Category 06 · Calculator

Fifteen answers. Zero of them stored.

Mortgage, BMI, EMI, percentage, age, salary, tax — the calculators you've kept in twelve open browser tabs, in one place. Every input is processed locally. No analytics on your numbers, no "save to your account", no log.

15
Calculators
3 groups
Finance · Health · Time
0 ms
Server latency
42
Currencies
Groups →
Finance · 7 Health · 2 Time & Date · 4 Math · 2
→ 15 total
Most-used · 38,200 / month

Mortgage Calculator that doesn't want your email.

Punch in price, deposit, rate, and term — get monthly payment, total interest, full amortization schedule, and a live chart. Tweak any field, the result updates in the same frame. Print to PDF locally if you need it for the bank.

  • Full amortization schedule with extra-payment scenarios
  • 42 currencies · fixed and variable-rate modes
  • Nothing leaves your tab — not even anonymized stats
Open mortgage calc
Monthly payment
€ 1,427.42
30 YR · 3.45%
Total interest
€ 193,872
Total paid
€ 513,872
15 calculators · grouped by purpose

Everything from mortgages to BMI.

All · 15 Finance Health Time Math
01 · Finance 7 calculators
01 / 15 ★ Top

Mortgage Calculator

Monthly payment, interest, amortization. Fixed or variable rate. 42 currencies.

Amortization 42 cur
Open 38.2K/mo
02 / 15

Loan Calculator

Monthly cost, total interest, payoff date. Compare two scenarios side by side.

A/B compare
Open 2 scenarios
03 / 15

EMI Calculator

Equated Monthly Installments. Adjust for prepayments, processing fees, and step-up plans.

Prepay Step-up
Open flexi
04 / 15

Interest Calculator

Simple and compound. Monthly, quarterly, annual compounding. Live chart of growth.

Simple Compound
Open 5 cadences
05 / 15

Payment Calculator

Amount needed to pay off debt by date, or time required at a given payment.

Reverse
Open both ways
06 / 15

Tax Calculator

VAT, sales tax, withholding. Per-country presets for EU, US, UK, AU, IN.

EU · US · UK
Open 21 presets
07 / 15

Salary Calculator

Convert between hourly, daily, weekly, monthly, annual. Net vs gross with deductions.

Net / Gross
Open 5 cadences
02 · Health 2 calculators
08 / 15 Trending

BMI Calculator

Body Mass Index in metric or imperial. WHO categories, healthy weight range, ideal range chart.

WHO m / ft
Open ▲ +48%
09 / 15

Calorie Calculator

Daily caloric need using Mifflin-St Jeor. Adjust for activity, goal, body composition.

Mifflin TDEE
Open TDEE
03 · Time & Date 4 calculators
10 / 15

Age Calculator

Exact age in years, months, days, hours. Next birthday countdown. Zodiac sign.

Y·M·D·h
Open live
11 / 15

Time Calculator

Add or subtract hours and minutes. Duration between two times across midnight or timezones.

+/− TZ aware
Open TZ aware
12 / 15

Date Calculator

Days between two dates. Add or subtract days, weeks, months, years from any date.

Business days
Open biz days
13 / 15

Day of the Week

What day of the week any date falls on. Birthdays, anniversaries, historical dates.

Gregorian
Open ±4000 yr
04 · Math 2 calculators
14 / 15

Percentage Calculator

Six common percentage operations in one panel: of, increase, decrease, ratio, change, reverse.

6 modes
Open 6 modes
15 / 15

Income Tax Calculator

Annual income tax across brackets. Deductions, credits, social security. EU and US tables.

EU · US Brackets
Open 2026 tables
k·

Your numbers stay on your laptop.

We don't profile you by what you're earning, paying back, weighing, or planning to refinance. The math runs in JavaScript on your machine — there's nowhere for the inputs to go.

38K
Mortgages / mo
0 ms
Server roundtrip
42
Currencies
Common questions

About numbers, privacy, and accuracy.

Do the calculators send my inputs anywhere?
No. Every calculation runs in JavaScript in your tab — there is no API endpoint to receive your salary, health metrics, or property valuation. We don't even send POST beacons for analytics on these pages. You can verify by opening the Network tab while you fill the form.
How accurate are the financial formulas?
We use standard textbook formulas — the same the bank uses for amortization (PMT/PV/RATE), the same the IRS uses for bracket-based tax, the same WHO uses for BMI ranges. We don't add "fudge factors". Two caveats: local fees and stamp duties are not included by default (you can add them), and tax brackets are updated annually from official sources.
Why is the mortgage calculator showing a different number than my bank?
Usually one of three reasons: (1) your bank quoted the rate as APR rather than nominal, (2) origination fees were added into the principal, (3) escrow for taxes / insurance is rolled into the monthly. Open the "Advanced" panel — there are fields for all three. The bare PMT formula matches IRR-derived bank quotes to the cent.
Are the tax tables updated for the current year?
Yes — we update the tax bracket tables each January for the current tax year, sourced from each country's official revenue agency. The version date is shown at the bottom of each calculator's results. We do not provide tax advice; for legally binding figures, consult a CPA / commercialista.
Can I save my inputs for next time?
Yes, optionally — there's a "Remember on this device" toggle that stores your last inputs in localStorage. The values never leave your browser. Turn it off and your inputs are forgotten as soon as the tab closes.
Local math · 0 uploads · 0 accounts

Numbers that stay yours.

Fifteen calculators. None of them want your salary, your weight, or your refinance plan in their database.

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Pure JavaScript No tracking 42 currencies