Prepaid Electricity Calculator
Convert rands to kWh or kWh to rands using Eskom's 2024/25 Inclining Block Tariff. Includes load shedding generator cost and appliance budget tools.
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Electricity Units
192,6 kWh
Amount Spent
R 500
Average Rate
259,6c/kWh
Days at 20 kWh/day
10 days
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How Eskom's Block Tariff Works
South Africa uses an Inclining Block Tariff (IBT) — the more you use, the more each unit costs. Low-consumption households in Block 1 pay the least. This incentivises energy saving and subsidises low-income households who use less electricity.
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kWh
Total Monthly Cost
R 521
Eskom IBT Block Rate Breakdown
| Block | Units | Rate | Cost |
|---|---|---|---|
| Block 1 (0–50 kWh) | 50 kWh | 174,81c/kWh | R 87 |
| Block 2 (51–350 kWh) | 150 kWh | 289,36c/kWh | R 434 |
Usage vs Cost Curve
Eskom Homelight IBT Rates (2024/25)
| Block | Usage Range | Rate (c/kWh) |
|---|---|---|
| Block 1 | 0–50 kWh | 174.81 |
| Block 2 | 51–350 kWh | 289.36 |
| Block 3 | 351–600 kWh | 356.88 |
| Block 4 | >600 kWh | 421.51 |
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Full Electricity Cost Analysis
kWh
%
Monthly Electricity Cost
R 955
Annual
R 11 466
Avg rate
273c/kWh
Cost Projection (12% annual increase)
| Year | Annual Cost | vs Today |
|---|---|---|
| Today | R 11 466 | — |
| +1 year | R 12 842 | +R 1 376 |
| +2 years | R 14 383 | +R 2 917 |
| +3 years | R 16 109 | +R 4 643 |
| +5 years | R 20 207 | +R 8 741 |
Municipal Rate Comparison
| Municipality | Monthly (350 kWh) |
|---|---|
| Eskom Direct | R 955 |
| City of Johannesburg | R 1 070 |
| City of Cape Town | R 1 032 |
| eThekwini (Durban) | R 1 051 |
| Tshwane (Pretoria) | R 1 041 |
| Nelson Mandela Bay | R 1 013 |
Eskom IBT Tariff Note: Inclining Block Tariff (IBT) was introduced to discourage excess use. Low-consumption households pay less per kWh. Rates shown are 2024/25 Eskom Homelight tariffs. Municipal buy-and-sell rates may differ significantly.
Frequently Asked Questions
Using 2024/25 Eskom IBT rates, R500 purchases approximately 185–210 kWh. The first 50 kWh costs ~R87, the next 300 kWh costs ~R868. At 20 kWh/day average usage, R500 lasts about 10 days.
Annual Eskom tariff increases (typically 12–18% in recent years) mean the same rand amount buys fewer units each year. Geysers, stoves, and heaters are the biggest consumers — a 3kW geyser running 2 hours a day uses 6 kWh daily (R180–R260/month alone).