All Calculators
A crawlable directory of every calculator and quick utility on the site, grouped by the kind of question it answers.
Time and date
Time Since CalculatorCount days, weeks and years since a date.
Days Until CalculatorCount calendar days to a future date.
Date Difference CalculatorCompare two dates.
Age CalculatorCalculate completed years and total days.
90 Days From TodayFind a future date by day count.
Unix Timestamp ConverterConvert Unix seconds to local time.
Birthday CountdownCount days until a birthday.
Sleep Cycle CalculatorEstimate a bedtime from wake time.
Day of the WeekFind the weekday for any date.
Half BirthdayFind the six-month birthday date.
Movie MarathonAdd runtimes and breaks.
Weekday CountdownCount weekdays before a target date.
Conversions and comparisons
Kg to LbsWeight conversion.
Cm to InchesLength conversion.
Celsius to FahrenheitTemperature conversion.
Miles to KmDistance conversion.
Liters to GallonsVolume conversion.
Cooking ConversionsRecipe volume conversion.
Planet WeightGravity comparison.
Recipe ScalerServing ratio calculation.
Pizza ValueArea and cost comparison.
Running PacePace and speed.
Road Trip FuelFuel use and cost.
Screen SizeDiagonal to width and height.
Money and math
Percentage CalculatorFind a percent of a number.
Discount CalculatorSale price and savings.
VAT CalculatorAdd or remove VAT.
Salary to HourlyAnnual to hourly estimate.
Compound InterestSavings growth estimate.
Tip SplitterSplit bill and tip.
Savings GoalMonths to a target.
Coffee BudgetDaily habit cost.
Subscription CostMonthly and yearly stack.
Double DiscountTwo discounts in sequence.
Allowance SplitSave, give and spend split.
Daily Savings StreakDaily amount over time.
Investment and crypto
Investment ROI CalculatorNet gain and return percentage.
CAGR CalculatorAnnualized growth rate.
Rule of 72 CalculatorQuick doubling-time estimate.
Dividend Yield CalculatorAnnual dividend divided by price.
Average Cost CalculatorTotal spent divided by units.
Crypto Profit CalculatorProfit or loss after fees.
Crypto Market Cap CalculatorPrice times circulating supply.
Crypto Staking CalculatorSimple APR reward estimate.
Crypto Position Size CalculatorRisk-based units and notional value.
Home and bills
Mortgage Payment CalculatorPrincipal, interest, tax and insurance estimate.
Rent vs Buy Monthly CostRent compared with ownership costs.
Electricity CostWatts, hours, kWh and cost.
Appliance Running CostDaily, monthly and yearly appliance cost.
Paint NeededRoom size, coats and coverage.
Download TimeFile size and speed into waiting time.
Moving CostTruck, fuel, boxes and labor.
Work and income
Health and fitness
Student tools
Grade CalculatorPoints into percentage.
Final Exam Score NeededTarget course grade math.
GPA CalculatorCredits and grade points.
Study PlannerItems across study days.
Reading TimeWords and speed into time.
Word CounterWords, characters and sentences.
Citation StarterDraft citation parts in one line.
Creator and web tools
Character CounterCharacters with and without spaces.
Hashtag CounterCount and deduplicate hashtags.
YouTube Timestamp GeneratorTimestamp labels for videos.
Aspect Ratio CalculatorProportional resize math.
Image Resize CalculatorScale dimensions and pixels.
Color Contrast CheckerWCAG-style contrast ratio.
URL Encoder and DecoderEncode or decode URL components.
JSON FormatterFormat JSON or show parse errors.