Energy calculators

50 live energy calculators inside Environmental & Sustainability on The Online Calculator 24. Every engine shows its formula, the worked steps behind the default figures, and the standard or dataset the method comes from.

Live Energy tools

• Solar Panel Energy Output & Generation Calculator — Calculate daily, monthly, and annual solar PV electricity generation (kWh & MWh) factoring in local peak sun hours, system derate efficiency, and 25-year panel degradation.
• Solar ROI Calculator — Calculate return on investment, net present value and internal rate of return for a rooftop solar system over its full life, including incentives, degradation and tariff escalation.
• Solar PV & Battery Payback, ROI & LCOE Calculator — Calculate residential/commercial solar and battery payback periods, 25-year cumulative electricity savings, Levelized Cost of Electricity (LCOE), and carbon offset.
• Solar Net Metering Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for solar net metering, the arithmetic utility bills hide.
• Solar Battery Storage Capacity & Critical Backup Autonomy Calculator — Size whole-home and critical-load energy storage battery banks (kWh), calculate continuous runtime during grid outages, and model 30% Federal ITC storage incentives.
• Solar String Calculator Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for solar string calculator, the arithmetic utility bills hide.
• Inverter Sizing Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for inverter sizing, the arithmetic utility bills hide.
• Tilt Angle Optimization Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for tilt angle optimization, the arithmetic utility bills hide.
• Azimuth Optimization Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for azimuth optimization, the arithmetic utility bills hide.
• Shading Loss Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for shading loss, the arithmetic utility bills hide.
• Temperature Coefficient Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for temperature coefficient, the arithmetic utility bills hide.
• Soiling Loss Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for soiling loss, the arithmetic utility bills hide.
• Grid Parity Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for grid parity, the arithmetic utility bills hide.
• LCOE (Solar) Calculator — Compute the levelised cost of energy for a solar project — the discounted lifetime cost per kWh — and compare it against grid tariffs and other generation sources.
• LCOE (Wind) Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for lcoe (wind), the arithmetic utility bills hide.
• LCOE (Nuclear) Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for lcoe (nuclear), the arithmetic utility bills hide.
• LCOE (Gas) Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for lcoe (gas), the arithmetic utility bills hide.
• LCOE (Coal) Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for lcoe (coal), the arithmetic utility bills hide.
• LCOE (Hydro) Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for lcoe (hydro), the arithmetic utility bills hide.
• Wind Turbine Output Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for wind turbine output, the arithmetic utility bills hide.
• Wind Farm Layout Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for wind farm layout, the arithmetic utility bills hide.
• Wind Speed to Power Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for wind speed to power, the arithmetic utility bills hide.
• Capacity Factor Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for capacity factor, the arithmetic utility bills hide.
• Load Factor Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for load factor, the arithmetic utility bills hide.
• Power Purchase Agreement Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for power purchase agreement, the arithmetic utility bills hide.
• Energy Storage ROI Calculator — The headline efficiency ratio for energy storage roi: what the spend earned in total, as a multiple, and normalised per year so it can fight other options on one page.
• Battery Cycle Life Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for battery cycle life, the arithmetic utility bills hide.
• Depth of Discharge Calculator — The full price tag for depth of discharge: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Battery Degradation Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for battery degradation, the arithmetic utility bills hide.
• Vehicle-to-Grid Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for vehicle-to-grid value, the arithmetic utility bills hide.
• Demand Response Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for demand response value, the arithmetic utility bills hide.
• Time-of-Use Optimization Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for time-of-use optimization, the arithmetic utility bills hide.
• Peak Shaving Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for peak shaving value, the arithmetic utility bills hide.
• Load Shifting Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for load shifting value, the arithmetic utility bills hide.
• Energy Arbitrage Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for energy arbitrage, the arithmetic utility bills hide.
• Frequency Regulation Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for frequency regulation, the arithmetic utility bills hide.
• Ancillary Services Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for ancillary services value, the arithmetic utility bills hide.
• Green Hydrogen Cost Calculator — The full price tag for green hydrogen cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Electrolyzer Efficiency Calculator — Attainment of electrolyzer efficiency against a target, with the absolute gap and the weighted contribution for scorecard roll-ups.
• Fuel Cell Efficiency Calculator — Attainment of fuel cell efficiency against a target, with the absolute gap and the weighted contribution for scorecard roll-ups.
• Heat Pump COP Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for heat pump cop, the arithmetic utility bills hide.
• Heat Pump COP vs. Natural Gas Operating Cost & Carbon Calculator — Compare the operating costs and carbon emissions of an electric air-source heat pump against a natural gas furnace, calculating annual savings and exact breakeven COP.
• Geothermal Cost Calculator — The full price tag for geothermal cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Tidal Energy Cost Calculator — The full price tag for tidal energy cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Wave Energy Cost Calculator — The full price tag for wave energy cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Micro-Hydro Cost Calculator — The full price tag for micro-hydro cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Biomass Energy Cost Calculator — The full price tag for biomass energy cost: variable spend, one-off costs and an explicit contingency band, with the all-in per-unit figure quotes obscure.
• Biogas Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for biogas value, the arithmetic utility bills hide.
• Anaerobic Digestion Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for anaerobic digestion value, the arithmetic utility bills hide.
• Waste-to-Energy Value Calculator — What a load actually costs to run over a year — watts-hours-to-dollars conversion for waste-to-energy value, the arithmetic utility bills hide.

Reading a Energy result

A number on its own is the weakest thing a calculator can give you, so these tools pair each output with the comparison that gives it meaning: the gap to a target, the band the value falls in, or what a realistic swing in one input does to the answer. When a figure looks wrong, that is usually the fastest place to check — re-run it with one input moved and see whether the change lines up with the formula printed above the result.

Related sub-topics in Environmental & Sustainability

• Carbon & Climate — 49 live tools.
• Waste & Circular Economy — 49 live tools.