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Project your military leave balance with the exact 2.5-days-per-month rule and DoD partial-month accrual bands, then catch use-or-lose days before September 30.
Compare terminal leave with selling back military leave: the 60-day career cap, a withholding preview, leave accrual through your separation date, and split plans.
Estimate Australia Post letter and parcel postage: letter size checks, cubic weight, band pricing, box-size comparison, and a price-versus-weight chart.
Estimate FiO2 by oxygen device and flow, then compute the ROX index, S/F and P/F ratios, alveolar PAO2, A-a gradient, oxygen content, and O2 cylinder runtime.
Calculate employee turnover rate from start headcount, end headcount, and separations. Includes formula, example, and tips to interpret results.
Estimate approximate sunlight exposure time for vitamin D production using skin type, UV index, and body area exposed. Includes formula details, examples, safety notes, and an optional mini-game.
Tetration calculator with fractional heights, super-root and super-log inverse modes, animated convergence plots, and the infinite power tower limit curve.
Compare LED, CFL, and incandescent bulbs by lumens, watts, color temperature, annual energy cost, and 10-year replacement savings.
Estimate how many full charges a power bank can provide for your phone, tablet, or other device using mAh, voltage, and efficiency. Includes formula, worked examples, assumptions, travel notes, and an optional mini-game.
NEC Table 300.5 minimum burial depth for direct burial cable, PVC, and rigid conduit by location — plus trench dig depth, excavation volume, and a cover diagram.
Determine the total voltage, capacity, and energy of a custom battery pack by entering cell specifications and series/parallel counts.
Calculate hyper-operations from addition to pentation. Explore power towers, growth notes, and symbolic output when numbers grow beyond direct computation.
Size a septic leach field from design flow and percolation rate: absorption area, trench length, lateral layout, reserve area, tank size, and material cost.
Compute how much pesticide concentrate and water to mix for a desired spray volume and concentration. Avoid guesswork and keep applications precise.
Convert carbon dioxide, methane, and nitrous oxide masses into total CO₂ equivalent using 100-year global warming potentials, with a clear formula, worked example, interpretation guide, and an optional CO₂e sorting mini-game.
Estimate how much it costs to charge an e-bike battery per full charge and over a typical month. Enter battery capacity, electricity rate, and charger efficiency to see usable energy, wall energy, and charging cost.
Estimate how much each load of laundry costs. Enter washer, dryer, water, detergent, and electricity details to see your per-load laundry expenses.
Calculate the rough opening for interior and exterior doors from slab size, jamb/installation allowances, and common framing clearances.
Estimate your true car cost per mile using annual fuel, maintenance and repairs, insurance, depreciation, and miles driven. Includes formula, worked examples, practical assumptions, and an optional route-efficiency mini-game.
Validate a 17-character Vehicle Identification Number (VIN) by recomputing the ISO 3779 check digit (9th character). Includes the formula, weights, transliteration table, and a worked example.
Estimate the comfort of an airplane seat based on pitch, passenger height, and recline. Plan flights with more legroom.
Convert MCAT raw scores to scaled section scores and percentiles with the official 2026-2027 AAMC table, plus a score-goal planner and practice-test history.
Calculate the length of historical eras in years, including periods that cross from BCE to CE. Enter a start year and end year to find how many years an empire, dynasty, or era lasted, with the no-year-zero adjustment applied automatically.
Estimate shelving requirements from book counts, average thickness, and shelf dimensions.
Estimate a client's net settlement after contingency attorney fees, reimbursed case costs, liens, and gross-versus-net fee-base choices. Includes formulas, examples, and planning cautions.
Estimate a potential wrongful termination settlement value using back pay, front pay, lost benefits, emotional distress, punitive or statutory damages, and attorney fees. Includes formulas, assumptions, a worked example, and an optional settlement-sorting mini-game.
Use this passport validity calculator to check whether your passport stays valid long enough for six-month, three-month, Schengen, UK, Canada, and duration-of-stay travel rules.
Use this Song Length Calculator to convert BPM, bars, and beats per measure into song duration in minutes and seconds. Helpful for producers, songwriters, DJs, composers, and set-list planning.
Instantly calculate Scrabble word scores with support for double/triple letter and word multipliers. Uses standard English tile values, shows a worked exampl...
Estimate your golf handicap index using your average score, course rating, and slope rating. Learn how handicaps let players of all skill levels compete fairly.