Tools you might need next
Calculate grass seed pounds needed by area and seed type coverage rate. Free online landscape design calculator with instant, accurate results.
Calculate mulch cubic yards from bed area and desired depth. Free online landscape design calculator with instant, accurate results.
Estimate retaining wall block count for length and height. Free online landscape design calculator with instant, accurate results.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
Watts = Lumens ÷ Efficacy (lm/W); LED ~80–120 lm/WThe calculation requires: Lumens per Fixture, Fixture Efficacy, Number of Fixtures. Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
Ensure denominator values (divisors) are non-zero. The calculator validates this, but understanding which fields cannot be zero helps interpret results correctly.
Calculate outdoor lighting wattage from desired lumens and fixture efficacy. Free online landscape design calculator with instant, accurate results. It applies the calculation formula (Watts = Lumens ÷ Efficacy (lm/W); LED ~80–120 lm/W). For example: 1500 lm per fixture, 100 lm/w, 6 fixtures — A typical use case demonstrating the calculator with representative values.