Methodology

Immediate execution: a ⊕ b on next op or equals. Scientific: sin/cos/tan (DEG|RAD), asin/acos/atan, log₁₀, ln, x², x³, √, ∛, 1/x, n!, 10ˣ, eˣ, a^b, π, e; percent, ±, memory; invalid → Error

Use Basic mode for quick +, −, ×, ÷, percent, and memory keys. Tap Scientific to unlock sin, cos, tan, inverses, log, ln, powers, roots, factorial, π, and e. Angle functions respect DEG or RAD. Operations evaluate as you go — classic handheld style.

Net = amount paid − share of expenses; settlements greedily match debtors to creditors to minimize transfers

Add people (25 by default, up to 50 with higher limits), log each bill or expense with who paid and who shares it, then settle with the fewest transfers so everyone is even.

Volume = length × width × depth; cubic yards = cubic feet ÷ 27

Enter length, width, and depth. Volume = L × W × D. We show cubic feet, cubic yards (÷27), cubic metres, and approximate 80 lb bag count.

Difference: calendar span from start to end (years, months, days with borrowing). Add: shift start date by days, weeks, months, or years

Pick two dates to see the calendar span in years, months, days, and total days — or start from one date and add/subtract a duration.

Each die tumbles visually, then lands on 1 + floor(random × sides); total = sum of faces

Defaults to 1d6. Choose how many dice and sides, then tap Roll — dice tumble on the table and land showing pip (dot) faces with a running total.

MPG = miles ÷ gallons; L/100km = (litres ÷ km) × 100; km/L = km ÷ litres

Enter distance travelled and fuel consumed. Metric mode (default) shows L/100 km and km/L; switch to imperial for MPG — with cross-conversions either way.

GPA = Σ(grade × credits) ÷ Σ(credits)

Enter each course grade (typically 0–4) and credit hours. GPA = sum(grade × credits) ÷ sum(credits).

Final grade = Σ(score × weight) ÷ Σ(weight)

Add each assignment score (0–100) and its weight (%). Final grade = weighted average of all components.

Worked minutes = end − start − break (if end ≤ start, add 24h); decimal hours = minutes ÷ 60

Enter shift start and end in HH:MM, optionally deduct unpaid break minutes. Overnight shifts (end before start) count into the next day.

Network = IP AND mask; broadcast = network OR ~mask; usable hosts = 2^(32−prefix) − 2 (except /31–/32)

Enter an IPv4 address with prefix length (e.g. 10.0.0.0/8). We compute network and broadcast addresses, usable host range, subnet mask, and wildcard mask.

Random selection from enabled character pools (length L); strength from length and pool diversity

Choose length and character types. Passwords are generated locally in your browser using random selection from the enabled character pools.

% of = value × percent ÷ 100; what % = (part ÷ whole) × 100; change % = ((new − old) ÷ old) × 100

Choose a calculation type: percent of a number, what percent one value is of another, increase or decrease by a percent, or percent change between two amounts.

Human years from species/size chart: year 1 ≈ 15 human years for dogs; cats use accelerated early years then ~4 human years per cat year after year 2

Enter your pet's age in years and months. Cats and dogs use common veterinary chart factors — dog size (small, medium, large) adjusts the curve.

Result minutes = startHour×60 + startMin + addHours×60 + addMin; wrap modulo 24×60 with day offset

Set a start time (HH:MM) and enter hours and minutes to add or subtract. Results wrap past midnight and show any day offset.

Tip = bill × tip% ÷ 100; Total = bill + tip; Per person = total ÷ number of people

Enter the bill amount, pick a tip percentage (or drag the slider), and choose how many people split. We add the tip and show total and per-person amounts.