Calculators tools

An age calculator that counts whole calendar months, so it answers 34 years, 2 months, 5 days, then repeats the same span in months, weeks and days.

An APR calculator that folds up-front fees back into the rate. Borrow 25,000 at 7.5% over 60 months with a 500 origination fee and the true annual cost is 8.36%, on a payment of 500.95.

A bill splitter for one check or a whole trip: tip, tax, who paid what, and the shortest list of transfers that squares everyone up.

A BMI calculator that puts your reading on a 15-to-40 scale beside the WHO cut-offs, then works backwards to the weights that count as healthy at your height.

A calorie calculator built on Mifflin–St Jeor: your maintenance number, the BMR under it, and loss or gain targets at 250 and 500 kcal, plus a date if you name a goal weight.

Compound interest calculator for savings, an FD or an RD: future value, how much of that is interest, and a year-by-year schedule.

A date calculator for questions like what date is 90 days from today. Add or subtract days, weeks, months or years, and get the weekday with the answer.

Days between two dates, with the same span given in weeks, in years and months, and in business days once your own holidays come out.

A debt payoff calculator that runs snowball and avalanche month by month, then reports your debt-free date, the total interest, and the order your balances clear.

A grade calculator with four switchable modes: GPA on the 4.0 scale, CGPA to percentage, a weighted class grade, and what you still need on the final.

A mortgage calculator that adds up the whole payment: principal and interest, property tax, home insurance and PMI, with the month the insurance ends and a CSV of every month.

A loan EMI calculator: the monthly payment, the total interest sitting beside it, and every month of the schedule.

A percentage calculator that answers four questions on one page: X% of a number, X as a percent of Y, the increase or decrease between two figures, and what a price drops to after a discount.

Salary to hourly, or hourly back to salary: type one figure, mark which period it belongs to, and the other four fill themselves in.

An online scientific calculator you write expressions into instead of tapping key by key: trig in degrees or radians, logs, powers, factorials, and exact answers like 2/3 + 3/4 = 1 5/12.

A SIP calculator that splits the maturity figure into the money you paid in and the money it earned, with a year-by-year table under the chart.