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Calculate illuminance (foot-candles) at a surface from ...
Convert between lumens, watts, and luminous efficacy. Use ...
Calculate total lumens needed and number of light fixtures ...
Estimate water heater tank size or first-hour rating ...
Calculate U-value (thermal transmittance) from R-value and ...
Calculate BTU output needed from a radiator for a given ...
Calculate total R-value of a wall or ceiling assembly. Use ...
Estimate humidifier output (gallons/day) needed for a home. ...
Estimate heat loss through walls, ceiling, and windows. Use ...
Estimate dehumidifier capacity (pints/day) needed for a ...
Determine the recommended ceiling fan blade span for a ...
XTRAW Tools
Free calculators, converters, generators, and simple apps for everyday decisions.
XTRAW Tools
Free calculators, converters, generators, and simple apps for everyday decisions.