Author profile
James Blanckenberg
Founder, BusCalcTools
I started BusCalcTools after watching too many small business owners make pricing decisions on bad maths. The 50% markup ≠ 50% margin mistake alone costs UK and US small firms an estimated five-figure sum per year — multiplied across millions of businesses, that's a lot of profit left on the table.
The site exists for one job: give business owners a calculator that loads in under two seconds, runs entirely in the browser, switches between US, UK, and South Africa tax rules automatically, and tells you what your numbers actually mean instead of just spitting out a percentage.
I previously built FinnCalc — a sister site covering personal-finance calculators — using the same philosophy. Both projects are fully independent: no client work, no investors, no agenda beyond making the maths accessible.
If a calculator on this site has produced a result that contradicts your accountant, your accountant is probably right — the calculators are designed as a fast sanity check, not professional advice. Sources for tax rates and benchmark figures are linked on each calculator page.
Areas of expertise
James writes and maintains every calculator and article across these four topic clusters on BusCalcTools:
Editorial responsibilities
- Calculator logic.Every formula is hand-written, cross-checked against standard accounting and finance textbook definitions, and disclosed in the “See the formula” accordion on each calculator page.
- Source verification. Tax rates, loan benchmarks, and employer-cost percentages come from primary government publications (IRS, HMRC, SARS) and reputable industry data. Sources are listed and dated on each calculator page.
- Reviews and updates. Tax rates are reviewed at least once every 12 months and immediately following any official rate change. Articles are reviewed annually.
- Corrections. Every substantive correction is tracked publicly on the changelog. Report errors via the corrections policy.
Editorial review
BusCalcToolsis currently a single-author publication. Calculators and articles ship with an “Editorial review by” byline that reflects the same author until a credentialed reviewer (CFP, CPA, or CA(SA)) is recruited. Until then the site is candid about the limits of single-author review: calculators are educational tools, not professional advice. Always consult a qualified accountant or financial adviser for material decisions.
Other sites
James also runs FinnCalc, a sister site covering personal-finance calculators (retirement, mortgage, take-home pay, investing) across the US, UK, and South Africa.
Online identity
Contact
Email [email protected] for corrections, source enquiries, or media requests. See the editorial policy for the full standards we hold every page to.