Pellet calculator: how many pellets for a heating season
A 150 m² house insulated after 2000, with hot water for four people, burns about 4.5 t of pellets per season, about 298 bags of 15 kg. At 2,330 PLN/t that is about 10,405 PLN. Enter your floor area, price and boiler efficiency to see your own result.
Example: 150 m² house, insulated
For the season you need about 4.5 t of pellets
- 298 bags of 15 kg
- 5 pallets of 975 kg
- 6.0-7.4 m³ of space if loose
Cost about 10,405 PLN a season
about 1,367 PLN in a heating season monthabout 867 PLN a month on averageheat demand about 18,600 kWh/yr
Prices from 11 October 2026, estimate
| Fuel | Per season | 1 kWh of heat | Season cost |
|---|---|---|---|
| Pellets | 4.5 t | 0.56 PLN/kWh | 10,405 PLN |
| Eco-pea coal | 3.1 t | 0.27 PLN/kWh | 4,960 PLN |
| Firewood | 12.3 mp | 0.33 PLN/kWh | 6,167 PLN |
| Natural gas | 1,784 m³ | 0.33 PLN/kWh | 6,069 PLN |
| LPG | 2,937 l | 0.51 PLN/kWh | 9,398 PLN |
Assumptions and formulaPrices from 11 October 2026
Heat demand
Q = 150 m² × 100 kWh/m² + 4 people × 900 kWh = 18,600 kWh
Amount of fuel
m = 18,600 kWh ÷ (4.9 kWh/kg × 0.85) = 4,466 kg
Season cost
4.466 t × 2,330 PLN/t = 10,405 PLN
Heating season month
8,391 PLN ÷ 7 + 2,014 PLN ÷ 12 = 1,367 PLN
- Hot water per person
- 900 kWh
- Calorific value
- 4.9 kWh/kg
- Bag
- 15 kgMurator: 15 kg bags on pallets of about 975-1,000 kg, Oct 2026
- Pallet
- 975 kgMurator: 15 kg bags on pallets of about 975-1,000 kg, Oct 2026
- Bulk density of A1 pellets
- 600-750 kg/m³DIN CERTCO, A1 pellet requirements under EN ISO 17225-2: 600-750 kg/m³
- Appliance efficiency
- 85 %
- Price
- 2,330 PLN/tMedian price of bagged pellets from producers and depots, Murator, Oct 2026
- Heating season length
- 7 moexample, hot water counted over 12 months
An estimate for a typical heating season. Delivery, fixed gas charges and the appliance with its servicing are not included.
How electricity, gas, pellet and coal prices have changed, month by month. Price history
Ready-made calculations
How to use the calculator
- Enter the floor area, insulation standard and household size, or type the heat demand in kWh.
- Check the pellet price per tonne, boiler efficiency and bag weight from the offer.
- Click Calculate usage and read the tonnes, bags, pallets and storage space.
Pellets per season for a 100-200 m² house
For houses insulated after 2000, with hot water for four people, the calculator gives: 100 m² about 3.3 t (about 7,608 PLN), 120 m² about 3.7 t (about 8,727 PLN), 150 m² about 4.5 t (about 10,405 PLN), 200 m² about 5.7 t (about 13,202 PLN). Without hot water a 150 m² house burns about 3.6 t for about 8,391 PLN.
Every 1,000 kWh of heat takes about 240 kg of pellets, because one kilogram gives about 4.165 kWh in an 85% boiler. 1 kWh of heat from pellets at 2,330 PLN/t costs about 0.56 PLN.
Bags, pallets and storage space
The 4.5 t supply for a 150 m² house is about 298 bags of 15 kg, or 5 pallets of 975 kg. A1 pellets have a bulk density of 600-750 kg/m³, so the same amount loose takes about 6.0-7.4 m³.
In a heating season month (e.g. 7 months) you spend about 1,367 PLN on pellets, and about 867 PLN a month averaged over the year. Keep the store dry: damp pellets fall apart into sawdust that blocks the auger.
Frequently asked questions
How many bags of pellets do I need for winter?
A 150 m² house insulated after 2000 with hot water for four people needs about 4.5 t, about 298 bags of 15 kg. A 120 m² house of the same standard burns about 3.7 t.
How much space does a tonne of pellets take?
A tonne of loose A1 pellets takes about 1.3-1.7 m³, because the bulk density is 600-750 kg/m³. In bags it is one pallet of about 975 kg on about 1.2 × 0.8 m of floor.
How much do pellets for a whole season cost?
At 2,330 PLN/t a 150 m² house with hot water for four people spends about 10,405 PLN, and a 100 m² house about 7,608 PLN. Enter the price from your offer and the calculator updates the cost.