Use the Tip tab. Enter the bill amount and choose your tip percentage — 15% is standard, 18–20% is good service, 25% is excellent. The calculator shows the tip amount, total bill, and per-person split instantly.
How do I calculate a monthly mortgage payment?
Use the Loan tab. Enter the loan amount, annual interest rate, and term in years. The formula is M = P[r(1+r)ⁿ] / [(1+r)ⁿ−1], where P is the principal, r is the monthly rate, and n is total payments. This calculator handles all the math automatically.
Can I use this scientific calculator for trigonometry?
Yes. The Scientific tab includes sin, cos, tan, log, log₂, √, |x|, and xʸ. Note that trig functions use radians by default. To convert degrees to radians, multiply by π/180.
How do I calculate percentage increase or decrease?
Use the Percentage tab → Percentage Change. Enter the starting and ending values. The formula is ((New − Old) ÷ |Old|) × 100. Positive = increase, negative = decrease. For six percentage modes, try the 67 Fresh Percentage Calculator.