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New & updated

Meaningful new calculators, rate changes, features and corrections — explained in plain language.

  1. Time zone converterNow starts with your browser’s local date, time and zone, plus London, Sydney and New York for immediate comparison.
  2. RAID capacity calculatorExpanded the calculator with a source-backed guide to RAID layouts, capacity terms, failure boundaries and backup planning.
  3. Time zone converterAdded a meeting-time planner for up to eight ordered zones, with an optional local-time shortcut and explicit daylight-saving gap and overlap handling.
  4. Electricity use & cost calculatorAdded device energy, tariff, standing-charge and period comparison calculations.
  5. Ohm's law & power calculatorAdded six two-value Ohm's-law and resistive-power solve modes with SI-prefix conversion.
  6. Series & parallel resistance calculatorAdded two-to-six resistor series and parallel equivalent-resistance calculations.
  7. Three-phase power calculatorAdded three balanced-system solve modes with explicit line values, power factor and efficiency separation.
  8. Voltage drop calculatorAdded manual-resistance voltage-drop estimates for explicit two-conductor DC and resistive single-phase paths.
  9. Age and birthday calculatorAdded exact calendar age, elapsed days, birth weekday and next-birthday calculations with an explicit leap-day rule.
  10. Average & weighted average calculatorAdded ordinary and weighted averages with row contributions.
  11. Date & duration calculatorAdded signed date differences, inclusive calendar and weekday counts, and calendar-day or weekday shifting.
  12. Discount & final price calculatorAdded sequential discounts, reverse calculation and optional post-discount tax.
  13. EV charging cost calculatorAdded charging energy, per-distance, trip and annual cost calculations for electric cars.
  14. EV vs petrol/diesel cost calculatorAdded a transparent EV versus petrol or diesel energy-cost comparison for trips and annual distance.
  15. Fuel economy & trip cost calculatorAdded unambiguous fuel-economy conversions and trip-cost estimates.
  16. Percentage calculatorAdded percentage-of, percentage share, directional change and symmetric difference calculations.
  17. Ratio calculatorAdded ratio simplification, proportional division and one-missing-value proportion solving.
  18. Speed, distance & time calculatorAdded unit-aware speed, distance and time calculations with optional pace display.
  19. Time calculatorAdded clock-time addition, subtraction and elapsed-time calculations with explicit overnight handling.
  20. Unit-price comparisonAdded like-for-like unit-price comparison for item counts, mass and liquid volume.
  21. Childcare cost calculatorAdded schedule-based childcare costs with user-entered sibling discounts and support.
  22. Household budget calculatorAdded recurring household income and spending reconciliation across weekly, fortnightly, monthly and annual periods.
  23. Loan repayment calculatorAdded fixed-rate repayment, extra-payment and annual amortization calculations.
  24. Backup storage & duration calculatorAdded backup storage & duration calculator with reproducible URL state, explicit units and reconciled results.
  25. Bandwidth-delay product calculatorAdded bandwidth-delay product calculator with reproducible URL state, explicit units and reconciled results.
  26. Data transfer & throughput calculatorAdded data transfer & throughput calculator with reproducible URL state, explicit units and reconciled results.
  27. Hash collision probability calculatorAdded hash collision probability calculator with reproducible URL state, explicit units and reconciled results.
  28. IP subnet calculatorAdded ip subnet calculator with reproducible URL state, explicit units and reconciled results.
  29. Log storage & retention calculatorAdded log storage & retention calculator with reproducible URL state, explicit units and reconciled results.
  30. PoE power budget calculatorAdded poe power budget calculator with reproducible URL state, explicit units and reconciled results.
  31. RAID capacity calculatorAdded raid capacity calculator with reproducible URL state, explicit units and reconciled results.
  32. Uptime & SLA downtime calculatorAdded uptime & sla downtime calculator with reproducible URL state, explicit units and reconciled results.
  33. VLSM subnet plannerAdded vlsm subnet planner with reproducible URL state, explicit units and reconciled results.
  34. Emergency fund calculatorAdded a user-defined reserve target, funding gap and saving-period estimate.
  35. Investment fee comparison calculatorAdded side-by-side investment fee scenarios and modeled drag.
  36. Investment growth calculatorAdded contribution timing, fee drag, inflation adjustment and annual projection calculations.
  37. Overtime pay calculatorAdded the gross-pay equivalent rate over ordinary hours alongside the average across all hours worked.
  38. Portfolio rebalancing calculatorExpanded current-to-target allocation and buy/sell arithmetic to support larger portfolios.
  39. Savings goal calculatorAdded contribution and time-to-target solving with timing-aware projections.
  40. Withdrawal runway calculatorAdded bounded drawdown modeling with withdrawal timing and inflation.
  41. Kanban sizing calculatorAdded simple-loop Kanban container sizing with an explicit safety buffer and conservative whole-container rounding.
  42. MTBF, MTTR & availability calculatorAdded observed MTBF, MTTR, failure rate and an inherent-availability estimate from entered operating and active repair times.
  43. OEE calculatorAdded OEE, loss-factor and productive-time calculations from production data.
  44. Process capability (Cp & Cpk) calculatorAdded Cp, Cpk and one-sided capability calculations from supplied process summary statistics.
  45. Takt time & cycle time calculatorAdded demand-driven takt, cycle comparison, pace gap and mathematical capacity.
  46. Yield, FPY & scrap calculatorAdded reconciled First Pass Yield, final yield, rework and scrap calculations.
  47. Break-even calculatorAdded break-even units, required revenue and target-profit calculations.
  48. Contractor rate calculatorAdded contractor day- and hourly-rate estimates using income, costs and billable time.
  49. Contribution margin calculatorAdded contribution per unit, total contribution and contribution-ratio calculations.
  50. Income tax calculator — AustraliaAdded detailed 2026–27 income-tax and Medicare levy working, including the full-year exemption option.
  51. Income tax calculator — United KingdomAdded 2026–27 income-tax estimates for England, Wales, Northern Ireland and Scotland.
  52. Income tax calculator — United StatesAdded 2026 federal income-tax estimates for supported filing statuses and deductions.
  53. Overtime pay calculatorAdded gross overtime pay with up to three named rates and a clear entitlement warning.
  54. Pay raise calculatorAdded daily pay comparisons with an adjustable working-days-per-week assumption.
  55. Pay raise calculatorAdded percentage, fixed-amount and target-pay comparisons across common pay periods.
  56. Profit margin & markup calculatorAdded margin, markup and target-price calculations with every step shown.
  57. Salary converterAdded gross-pay conversion across six periods with editable working hours, days and weeks.