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Clean, private calculators for money, health, math, text and code. No sign-ups, no clutter — results update as you type.
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Fraction
Math · Add, subtract, multiply or divide two fractions and get the simplified answer, mixed number and decimal.
Auto Loan
Finance · Estimate your monthly car payment including sales tax, fees, down payment and trade-in value.
Coast FIRE
FIRE · See whether you have saved enough to stop investing and still retire on time, and when you will reach Coast FIRE.
BMI
Health · Calculate your body mass index and see which weight category it falls into.
A/B Test Significance
Statistics · Compare conversion rates of two variants and find out whether the difference is statistically significant.
Concrete
Construction · Work out how many cubic yards of concrete — or how many 40, 60 or 80 lb bags — you need for a slab, footing or round column.
Length Converter
Conversion · Convert between meters, centimeters, millimeters, kilometers, inches, feet, yards and miles.
Age
Everyday life · Find your exact age in years, months and days, plus total days lived and a countdown to your next birthday.
Running Pace
Sports · Work out your running pace per mile and per kilometre, and your average speed, from distance and time.
Case Converter
Text · Convert text to UPPER, lower, Title or Sentence case, or to camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
Base64 Encode & Decode
Developer · Encode text to Base64 or decode Base64 back to text, with full UTF-8 and URL-safe Base64 support.
Final Grade
Other · Find the score you need on your final exam to reach a target grade in the class.
Logarithm
Math · Calculate the logarithm of a number in any base, plus the natural log (ln), log₁₀ and log₂.
Compound Interest
Finance · See how savings grow with compound interest and regular monthly contributions, at any compounding frequency.
FIRE
FIRE · Find the age you can reach financial independence and retire early, based on what you earn, spend and have already invested.
Body Fat
Health · Estimate your body fat percentage from a few tape-measure readings using the U.S. Navy method.
Confidence Interval
Statistics · Build a confidence interval for a mean from the sample mean, standard deviation and sample size, using z or t.
Square Footage
Construction · Find the area of a room or lot in square feet or square meters for rectangles, circles, triangles and trapezoids, with optional cost.