The small questions that come up away from work — in the kitchen, on a trip, at a table splitting a bill, or halfway through tuning a guitar. All free, all instant, and none of them ask for anything.
Featured
- Fuel Cost Calculatorfuel cost for a journey from distance, economy and price.
- Gas Mileage Calculatoractual fuel economy from distance travelled and fuel used.
- Trip Cost Calculatortotal trip cost across fuel, accommodation, food and activities, split per person.
- Bill Split Calculatorsplits a bill evenly or by what each person ordered, with tip included.
- Recipe Cost Calculatorcost per serving from ingredient prices and pack sizes.
- Tip Calculatortip and total across a group, with rounding options.
- Sleep Cycle Calculatorbedtimes and wake times aligned to complete sleep cycles.
- EV Charging Cost Calculatorcost per charge and per mile from battery size, electricity rate and efficiency.
Travel & mobility
- Bra Size Calculatorband and cup size from measurements, with the sister-size equivalents.
- Theme Park Fast Pass Calculatorwhether a skip-the-line pass is worth its price, from wait times and park hours.
- Jet Charter Cost Calculatorprivate charter cost by aircraft class, distance and repositioning.
Cooking & home
- Air Fryer Converteradjusts conventional oven time and temperature for an air fryer.
- Coffee Ratio Calculatorcoffee and water by brewing method, from espresso through French press.
- Cooking Conversion Calculatorcups, grams, millilitres and spoons — by ingredient, because volume-to-weight differs for each.
- Child Height Predictorprojected adult height for a child, from parental heights.
- Subscription Cost Calculatorthe annual total of monthly subscriptions, which is usually more than expected.
Pets
- Pet Age Calculatorpet age in human years, using the curves that are actually accurate rather than multiplying by seven.
- Pet Calorie Calculatordaily calories for a dog or cat by weight, age and activity.
Sports & recreation
- Darts Checkout Calculatorthe checkout route from any score, ordered by how commonly it is played.
- Golf Handicap Calculatorhandicap index from recent scores, course rating and slope.
- Love Calculatorentirely for entertainment, and it says so.
- Steps to Miles Calculatordistance walked from step count, using your height and stride length.
Music, photography & maker tools
- BPM Calculatortempo by tapping, plus note durations and delay times at that BPM.
- Depth of Field Calculatornear and far focus limits from aperture, focal length and distance, by sensor size.
- Fret Calculatorfret positions along a fingerboard from scale length, for building or intonation.
- Guitar String Tension Calculatortension per string from gauge, scale length and tuning — useful before dropping tuning.
EV & environment
- Carbon Footprint Calculatorannual emissions from travel, home energy and diet, with the largest contributor identified.
- EV vs Gas Savings Calculatorrunning cost of an electric vehicle against petrol over the same distance.
Related tools
Useful cross-category tools connected to this topic.
- 3D Printing Cost Calculatormaterial, electricity and machine time cost for a print job.
- Dice Rollerany number of dice with any number of sides, in tabletop notation.
- Solar Panel Payback Calculatoryears to recoup a solar installation's cost from the electricity it saves.
The one that surprises people
Run your subscriptions through the Subscription Cost Calculator once. Most people are carrying somewhere between eight and fifteen recurring charges and can name perhaps six of them from memory.
The reason is structural rather than careless: each charge is individually too small to trigger a decision, and they arrive on different dates, so they never appear together as a single number. Seeing the annual total in one figure is usually the first time the actual amount registers — and the ones you had forgotten are, by definition, the ones you are not using.
Frequently asked questions
How many grams is a cup of flour?
About 120 g, but it depends on how the cup was filled — scooped flour packs denser than spooned flour, and the difference can reach 20%. This is why baking recipes that matter are written by weight. The Cooking Conversion Calculator asks which ingredient before converting, since sugar, butter and water are all substantially different.
What temperature and time for an air fryer?
The usual adjustment is about 20°C lower and 20% less time than a conventional oven, because circulating air transfers heat much faster. Check earlier than you think you need to the first time you make something — air fryers vary considerably by model and basket size, and going from underdone to overdone takes very little.
How should we split a bill when people ordered differently?
The Bill Split Calculator handles both — evenly, or itemised per person with tax and tip distributed proportionally. Proportional is the fairer method when orders differ substantially, since the person who had a starter and dessert also generated more tax and more tip, not just more food cost.
Is the pet age calculator accurate?
More accurate than the seven-year rule, which is badly wrong at both ends. A one-year-old dog is roughly equivalent to a fifteen-year-old human, and ageing then slows and varies substantially by breed size — small dogs live considerably longer than large ones. The calculator uses size-adjusted curves rather than a flat multiplier.
Why does string tension matter on a guitar?
Because it changes both feel and setup. Dropping to a lower tuning with standard gauge strings reduces tension noticeably, which brings buzzing and floppy response; heavier gauges compensate. Changing total tension across the set also shifts neck relief, so a truss rod adjustment usually follows. The calculator shows per-string and total tension so you can match a new set to the old one.
Is the love calculator based on anything?
No, and the page says so plainly. It is a deterministic function of two names, included for fun. Every calculator on this site states its method, and for this one the honest method is that there isn't one.
Other categories
- Health CalculatorsBMI, calories, fitness and sleep
- Unit Converterscooking, length, weight and temperature
- Date & Time Calculatorscountdowns, durations and time zones
- Financial Calculatorsbudgeting, savings and everyday money