It’s useful to convert BTU ↔ Watts to compare specs and size correctly. Keep comparisons at the same Delta T; Trade Radiators lists outputs at ΔT50. Use the calculator for room sizing, then convert units if needed.
Watts = BTU × 0.29307107
BTU = Watts × 3.412141633
Tip: for quick estimates use 0.293 and 3.412. Round sensibly; choose the next size up if you’re between outputs.
BTU↔W is a pure unit change and does not depend on ΔT. Compare radiators at the same ΔT50.
Compare like‑for‑like at ΔT50. Rule of thumb: ΔT60 → ΔT50 ×0.79; ΔT50 → ΔT60 ×1.26. Learn more in the Delta T guide.
| BTU | Watts |
|---|---|
| 1,000 | 293 |
| 1,500 | 440 |
| 2,000 | 586 |
| 2,500 | 733 |
| 3,000 | 879 |
| 3,500 | 1,026 |
| 4,000 | 1,172 |
| 4,500 | 1,319 |
| 5,000 | 1,465 |
| 5,500 | 1,612 |
| 6,000 | 1,758 |
| 6,500 | 1,905 |
| 7,000 | 2,051 |
| 7,500 | 2,198 |
| 8,000 | 2,345 |
| 8,500 | 2,491 |
| 9,000 | 2,638 |
| 9,500 | 2,784 |
| 10,000 | 2,931 |
| 10,500 | 3,077 |
| 11,000 | 3,224 |
| 11,500 | 3,370 |
| 12,000 | 3,517 |
| 12,500 | 3,663 |
| 13,000 | 3,810 |
| 13,500 | 3,956 |
| 14,000 | 4,103 |
| 14,500 | 4,250 |
| 15,000 | 4,396 |
| 15,500 | 4,543 |
| 16,000 | 4,689 |
| 16,500 | 4,836 |
| 17,000 | 4,982 |
| 17,500 | 5,129 |
| 18,000 | 5,275 |
| 18,500 | 5,422 |
| 19,000 | 5,568 |
| 19,500 | 5,715 |
| 20,000 | 5,861 |
Rounded using 1 BTU = 0.29307107 W.
Tip: Our Heating Calculator estimates your room’s output at ΔT50 and links straight to suitable products. If you only have BTU or Watts, use the table above, then shop by output.
| Watts | BTU |
|---|---|
| 100 | 341 |
| 200 | 682 |
| 300 | 1,024 |
| 400 | 1,365 |
| 500 | 1,706 |
| 600 | 2,047 |
| 700 | 2,388 |
| 800 | 2,730 |
| 900 | 3,071 |
| 1,000 | 3,412 |
| 1,100 | 3,753 |
| 1,200 | 4,095 |
| 1,300 | 4,436 |
| 1,400 | 4,777 |
| 1,500 | 5,118 |
| 1,600 | 5,459 |
| 1,700 | 5,801 |
| 1,800 | 6,142 |
| 1,900 | 6,483 |
| 2,000 | 6,824 |
| 2,100 | 7,165 |
| 2,200 | 7,507 |
| 2,300 | 7,848 |
| 2,400 | 8,189 |
| 2,500 | 8,530 |
| 2,600 | 8,872 |
| 2,700 | 9,213 |
| 2,800 | 9,554 |
| 2,900 | 9,895 |
| 3,000 | 10,236 |
Rounded using 1 W = 3.412141633 BTU.
Contact Us
Phone: 0141 225 0430 (9am-5pm Mon-Fri)
My Account
Sign-in to your account >
Heating Calculator
Calculate your BTU for each room
Price Match Promise
Free Delivery* | Easy Returns
Up to 25 Year Extended Guarantees
