Number tools for filling in planners
Use these for quick checks when a printable asks for a date, payment, running cost, grade, unit conversion or estimate. If you need somewhere to record the answer, start with one-page planners.
Start with the printable if you can
Use the tool, then write the result somewhere useful
For bills, trips, study plans, vehicle finance, health admin or home projects, the printable keeps the number beside the notes, source and next step.
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.
Unix Timestamp ConverterConvert Unix seconds to local time.
Sleep Cycle CalculatorEstimate a bedtime from wake time.
Day of the WeekFind the weekday for any date.
Time CalculatorsPlan deadlines, durations and date gaps.
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.
Unit Conversion GuideMeasurement conversion.
Science and Technical MathUse more practical science calculators.
Price Per Unit GuideCompare value with a practical shopping method.
Running PacePace and speed.
Road Trip FuelFuel use and cost.
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.
Monthly Budget WorksheetPlan wider spending instead of one-off bill splitting.
Emergency Fund CalculatorTarget months, gap and time to fund.
Bill Negotiation TrackerRecord renewal prices, call notes and next actions.
Monthly Bill Audit PlannerReview recurring costs, renewal dates, price rises and savings actions.
Discount vs Cashback GuideCompare discount decisions with better context.
Savings Goal CalculatorPlan a target, gap and monthly contribution.
Credit Card RepaymentPayoff time and interest estimate.
Bank Loan RepaymentMonthly payment and total interest.
Vehicle FinanceCompare HP, PCP and bank-loan style payments.
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.
Retirement Gap CalculatorTarget, contributions and growth gap.
Investment Fee DragLong-term effect of annual fees.
Debt Payoff StrategyAvalanche versus snowball comparison.
Mortgage OverpaymentInterest and time saved estimate.
Portfolio RebalancingTarget amounts and drift check.
Payback Period CalculatorSimple payback from cost and cash flow.
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.
Moving CostTruck, fuel, boxes and labor.
Home Project BudgetMaterials, labour, extras and contingency.
Work and income
Paycheck EstimatorGross pay to rough take-home pay.
Overtime PayRegular and overtime pay.
Time CardPaid hours after breaks.
Job Offer ComparisonSalary, benefits, commute and hours.
Freelance Hourly RateIncome target and billable hours.
Meeting CostAttendee time turned into money.
Invoice TotalSubtotal, discount, tax and total.Profit MarginGross profit, margin and markup.Markup CalculatorCost to selling price.Break-even CalculatorUnits and revenue to cover fixed costs.ROAS CalculatorRevenue per ad spend.CAC CalculatorAcquisition cost per customer.
Health and fitness
BMI CalculatorAdult BMI screening estimate.
Calorie NeedsBMR and maintenance estimate.
Protein TargetDaily protein from body weight.
Walking CaloriesMET-based walking estimate.
Hydration CalculatorSimple water target estimate.
Water Refill PlannerTurn a target into bottle refills.
Caffeine Intake CalculatorAdd caffeine across the day.
Sleep Debt CalculatorWeekly target versus actual sleep.
Waist-to-Height RatioScreening-style waist and height check.
Pregnancy Due DateCommon 280-day estimate.Target Heart Rate ZoneModerate and vigorous bpm ranges.Weekly Activity PlannerModerate-equivalent activity minutes.Sodium Intake CheckerCompare sodium with the FDA Daily Value.Added Sugar LimitAdded sugar grams from calories.Fiber TargetFiber target and gap estimate.