Seasonal calculators
Free calculators organized by the season you need them — back to school, holidays, summer, and more.
53 tools across 7 seasons
By season
Next up: Fall & Halloween — starts Oct 1, 2026
Back to school
Aug–SepBackpack Weight CalculatorSchool Supplies Budget CalculatorPercentage CalculatorFraction CalculatorWeighted GPA CalculatorAge CalculatorTime Converter: Seconds, Minutes, Hours, Days, WeeksStudy Time CalculatorReading Time CalculatorBook Challenge CalculatorHoliday season
Nov–DecGift Budget CalculatorTip CalculatorPercent Off CalculatorDiscount CalculatorBlack Friday Discount CalculatorThanksgiving CalculatorZero Waste Christmas Tree CalculatorTurkey Cooking Time CalculatorSales Tax CalculatorSummer
Jun–JulHeat Index CalculatorUV Exposure Level CalculatorHumidex CalculatorSolar Panel Angle CalculatorWater Demand CalculatorDew Point CalculatorSolar Panel Energy Scenario CalculatorDaylight Hours CalculatorSwimming Speed CalculatorPlant Watering Schedule CalculatorRainwater Harvesting CalculatorBBQ Party CalculatorNew year
JanCalorie Deficit Weight-Loss Timeline CalculatorTDEE CalculatorDaily Water Intake CalculatorIdeal Body Weight Calculator (Devine)VO2max Estimator (Cooper Test)Target Heart Rate CalculatorCalorie Deficit Scenario CalculatorBMI Calculator (Adult Body Mass Index)BMR CalculatorMacro CalculatorHabit Formation CalculatorTax season
Feb–AprCompound Interest CalculatorSavings Goal CalculatorSimple Savings CalculatorSavings Plan CalculatorFICA Tax CalculatorGross to Net CalculatorAdjusted Gross Income (AGI) CalculatorFrequently asked questions
- What does the seasonal calculator family cover?
- The seasonal hub organizes free calculators by the time of year they are most useful: back to school (supplies budgets, backpack weight, study and reading time), the holiday season (gift budgets, discounts, dinner and turkey planning), summer (heat index, UV exposure, water use), the new year (weight-loss timelines, fitness baselines), tax season (savings and income-tax estimates), fall and Halloween (party and dinner planning), and spring (plant watering, compost, rainwater).
- How are the seasons chosen?
- Each season is a band of months in the site's seasonal demand calendar: back to school runs August–September, the holiday season November–December, tax season February–April, and so on. The homepage shows whichever season matches today's month, while every season page remains available year-round.
- How are the calculators in each season selected?
- Every unit in a season is a real, listed calculator on the site, and its title and description come from that calculator page itself. The seasonal pages resolve units defensively: if a calculator page no longer exists, the unit is skipped rather than linked to a dead page.
- Are the seasonal calculators different from the regular ones?
- No. The seasonal pages are views of the same free calculators — each season links to the actual calculator pages, so the tools and their results are identical. The seasonal page just groups the calculators that tend to be useful at that time of year.