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Solar Feed In estimates income from electricity exported by a solar installation. Its direction is different from a household electricity-cost calculator: exported kilowatt-hours are multiplied by an export tariff to estimate money received. A panel may generate electricity, a home may use some of it, and only the measured or estimated surplus sent to the grid belongs in this calculation. Entering total generation would overstate export income whenever the home consumes solar power during the day.
Most new UK installations are considered under the Smart Export Guarantee, or SEG. A licensed electricity supplier sets the SEG tariff and pays eligible generators for exported electricity, subject to its terms and metering requirements. The old Feed-in Tariff, or FIT, scheme closed to new applicants in 2019, although existing accredited installations can continue under their historic arrangements. A calculator should not silently mix an old FIT generation payment, an export payment, and savings from avoided imports; they are different revenue or benefit streams.
Export is commonly measured by a smart meter or export-capable meter, but some tariffs allow an estimate based on deemed export or a supplier-specific method. Meter configuration, registration, commissioning date, export limits, battery charging, and whether the installer has completed the required paperwork all affect what a supplier will pay. The output here is therefore a scenario estimate from the kWh and tariff you enter.
For an investment decision, keep three lines separate: the value of solar used in the home, the payment for exported electricity, and the capital or finance cost of the installation. A battery can move energy between those lines by changing the time of export. Seasonal generation also means that a single monthly reading should not be extrapolated casually. Use export statements where available, label estimates clearly, and compare supplier terms on payment timing and meter eligibility as well as pence per kWh.
Export-metering and estimation are not interchangeable evidence. A meter reading records what crossed the export boundary; a deemed figure applies a defined assumption when the available meter data is not suitable. Ask the supplier which method the tariff uses, whether an export limit is enforced, and when readings are taken. Keep generation, import, battery charge, and export registers distinct so an annual income forecast can be reconciled to a statement.
When a tariff changes, preserve the old rate and the dates it applied instead of applying today's rate to the whole year. A supplier statement is the best reconciliation point: its export units, rate, payment period, and eligibility notes reveal whether the scenario used the same boundary. This makes the estimate useful for planning without confusing a forecast with a contractual payment.
For a related household planning question, compare Council Tax Calculator, TV Licence Calculator, and Electricity Cost Calculator. These pages use different measurements and assumptions, so keep the time period, tariff, local rule, and evidence source visible rather than combining their outputs automatically.
Export income = exported electricity (kWh) × export tariff (£/kWh)
For example, 2,000 exported kWh at 15p/kWh (£0.15/kWh) gives an estimated £300. This excludes avoided import costs, standing charges, battery degradation, tax treatment, and any separate generation payment.
Increasing exported kWh increases the estimated payment linearly. A higher tariff also increases income, but supplier tariffs can be fixed, variable, time-dependent, or conditional on taking another service. Read the tariff's eligibility, export limit, payment timing, and meter rules rather than comparing headline pence figures alone.
If you have a battery, the export profile may change without changing annual generation. More self-consumption can reduce purchases from the grid but can also reduce export income. The best household decision compares import savings and export revenue together with battery costs.
This is an illustrative export-income estimate, not a tariff offer or guarantee of eligibility. SEG and legacy FIT terms, metering requirements, export limits, and supplier rates vary. Confirm current arrangements with your energy supplier and Ofgem guidance.