Editor’s picks
Twelve calculators the editor picked, two from each collection.
How this list is chosen
Chosen by the editor, not by traffic. This site carries no analytics script, so there is no honest way to rank by popularity yet.
Business & TradeStorage Cost CalculatorEstimates what it costs to keep data or goods in storage for a month or a year, and shows how the bill scales with volume and duration.OpenTravelFlight Cost ComparatorPuts two flight options side by side with bags, transfers and ground travel included, so the cheaper ticket is not a surprise.OpenBusiness & TradeCost Reduction Target CalculatorTurns a savings goal into the weekly or monthly cut you actually need, and shows what happens if you miss a checkpoint.OpenReal EstateStorage Unit Size CalculatorWorks out which unit size fits your inventory from the items you list, so you do not pay for space you never use.OpenScience & EngineeringBattery Bank Capacity CalculatorSizes a battery bank from your daily load and the days of autonomy you want, with depth of discharge and inverter losses counted.OpenLifestyleAge in Days CalculatorConverts any birth date into days, weeks and months lived, which is handy for anniversaries, contracts and pet records.OpenAutomotiveBattery Charging Time CalculatorTells you how long a charge takes from charger output, battery size and efficiency, from phones up to e-bike packs.OpenTravelFlight Time CalculatorEstimates airborne time between two airports from great-circle distance and a typical cruise speed, before you add layovers.OpenBusiness & TradeAspect Ratio CalculatorFinds the missing width or height for any ratio, so images and video fit a frame without stretching.OpenScience & EngineeringSolar Payback Period CalculatorWorks out when a rooftop array has paid for itself, using system cost, local output and your electricity rate.OpenEnvironmentWater Recycling Savings CalculatorCompares the water a recycling setup saves against what it costs to run, and shows the break-even month.OpenLifestyleWalking Distance CalculatorMeasures how far a route is on foot and how long it takes at an easy pace, so you can decide between walking and riding.Open
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