A powerful calculator that handles numbers up to absolute infinity using BigInt arithmetic. Supports basic operations (+, -, ×, ÷), power, factorial, and displays results in scientific notation for extremely large numbers.
An interactive IQ test featuring pattern recognition, logical reasoning, math problems, and verbal analogies. Contains 15 questions with a timer. Results show estimated IQ score based on performance with category breakdown.
A comprehensive calorie calculator that calculates BMR (Basal Metabolic Rate) and TDEE (Total Daily Energy Expenditure) based on user inputs including weight, height, age, gender, and activity level. It uses the Mifflin-St Jeor equation for accurate results.
A comprehensive scientific calculator with trigonometric, logarithmic, and mathematical functions. Supports keyboard input and mouse clicks. Features include: basic operations, scientific functions (sin, cos, tan, log, ln, sqrt), constants (π, e), factorial, power, and percentage calculations.
A professional pricing calculator for blacksmiths to estimate project costs including labor, materials, overhead, and profit margins. Features include hourly rate calculation, material markup options, and detailed cost breakdowns.
A calculator that maps a bodybuilding competition prep timeline from start to show day. Takes current bodyweight, bodyfat percentage, and target show date as inputs, then calculates a structured timeline with Phase 1 (1% weekly fat loss), Phase 2 (0.5% weekly fat loss), and 2 weeks of peak/maintenance at the end. The timeline dynamically adjusts based on the selected show date.
A calculator for educational assessment that computes the Difficulty Index (P-value) and Discrimination Index (D) to evaluate test item quality. Enter either the basic statistics or use the upper/lower group method to assess how well each item differentiates between high and low performers.
A calculator that computes meeting duration and applies the 7-minute billing rule. The 7-minute rule rounds time worked to the nearest quarter hour: times less than 7 minutes are rounded down to 0, and times 7 minutes or more are rounded up to the next quarter hour (15 min).