Math, finance & health, instantly
38 free calculators for everyday math, loans, investing, and fitness. No signup — everything runs in your browser.
Percentage Calculator
Find X% of Y, what percent X is of Y, or percent change between two values.
Discount & Tax Calculator
Calculate final price after discounts and sales tax or VAT with a full breakdown.
Tip & Split Bill Calculator
Calculate tip, grand total, and per-person share with preset tip percentages.
Margin & Markup Calculator
Calculate gross margin, markup percentage, and profit from cost and selling price.
Ratio & Proportion Calculator
Solve proportions A:B = C:D or simplify ratios to lowest terms.
Fraction ↔ Decimal ↔ % Converter
Convert between fractions, decimals, and percentages with live sync.
GPA Calculator
Calculate term and cumulative GPA from course credits and letter grades on a 4.0 scale.
Grade Calculator
Find what score you need on the final exam or remaining points to hit a target grade.
Unit Price Calculator
Compare pack prices by unit cost and see which option is the best value.
Average Calculator
Find the mean of a list of numbers, with optional weights, plus median and mode.
Random Number Generator
Generate one or many random integers or decimals in a range, with an optional unique list.
Aspect Ratio Calculator
Simplify width and height to lowest terms, or scale a ratio to a target side.
Loan EMI & Amortization Calculator
Compute equal periodic loan payments and a full principal vs. interest amortization schedule.
Debt Payoff & Extra Payment Calculator
See how extra payments reduce total interest and shorten your loan payoff term.
EAR / APR Converter
Convert nominal stated interest rates to effective annual rate based on compounding frequency.
Compound Interest Calculator
Model balance growth with customizable compounding intervals and optional periodic contributions.
SIP / Recurring Deposit Calculator
Calculate future value of regular identical periodic contributions (SIP or RD).
Rule of 72 Calculator
Estimate doubling time for investments using the Rule of 72 or exact formula.
CAGR Calculator
Calculate compound annual growth rate between an initial and final investment value.
PV & FV Solver (TVM)
Solve for any one unknown among N, I/Y, PV, PMT, and FV in time value of money problems.
Inflation & Purchasing Power Calculator
Compute how inflation erodes purchasing power and the future value equivalent of today's money.
Net Worth / Balance Sheet Calculator
Calculate net worth as total assets minus total liabilities with a simple balance sheet.
Savings Goal / Target Corpus Calculator
Determine the periodic contribution needed to reach a financial target by a set date.
BMI Calculator
Calculate body mass index from height and weight with WHO category.
Calorie Calculator
Estimate daily calorie needs (TDEE) from BMR and activity level.
Body Fat Calculator
Estimate body fat percentage with the US Navy circumference method.
BMR Calculator
Calculate basal metabolic rate with Mifflin–St Jeor and Harris–Benedict.
Ideal Weight Calculator
Compare Hamwi, Devine, Robinson, and Miller ideal-weight formulas.
Pace Calculator
Convert distance and time into running pace and speed.
Army Body Fat Calculator
Estimate body fat with the DoD / AR 600-9 tape test and age-based max.
Lean Body Mass Calculator
Estimate lean body mass with Boer, James, and Hume formulas.
Healthy Weight Calculator
Find the WHO BMI 18.5–24.9 weight range for your height.
Calories Burned Calculator
Estimate calories burned from MET, body weight, and duration.
One Rep Max Calculator
Estimate 1RM from weight and reps using Epley, Brzycki, and Lombardi.
Target Heart Rate Calculator
Find training zones from Tanaka HRmax and optional Karvonen resting HR.
Macro Calculator
Split daily calories into protein, carbs, and fat for cut, maintain, or bulk.
Water Intake Calculator
Estimate daily water needs from body weight plus activity.
Waist-Hip Ratio Calculator
Calculate waist-to-hip ratio and WHO-style risk category by sex.