The whole purchase, worked through
01 / Buying · Guide
Buying a home.
Everything you need to know about mortgages, deposits, and the true cost of buying, with a calculator at every step.
7 chapters · 6 calculatorsRead the guide
Independent · ad-free · since 2024
Numbers for
real life.
Fast, focused calculators for the real numbers in a life: the mortgage, the overtime, the pace, the years. No ads, no popups, no tracking. Just the math, and the moment it lands.
COMPOUND GROWTH · LIVEdrag it
$609,985
$500/mo · 7.0%/yr · 30 yrs
today2056
Growth $429,985Deposits $180,000out-earns you in yr 11wait 5 yrs: −$204,950
$0
$500
7.0%
30 yr
Worth ×3.4 what you put inOpen full calc →
NO ADSNO TRACKERSNO POPUPSNO "SIGN UP TO SEE RESULTS"NO COOKIE BANNER (BEYOND THE LAW)NO PAYWALLNO NEWSLETTERS30 CALCULATORS · 0 NOISE
01 / Find by intentWhat are you
What are you
working out?
Most calculator sites sort by category. But calculators don't live in categories. They live in moments. Here's what people are actually trying to do.
Where your salary actually goes
02 / Earning · Guide
Take-home pay.
Follow your salary from gross to the money that actually lands. Tax, National Insurance or FICA, pension and state tax come off line by line on a payslip that builds as you scroll.
5 chapters · 1 calculatorsRead the guide
From first deposit to your last paycheck
03 / Growing · Guide
Retiring well.
Set a target pot, pick a tax wrapper and a blend of real index funds, subtract fees, then stress-test the income against the worst retirements on record.
8 chapters · 5 calculatorsRead the guide
From sign-up to the start line
04 / Racing · Guide
Train for your race.
Pick your 5K, 10K, half or marathon, see where your fitness stands, set a realistic goal, then build a periodized plan and nail your race-day pacing and fuel.
7 chapters · 4 calculatorsRead the guide
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- 30
- Calculators in the set. Each one made deliberately, not generated.
- 0
- Ad units, tracking pixels, or third-party analytics on results pages.
- 7.6M
- Calculations run in the last 12 months. All client-side, none stored.
- ~37ms
- Median time to first paint on a cold load. We measure ourselves.
03 / Why it exists
Read the full manifesto →The math, without the mess.
A simple question, like what's the monthly on this mortgage, shouldn't mean wading through ad walls, popups, and a login screen. Most calculators on the web are slow, bloated, and built to capture you instead of answer you.
Calcz is the opposite. A set of fast, single-purpose calculators that give the direct answer, then explain the math and the topic behind it. No account, no ads, no noise. Just the number, and enough context to trust it. Built around real-life decisions, not categories.
- 01No ads, ever
- 02No trackers
- 03No need to login
- 04Blazing fast
- 05The direct answer
- 06Explains the math
- 07Built for real life