Calculators that show their working
Twenty free tools for loans, investments, tax and health. No account, no limits, and every result comes with the formula that produced it.
Most used
The three people reach for first.
EMI calculator
Monthly payment on any loan, plus the full amortisation schedule and a 15-vs-30-year comparison.
Compound interest
See how a balance grows year by year, and what changing the compounding frequency actually does.
BMI calculator
Your body mass index on a colour-coded scale, with an honest account of where BMI misleads.
Finance
Loans, investments, pricing and tax.
EMI calculator
Monthly loan payment and amortisation schedule.
Compound interest
Growth of a balance over time.
Mortgage calculator
Home loan payment with tax and insurance.
SIP calculator
Returns on a monthly investment plan.
Salary calculator
Gross pay to take-home, broken down.
GST calculator
Add or strip tax from any amount.
ROI calculator
Return on investment, annualised.
Profit margin
Gross and net margin from revenue and cost.
Discount calculator
Sale price and what you save.
Percentage calculator
Three percentage questions, one page.
Tip calculator
Tip, total and the split per person.
Break-even point
Units you must sell to cover costs.
Health
Screening estimates with plain-English interpretation. Not medical advice.
BMI calculator
Body mass index on a colour-coded scale.
Calorie calculator
BMR, TDEE and a macro split.
Age calculator
Exact age in years, months and days.
Water intake
Daily target for your weight and climate.
Sleep calculator
Bedtimes that land between cycles.
Body fat percentage
US Navy method estimate.
Ideal weight
Healthy range across four formulas.
Due date calculator
Estimated due date and current week.
Why these are different
No signup, ever
Nothing is stored on a server. Every calculation runs in your browser.
Results you can share
Your numbers live in the link, so it opens filled in for whoever you send it to.
The maths is visible
Open the working panel to see the formula with your own figures filled in.
Built for a phone
Number keypads, thumb-sized controls and a result that stays on screen while you adjust.