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A practical lane for date, finance, health, time, and network helpers that do not fit cleanly into the other families.
Add or subtract date
Add or subtract date moves a starting date by days, weeks, months, or years and reports the result clearly.
Calendar
Calendar gives you a clean month grid with ISO week numbers and weekday labels.
City clock
City clock shows the current local time across a short list of common world cities.
Daylight saving time calculator
Daylight saving time calculator shows whether a zone observes DST and when the next transitions land.
Days between calculator
Days between calculator reports the gap between two dates in days, weeks, months, and years.
Meeting planner
Meeting planner maps one date and time across several cities so cross-zone meetings are easier to place.
Moon phase calculator
Moon phase calculator estimates the moon phase, illumination, and age for a chosen date.
Sunrise calculator
Sunrise calculator estimates sunrise, sunset, dawn, dusk, and solar noon from a date and coordinates.
Time difference calculator
Time difference calculator shows the offset between two time zones for the same moment.
Time since calculator
Time since calculator turns a past or future date into an elapsed-time breakdown.
Men’s 3-site body fat
Men’s 3-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s 4-site body fat
Men’s 4-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s 7-site body fat
Men’s 7-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s Durnin & Womersley body fat
Men’s Durnin & Womersley body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s girth body fat
Men’s girth body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s Parillo body fat
Men’s Parillo body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s Sloan body fat
Men’s Sloan body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Men’s Yuhasz body fat
Men’s Yuhasz body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s 3-site body fat
Women’s 3-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s 4-site body fat
Women’s 4-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s 7-site body fat
Women’s 7-site body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s Durnin & Womersley body fat
Women’s Durnin & Womersley body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s girth body fat
Women’s girth body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s Parillo body fat
Women’s Parillo body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s Sloan body fat
Women’s Sloan body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
Women’s Yuhasz body fat
Women’s Yuhasz body fat estimates body fat from the measurement set associated with that method and returns the derived percent plus a short classification note.
BMI calculator
BMI calculator converts height and weight into body-mass index and a standard category label.
Pregnancy baby weight calculator
Pregnancy baby weight calculator gives a rough fetal-weight estimate by gestational week using a simple milestone table.
Pregnancy due date calculator
Pregnancy due date calculator uses the last menstrual period or conception date to estimate an expected due date.
Baby allergy risk
Baby allergy risk gives a simple inherited-risk estimate based on family allergy history.
Baby blood type
Baby blood type lists the likely ABO and Rh outcomes from the parents’ blood groups.
Fertile days calculator
Fertile days calculator estimates an ovulation day and fertile window from cycle timing.
Type of body calculator
Type of body calculator uses height and wrist size to estimate a small, medium, or large body frame.
Proper weight calculator
Proper weight calculator estimates an ideal-weight range from height and sex using a classic simple formula.
Waist to hip ratio calculator
Waist to hip ratio calculator converts waist and hip measurements into the WHR value and a simple risk label.
Speed to tempo
Speed to tempo converts travel speed and distance per beat into beats per minute.
IP calculator
IP calculator turns an IPv4 CIDR block into network, broadcast, mask, and host-range details.
Domain existence checker
Domain existence checker checks whether a public DNS record resolves for the domain name you enter.
Timestamp to date
Timestamp to date converts Unix seconds or milliseconds into readable local and UTC times.
CPI inflation calculator
CPI inflation calculator applies an annual inflation rate to show how purchasing power changes over time.
Investment calculator
Investment calculator models compounding growth with an optional monthly contribution.
Investment inflation calculator
Investment inflation calculator shows nominal growth and an inflation-adjusted real result side by side.
Adjustable rate mortgage calculator
Adjustable rate mortgage calculator estimates payments during an intro period and after the first reset.
Fixed rate mortgage calculator
Fixed rate mortgage calculator returns the standard monthly payment along with total interest and total paid.
ARM vs FRM calculator
ARM vs FRM calculator lines up a simple adjustable mortgage against a fixed one so you can see where they diverge.
FX currency options calculator
FX currency options calculator uses a Black-Scholes style model with domestic and foreign rates.
Index options calculator
Index options calculator prices a basic European-style index option from the standard inputs.
Stock options calculator
Stock options calculator prices a simple European stock option with an optional dividend yield.