Conversions Please select from the handy engineering conversions tools below, bookmark this page now for quick access! Lengths- convert meters, millimetres, feet, inches, miles etc. Areas- convert meters squares, millimetres squared, feet squared etc. Volumes- convert meters cubed, litres, feet squared, gallons etc. Weights- convert kilograms, grams, pounds, tonnes etc. Power- convert- kilowatts, megawatts, BTU per hour etc. Flow Rates- convert litres per second, meters cubed per minute, meters cubed per hour etc. Please visit our sponsor SJW Designs