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).
A calculator to estimate D0 subscription value by computing D0 unsubscribe rate, D0 subscription ratio, and payment rate. Compare two scenarios (A vs B) using the formula: D0 Subscription Ratio × (1 - D0 Unsubscribe Rate) × Payment Rate.
A calculator that estimates Total Energy Expenditure (TEE) to maintain current weight in overweight girls aged 3-18 years. Uses the formula: TEE = [389 - (41.2 × age) + PAL × (15 × weight (kg) + 701.6 × height (m)] with inputs for age, height, weight, and physical activity level. PAL values: Sedentary=1.0, Low Active=1.18, Active=1.35, Very Active=1.6
A calculator for estimating Total Energy Expenditure (TEE) to maintain current weight in overweight boys aged 3-18 years. Uses the formula: TEE = [114 - (50.9 × age) + PAL × (19.5 × weight + 1161.4 × height (meters)]. Inputs: Age (3-18 years), Height (cm), Weight (kg). Output: Daily calorie needs in kcal for weight maintenance.