service 03 / js calculator
A pricing calculator
shaped to your logic.
I build a JS calculator wired to your actual business logic — the visitor picks services, compares tiers, sees the total update in real time. On submit, a full project summary lands in your Telegram or inbox. A working example is the calculator on this very site.
what it can compute
- Service pricing — "pick what you need" configurator with log-scale scope multiplier and urgency coefficient
- Tier plans — basic/pro/premium with dynamic savings highlight
- Loan / mortgage — amount, term, rate → monthly payment, total interest
- Materials estimator — area / volume → quantity + unit cost
- Shipping cost — weight × distance × shipping type
- Product configurator — option-pick with live price recalc and image assembly
what's included
- Brief — we map your pricing logic: rates, coefficients, add-ons
- Figma prototype — UX structure, logic verified before code
- Vanilla JS — no framework bloat, ~10-20 KB gzip
- Drop-in for any site: 1 line of JS + 1 line of CSS, or iframe
- Submission to a Telegram bot (you) and/or email
- Responsive design — works correctly on mobile
- Docs — how to change prices and coefficients without a developer
- 2 rounds of logic revisions after the demo
price and timeline
From $600 for a calculator with 3-6 steps and standard math. Delivery: 10-18 days. Complex configurators with 10+ parameters or WebGL visualization are scoped separately. Final scope is fixed in the service agreement.