Clarity for everyday choices
Fast, practical calculators for everyday decisions. No fluff—just the math.
Latest energy calculators
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ClearStag is built around simple inputs and clear outputs. Most tools follow straightforward formulas (like power × time × price) to give practical estimates you can use for planning and comparison.
As the site grows, calculators are organised into hubs—Energy, Money, Health, and Home—so you can find the right tool quickly.
Latest calculators & guides
Packing list basics for 3–7 days
travelFlight carbon footprint: what affects it?
travelTime zone difference: avoiding scheduling mistakes
travelTravel budget per day: a simple framework
travelRoad trip fuel cost: what changes it most?
travelHeater size: watts per m² explained
homeMoving boxes: how many do I need?
homeHow to measure room size in m²
homeTiles per square meter: quick rule of thumb
homeHow much paint do I need for one room?
homeResting heart rate: what is normal?
healthSleep cycles and ideal bedtimes
health