Summer calculators
Shown Jun–Jul
Latest update:
Summer tools
Heat Index CalculatorCalculate the NWS heat index — the feels like temperature — from air temperature and relative humidity or dew point, including the official branch decision and humidity adjustments.UV Exposure Level CalculatorEstimate relative UV exposure from the UV index, minutes outdoors, and Fitzpatrick skin type, with a low to very high exposure level and EPA-style protection guidance.Humidex CalculatorCalculate the humidex from air temperature and dew point with the Environment Canada formula, and read the comfort category from little discomfort to dangerous.Solar Panel Angle CalculatorDisplay fixed or seasonal photovoltaic panel tilt angles for a scenario without claiming a latitude-derived optimal.Water Demand CalculatorEstimate daily and annual household water use from people, fixture events, other measured use, and your water-bill rate.Dew Point CalculatorPerform a dew point calculation from air temperature and relative humidity, with condensation, comfort, weather, and building-moisture guidance.Solar Panel Energy Scenario CalculatorCalculate user-sourced low and high annual solar-energy scenarios from usable panel area, panel geometry, nameplate rating, and documented specific-yield inputs.Daylight Hours CalculatorCalculate approximate daylight duration, local solar sunrise, sunset, and solar noon from latitude and date, including polar day and polar night cases.Swimming Speed CalculatorCalculate average swimming speed, pace per 100 meters, equivalent pool lengths, and constant-pace projected times.Plant Watering Schedule CalculatorCreate a repeatable houseplant watering cadence with days between waterings, weekly counts, and monthly counts from plant need and room conditions.Rainwater Harvesting CalculatorEstimate monthly and annual rainwater harvest from roof area and monthly rainfall in metric or imperial units, with a realistic collection efficiency and first-flush caveats.BBQ Party CalculatorEstimate BBQ party quantities for adults and children, including meats, sides, supplies, appetite adjustments, meat mix percentages, and cost assumptions.
Frequently asked questions
- Heat index, humidex, and dew point — which is which?
- The Heat Index Calculator computes the NWS heat index — the feels-like temperature — from air temperature and relative humidity or dew point, including the official branch decision and humidity adjustments. The Humidex Calculator uses the Environment Canada formula with air temperature and dew point, and reads the comfort category from little discomfort to dangerous. The Dew Point Calculator performs a dew point calculation from air temperature and relative humidity, with condensation, comfort, weather, and building-moisture guidance.
- How do I stay safe in the sun?
- The UV Exposure Level Calculator estimates relative UV exposure from the UV index, minutes outdoors, and Fitzpatrick skin type, with a low to very high exposure level and EPA-style protection guidance.
- Which tools cover water use and watering?
- The Water Demand Calculator estimates daily and annual household water use from people, fixture events, other measured use, and your water-bill rate. The Rainwater Harvesting Calculator estimates monthly and annual rainwater harvest from roof area and monthly rainfall in metric or imperial units, with a realistic collection efficiency and first-flush caveats. The Plant Watering Schedule Calculator creates a repeatable houseplant watering cadence with days between waterings, weekly counts, and monthly counts from plant need and room conditions.
- What do the solar and daylight tools do?
- The Solar Panel Angle Calculator displays fixed or seasonal photovoltaic panel tilt angles for a scenario without claiming a latitude-derived optimal. The Solar Panel Energy Scenario Calculator calculates user-sourced low and high annual solar-energy scenarios from usable panel area, panel geometry, nameplate rating, and documented specific-yield inputs. The Daylight Hours Calculator computes approximate daylight duration, local solar sunrise, sunset, and solar noon from latitude and date, including polar day and polar night cases.