics costs
Track fuel expenses, route detours, and surcharges across petrol and diesel fleets.
Backup power and outages
Size generators and battery backups for required runtime under typical home loads.
All Energy - Power Calculators
Fuel Cost Increase Calculator
Extra cost after fuel price hike.
Petrol vs Diesel Cost Calculator
Petrol vs diesel comparison.
Delivery Cost Increase Calculator
Fuel surcharge per delivery.
Fleet Fuel Expense Calculator
Multi-vehicle fuel budget.
Generator Running Cost Calculator
Generator fuel cost estimator.
Electricity Bill Calculator
Monthly electricity cost.
Solar Savings Calculator
Solar panel payback & savings.
Battery Backup Calculator
UPS/battery runtime estimate.
Inverter Load Calculator
Inverter capacity checker.
LPG Gas Cost Calculator
Monthly cooking gas expense.
Route Detour Fuel Cost Calculator
Detour vs direct fuel cost.
Courier Fuel Surcharge Calculator
Fuel surcharge % for couriers.
Air Freight Cost Calculator
Air cargo cost estimate.
Sea Freight Cost Calculator
Ocean freight cost estimate.
War-Risk Premium Calculator
Conflict-zone maritime insurance surcharge.
Fleet Operating Cost Calculator
Total fleet operating cost breakdown.
Last-Mile Delivery Cost Calculator
True cost per last-mile delivery drop.
Fuel Surcharge Pass-Through Calculator
Fuel cost pass-through pricing tool.
Diesel Consumption Calculator
Diesel usage and cost estimator.
Fuel Cost per Trip Calculator
Calculate total fuel cost for a trip.
Electricity vs Generator Cost Calculator
Grid vs Generator cost comparison.
Generator Fuel Consumption Calculator
Estimate generator fuel usage in litres per hour at any load level.
Inverter Battery Runtime Calculator
Battery backup time estimator.
Diesel vs Petrol Generator Cost Calculator
Compare diesel and petrol generator costs.
Monthly Energy Cost Increase Calculator
Calculate bill increase impact.
Appliance Running Cost Calculator
Cost of running a specific appliance.
Backup Power Cost Calculator
Cost of power outages.
kVA to kW Conversion Calculator
Convert apparent power (kVA) to real power (kW) using power factor.
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How do I calculate my monthly electricity bill?
Multiply monthly kWh used by the per-kWh tariff, then add the daily supply charge times days in the month. 600 kWh at $0.30 per kWh plus $1.10 daily supply over 30 days equals $213 for the month.
How long does a solar system take to pay back?
Most residential solar systems pay back in 4 to 8 years depending on system size, sunlight, electricity tariff, and self-consumption rate. A 6.6 kW system in a sunny region commonly pays back in about 5 years.
How much does it cost to run a generator?
Multiply fuel consumption per hour by fuel price by hours run. A diesel generator using 2.5 litres per hour at $2.10 per litre costs $5.25 per hour, or $126 for a full 24 hour outage.
How do I size a battery backup for my home?
Sum the wattage of essentials (fridge 150 W, lights 60 W, modem 20 W) and multiply by hours of backup needed. 230 W for 12 hours equals 2,760 Wh, so a 3 kWh battery is the minimum sensible size.
Is petrol or diesel cheaper per kilometre?
Diesel vehicles typically use 20 to 30 percent less fuel per km than petrol, but diesel is often more expensive per litre. At the same fuel price, diesel usually wins per km. The petrol vs diesel calculator factors both into a real cost.
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