Enter Value: From Unit: Watt per Square Meter (W/m²) Kilowatt per Square Meter (kW/m²) BTU per Hour per Square Foot (BTU/hr·ft²) Calorie per Second per Square Millimeter (cal/sec·mm²) Calorie per Second per Square Centimeter (cal/sec·cm²) To unit: Watt per Square Meter (W/m²) Kilowatt per Square Meter (kW/m²) BTU per Hour per Square Foot (BTU/hr·ft²) Calorie per Second per Square Millimeter (cal/sec·mm²) Calorie per Second per Square Centimeter (cal/sec·cm²) Convert