Math for the everyday-everything.
Ages and dates, pet years, travel budgets, reading time, solar savings, clothing sizes, time zones — the calculators that come up between meetings and the weekend.
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All 103 daily life calculators, A-Z
Filter by name, or open a topic to see what's inside. Every tool in this category is listed here.
Clothing · 8
Entertainment · 12
Hobbies · 20
Home & Energy · 12
Pets · 31
Tech & Tools · 6
Time & Date · 10
Hand-picked starters.
Ages, dates, and pet years.
Age calculator, date duration, time zones, plus the pet-age conversions and feeding math for your dog or cat.
Age Calculator
Drag the birth year. Years lived + months + days since last birthday update live.
Dog Age Calculator
Updated 2019 UCSD epigenetic formula — far more accurate than "1 dog year = 7 human years."
~52 human yrs7-year-old medium dogSolar, energy, and household costs.
Solar savings, LED swaps, laundry energy, pool chemistry, moving costs, and the renovation math before you sign a contract.
Solar Savings
Drag monthly kWh and electric rate. Annual savings, lifetime savings, and CO₂ avoided update live.
LED Savings Calculator
Switch incandescent / CFL to LED — annual electricity savings and replacement-cost payback.
~$10/bulb/yrvs 60W incandescentBigger than one calculator? Follow the flow.
Multi-step paths that string the right daily life tools together in the order most people actually use them — with your numbers carried from step to step.
Books, shows, weddings, vacations.
Reading time, marathon TV planning, audiobook speed, wedding budget, travel costs, jet lag — every leisure-time math you'd Google.
Standard audiobook narration pace — the speed tool shows the hours you save at 1.5×.
Reading Time
Drag book pages and your reading speed. Total hours, days at 30 min/day, and audiobook hours update live.
Travel Budget Calculator
Daily budget by destination — flights, hotels, food, activities — built into a per-day spend estimate.
~$150/dayU.S. mid-tierData, bandwidth, and password math.
Data unit conversion (B → TB), bandwidth and download-time math, password crack-time estimates, and everyday speed checks.
Data Unit Converter
Drag a byte count. KB, MB, GB, TB (binary IEC) update live — and so does the equivalent download time on a 100 Mbps line.
Password Strength Checker
Entropy-based crack-time estimate — see how many centuries (or milliseconds) your password survives a brute-force attack.
12 chars ≈ centuriesmixed case + symbolsGolf, music, knitting, and clothing fit.
Golf handicap, BPM lookup, knitting yardage, plus international shoe / ring / bra / clothing size conversion.
Golf Handicap
Drag your score and the course rating. USGA-style handicap index + course-adjusted strokes update live.
Shoe Size Converter
Convert between US, UK, EU, JP, and CN shoe sizes for men, women, and kids.
US 10= UK 9 = EU 43Two good options? See the head-to-head.
The daily life vocabulary, decoded.
Every definition links to the calculator that puts the term to work. Browse the full glossary →
MPG = miles driven / gallons usedFill-up to fill-up fuel economy — the number every trip-cost and gas-vs-electric comparison starts from.Tip per person = bill × tip % / peopleThe restaurant split: total the gratuity first, then divide — rounding per person last keeps the math fair.Energy cost = watts × hours / 1,000 × rate per kWhWhat any appliance actually costs to run — the engine behind LED-swap, laundry, and solar-savings math.Frequently asked questions
Is the dog-age formula really "1 dog year = 7 human years"?
No — that's a myth. The updated 2019 UCSD epigenetic-clock formula gives a much more accurate conversion: human age ≈ 16 × ln(dog age) + 31. By that math, a 1-year-old dog is "biologically ~31"; a 7-year-old dog is ~52. The Dog Age calculator implements both formulas so you can compare.
Does Reading Time account for difficulty?
The widget assumes a single WPM rate, which works for general-fiction reading speed. Dense academic / technical reading is closer to 100–150 WPM; light fiction is closer to 300–400 WPM. The full Reading Time calculator lets you pick a difficulty multiplier or auto-detect from book genre.
Why does Solar Savings show such different numbers from quotes I get?
Vendor quotes typically include the 30% federal tax credit, state rebates, and sometimes net-metering credits — which makes the headline payback look shorter. The widget shows the pre-incentive savings; the full Solar Savings calculator lets you toggle incentives and shows both the gross and net payback period.
15 categories, one search box, zero signups. If it has a number, we calculate it.
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