予算【よさん】
estimate (of costs), budget
決算【けっさん】
settlement of accounts, closing accounts, financial results, reporting (of accounts)
計算【けいさん】
calculation, reckoning, count, forecast
公算【こうさん】
probability, likelihood
概算【がいさん】
approximation, rough estimate, ballpark figure
清算【せいさん】
(financial) settlement, squaring accounts, clearing debts, liquidation, ending (a relationship), breaking up (with), burying (the past), redeeming (one's faults)
採算【さいさん】
profit
換算【かんさん】
conversion (e.g. yen to dollars), change, exchange, translation (numerical)
誤算【ごさん】
miscalculation
算数【さんすう】
arithmetic, calculation
精算【せいさん】
exact calculation, squaring of accounts, adjustment
珠算【しゅざん】
calculation on an abacus
足し算【たしざん】
addition
成算【せいさん】
hope of success, prospects of success
暗算【あんざん】
mental arithmetic