One job at a time
Each tool gets its own focused page instead of hiding every kind of math behind modes and nested menus.
Math tools that
get to the point.
Every calculator here is made for one clear job, with familiar controls and plain-English answers. No account. No spreadsheet detour.
Available now
Pick a calculator.
26 calculators are live.
Live
RunSplit Running Pace Calculator
Calculate running pace, finish time, distance, race predictions, and cumulative mile or kilometer splits.
Pace + time · Race splits · Print card Plan your pace →Live
BodyRange BMI Calculator
Calculate adult BMI, see a healthy weight reference range for your height, and compare quick weight scenarios.
US + metric · Weight range · Private Check your range →Live
Job Offer Comparator
Compare salary, bonus, benefits, paid time off, commute cost, commute time, and personal fit in one clear view.
Total compensation · Commute cost · Relative score Compare job offers →Live
Classic Calculator
Handle everyday arithmetic, percentages, and quick keyboard calculations in a familiar layout.
+ − × ÷ · Percentages · Keyboard Open calculator →Live
U.S. Mortgage Calculator
Estimate a U.S. monthly mortgage payment with taxes, insurance, HOA dues, PMI, and an annual amortization schedule.
Monthly payment · Escrow costs · Amortization Open calculator →Live
U.S. Auto Loan Calculator
Estimate a U.S. car payment in all 50 states and D.C. with tax, fees, trade equity, old-loan payoff, APR, and term.
50 states + D.C. · Trade equity · Total interest Open calculator →Live
Period Calculator
Estimate your next period, fertile window, ovulation date, and six upcoming cycles without saving personal dates.
Private dates · Three-month calendar · Result PNG Open calculator →
Nothing matched that wording.
Try “calculator,” “mortgage,” or “percentage.”
A calculator should feel obvious.
Works where you are
Buttons are sized for a phone, common keyboard shortcuts work on a computer, and no account gets between you and the answer.
Honest limits
Every calculator explains what it does. Specialized financial, tax, medical, or engineering decisions still deserve specialized tools.